Research activity information

• Cenozoic evolution of the Great Arc of the Caribbean and Lesser Antilles slabs: A perspective from a 3D numerical subduction model

  Andrés David, Bayona Ordóñez, Vlad Constantin Manea, Shoichi Yoshioka

  Elsevier BV, Aug. 2025, Tectonophysics, 911, 230849 - 230849

  [Refereed]

  Scientific journal


• Rheological segmentation of the Cocos slab and its relation with the 2017 Mw8.2 Tehuantepec earthquake

  Marina Manea, Vlad Constantin Manea, Shoichi Yoshioka, Erika Jessenia Moreno, Nobuaki Suenaga

  Tectonic plates bend and deform when approaching a subduction zone, creating intense faulting and highly variable stress and strain fields across short distances inside the slab. In September 2017, a large M_w8.2 intraplate normal fault occurred in southern Mexico, with an epicentral area located within a seismic gap where no megathrust had struck in more than a century. Despite the relatively young and hot Cocos plate, this seismic episode ruptured almost the entire slab below the brittle–ductile transition zone that normally limits the depth extent of such events. Here, we present a high-resolution thermomechanical model of spontaneous subduction for this area, where bending-induced brittle and ductile deformation and grain plate damage are considered. Modeling results show that the 2017 M_w8.2 Tehuantepec normal fault earthquake occurred due to the reactivation of one of the outer-rise-formed abyssal faults. In addition, the hypocenter was located in a stable, hydrated region of the lithospheric mantle at the transition limit between the elastic and ductile regimes. We found that earthquake rupture orientation is consistent with a region where a clear localized shear band of reduced effective viscosity is predicted. We propose that the rupture of this large intraslab event propagated in the ductile portion of the slab initially by a transformational faulting process, followed by a thermal runaway mechanism at greater depths and higher temperature.

  Frontiers Media SA, Jul. 2025, Frontiers in Earth Science, 13

  [Refereed]

  Scientific journal


• Mantle flows driving tectonic escape around eastern Himalaya syntaxis

  Rui Qu, Ye Zhu, Yingfeng Ji, Lijun Liu, Weiling Zhu, Chaodi Xie, Haris Faheem, Shoichi Yoshioka

  Springer Science and Business Media LLC, Apr. 2025, Scientific Reports, 15(1) (1)

  [Refereed]

  Scientific journal


• 2D visco-elasto-plastic subduction models in the presence of a high density and viscosity continental block: a case study for the slab geometry beneath the Kii Peninsula, southwest Japan

  Erika Jessenia Moreno, Shoichi Yoshioka, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga

  Abstract The Philippine Sea (PHS) plate embracing the Shikoku Basin subducts with a relatively young age varying between ~ 15 and 26 Ma. It exhibits a diversity of subduction styles along the Nankai Trough, from shallow beneath Shikoku and Chugoku regions to steep subduction beneath the Kii Peninsula. Although the onset of subduction along the entire Nankai Trough is synchronous at 15 Ma, present-day subduction geometries differ greatly between Shikoku and the Kii Peninsula. Seismic tomography beneath the Kii Peninsula reveals several high-velocity zones associated with the presence of a high density block. Some studies suggest that the location of this high density block coincides with the acidic rock group represented by the Kumano pluton, which is probably responsible for the high dip angle subduction of the Philippine Sea (PHS) slab beneath the Kii Peninsula. This study analyzes the effect of a high density and viscosity block placed in the vicinity of the Nankai Trough beneath the Kii Peninsula on the subduction dynamics of the PHS slab. We develop a series of 2D subduction numerical models using a visco-elasto-plastic rheology with spontaneous slab bending where we incorporate a high density and viscosity block in the proximity of the convergent margin. Our numerical results are compared with seismic tomography, present-day slab geometry, and seismicity distribution along an across-arc profile passing through the Kii Peninsula. The results show a good relationship between the slab geometry dynamics and high density and viscosity materials localized near the subduction zone. The high density and also possible high viscosity block identified in seismic tomography may hamper subduction of the PHS plate with a low dip angle beneath the Kii Peninsula, resulting in steep subduction.

  Springer Science and Business Media LLC, Apr. 2025, Progress in Earth and Planetary Science, 12(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Spatiotemporal changes in the strain field in the Niigata–Kobe Tectonic Zone: long-term analysis using GNSS time series data

  Hiroki Kawabata, Shoichi Yoshioka

  Abstract We analyzed the spatiotemporal changes in the displacement and strain fields in the Niigata–Kobe tectonic zone (NKTZ), central Japan, with temporal resolutions of one and 3 years, respectively, using Global Navigation Satellite System (GNSS) time series data provided by the Geospatial Information Authority of Japan (GSI) over a long period of time from 1997 to 2022. We also attempted to extract steady-state variations without assuming linearity, which have never been obtained. The results show that the contraction rates of the dilatation rate, maximum shear strain rate and principal strain rate when postseismic deformations associated with large earthquakes were removed were consistently greater in the northern part of the NKTZ than in the central and southern parts of the NKTZ, reaching a maximum absolute value of 5.1 × 10^–6 of contraction in the accumulated dilatation and an accumulated maximum shear strain of 3.0 × 10^–6 for the 26 year period except for the years 2011 and 2012. These results are considered to result from the continuous expression of the elastic deformation of the thick sedimentary layer in the Echigo Plain and the viscous deformation of the lower crust, in addition to the effects of subduction of the oceanic Pacific plate. For the maximum shear strain, the central part of the NKTZ also has relatively large values, which may be caused by lateral deformation due to creep along the Atotsugawa and Ushikubi Fault Zones. Unlike before the Mw 9.0 2011 Tohoku-Oki earthquake, after the event, the dilatation rate was lower in the east‒west direction, and the variation in the dilatation rate appeared to return to the preearthquake dilatation rates both in terms of the spatial patterns and amplitudes over time within several years. The short-wavelength component of the dilatation rate in the east‒west direction in the northern part of the NKTZ shows that the spatial variations in the dilatation rate were similar before and after the 2011 Tohoku-Oki earthquake at 37.0° N, indicating continuous contraction. However, at 37.5° N, the spatial distribution of the dilatation rate changed from before to after the occurrence of the earthquake, and the characteristic large contractions that were identified before the earthquake were not observed after the event. Furthermore, Mj 4.0 or greater earthquakes were relatively uniformly distributed in the southern and central parts of the NKTZ. On the other hand, in the northern part of the NKTZ, there was a seismic gap, especially in areas with high strain concentrations in the Echigo Plain, where only large deformations could be caused by the low elasticity in the thick sedimentary layer. These results might indicate that a large earthquake will occur in the seismic gap in the future. In addition, a relatively large number of past major destructive earthquakes have occurred in the northern part of the NKTZ. In this area, since the Eastern Margin Fault Zone of the Takada Plain has a relatively high probability of an earthquake occurring in the next 30 years, additional detailed investigations of this area are needed.

  Springer Science and Business Media LLC, Mar. 2025, Progress in Earth and Planetary Science, 12(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Three-dimensional thermomechanical modelling beneath Guerrero, Mexico, and its relation to the occurrence of interplate seismic phenomena

  Nobuaki Suenaga, Shoichi Yoshioka, Vlad Constantin Manea, Marina Manea, Erika Jessenia Moreno, Yingfeng Ji

  Springer Science and Business Media LLC, Mar. 2025, Scientific Reports, 15(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Subduction thermal state, slab metamorphism, and seismicity in the Makran subduction zone

  Haris Faheem, YingFeng Ji, WeiLing Zhu, Rui Qu, Ye Zhu, Shoichi Yoshioka

  Earth and Planetary Physics, 2025, Earth and Planetary Physics, 9(2) (2), 266 - 278

  [Refereed]

  Scientific journal


• Effects of hot plumes and slab rheology on the bending of the Philippine Sea slab at shallow depths beneath the Kyushu region, southwest Japan

  Natsuki Kozai, Nobuaki Suenaga, Shoichi Yoshioka, Vlad Constantin Manea

  Abstract The Philippine Sea (PHS) plate is currently subducting beneath the Kyushu region in southwestern Japan and exhibits a steep dip angle at depths of approximately 70–100 km. It has been suggested that the increase in the dip angle may be attributed to a hot plume, which was purportedly present in the northwestern part of Kyushu approximately 10–6 Ma, flowing southeastward toward southern Kyushu and causing steep shallow bending of the PHS plate. Using numerical simulations, this study quantitatively evaluates the impact of an upwelling hot plume from the northwestern part of Kyushu on the abrupt bending of the PHS plate at shallow depths. We use a time-dependent two-dimensional thermal convection model that incorporates the subduction history of the PHS plate along a vertical plane passing through a hot plume from northwestern Kyushu to the Nankai Trough. Numerical simulations were conducted to investigate the behavior of a slab when colliding with an upwelling hot plume, considering different values of slab viscosity. The results demonstrate that when a hot plume impacts a slab with a viscosity lower than that of a normal strong slab, the bending of the slab is reproduced at a depth of approximately 100 km, which is consistent with the observed PHS slab bending at depths of 70–100 km.

  Springer Science and Business Media LLC, Dec. 2024, Pure and Applied Geophysics, 182(4) (4), 1861 - 1888

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Finite element software for calculating fluid flow and heat transport for seamounts

  V.C. Manea, E.G. Sewell, M. Manea, S. Yoshioka, N. Suenaga, E.J. Moreno

  Elsevier BV, Aug. 2024, Environmental Modelling & Software, 179, 106129 - 106129

  [Refereed]

  Scientific journal


• Detection of a recent large Hyuga-nada long-term slow slip event and estimation of its spatiotemporal slip distributions

  Hiroki Kawabata, Yukinari Seshimo, Shoichi Yoshioka, Francisco Ortega-Culaciati

  Abstract Using horizontal and vertical GNSS time series data from the GSI in sotheastern Kyushu from January 1, 2017 to June 30, 2022, we detected a recent long-term slow slip event (L-SSE) that occurred in the Hyuga-nada region, southwest Japan, and estimated its spatiotemporal slip distribution. We performed such analysis considering the piecewise evolution of slip over time with time windows of 0.8 years to ensure a good signal-to-noise ratio in the horizontal displacements in each time window. The results showed that a slip of more than 2 cm occurred in the central part of Miyazaki Prefecture from 2018.5 to 2019.3 (the units were 0.1 years = 36.5 days). Then, the amount of slip increased and expanded slightly to the southern part of Miyazaki Prefecture from 2019.3 to 2020.1, and the amount of slip reached a maximum of 3.9 cm in the subsequent period (2020.1–2020.9). A smaller slip occurred at almost the same location in the following 0.8 years. Therefore, the duration of the L-SSE was approximately 3.2 years from approximately 2018.5 to 2021.7. The annual average maximum slip rate was approximately 4.9 cm/yr (3.9 cm/0.8 yr) during the period from 2020.1 to 2020.9. The maximum total slip was estimated to be approximately 12.9 cm, and the equivalent release moment was 4.9 × 10¹⁹ Nm, corresponding to Mw7.1. Compared to previous L-SSEs that occurred in the Hyuga-nada region, the annual average maximum slip rate was relatively low, and the main total slip was estimated at almost the same location on the plate interface. On the other hand, the slip duration of this L-SSE was the longest, and the release moment and moment magnitude were the greatest. The total slip area of more than approximately 10 cm in the Hyuga-nada L-SSE estimated in this study almost overlapped with the afterslip area of the December 3, 1996 Hyuga-nada earthquake, with a depth range of approximately 30–40 km. Short-term SSEs also occurred in the same depth range. These coincidental same depth ranges of interplate seismic events stem from large thermal gradients. The large thermal gradients play an important role in narrowing the depth range of frictional parameters (a–b) at the plate interface. In addition, the pore pressure and normal stress are closely related to the critical stiffness. In particular, contrasting values of pore pressure and normal stress at the shallow and deep sides of the mantle wedge corner may also contribute to transient aseismic slip within the same depth range.

  Springer Science and Business Media LLC, Apr. 2024, Progress in Earth and Planetary Science, 11(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 3D thermal structural and dehydration modeling in the southern Chile subduction zone and its relationship to interplate earthquakes and the volcanic chain

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati

  Abstract In southern Chile, the Nazca plate is subducting beneath the South American plate. This region was struck by megathrust earthquakes in 1960 and 2010 and is characterized by the existence of a volcanic chain. In this region, we modeled a three-dimensional thermal structure associated with the subduction of the Nazca plate by using numerical simulations. Based on the obtained temperature distribution, we determined the updip and downdip limit temperatures for the region ruptured by these two megathrust earthquakes. In addition, the distributions of water content and dehydration gradient were calculated by using appropriate phase diagrams and compared with the location of the volcanic chain. As a result, we infer that the coseismic slip of the 2010 Mw8.8 Maule earthquake occurred only at temperatures lower than and around the 350 °C isotherm that resembles the beginning of the brittle‒ductile transition. We also deduce that the rupture of the 1960 Mw9.5 Valdivia earthquake propagated up to the 450 °C isotherm because the magnitude was considerably large and the young hot plate subducted near the Chile Ridge. In addition, the hydrous minerals in the turbidites, MORB and ultramafic rocks released fluids via dehydration reactions, and dehydrated water migrated upward almost vertically, decreasing the melting point of the mantle wedge and contributing to the formation of the volcanic chain.

  Springer Science and Business Media LLC, Jan. 2024, Geoscience Letters, 11(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Spatiotemporal slip distribution associated with the 2012–2016 Tokai long-term slow slip event inverted from GNSS data

  Yukinari Seshimo, Hiroki Kawabata, Shoichi Yoshioka, Francisco Ortega-Culaciati

  Abstract We used Global Navigation Satellite System (GNSS) time series data to estimate the spatiotemporal slip distribution for a long-term slow slip event (L-SSE) that occurred in the Tokai region, central Japan, from 2012 to 2016. Since all the used GNSS data were affected by the postseismic deformation associated with the 2011 Mw9.0 Tohoku-Oki earthquake, we removed such postseismic signal from the time series of three components at each of the stations. The minimal time window for an inversion analysis was set to 0.5 years (6 months), taking into account the signal-to-noise ratio of displacements for each time window. In the horizontal displacement fields, displacements were observed in the south‒southeast and southeast directions on the west and east sides of Lake Hamana, respectively, with temporal changes in their amounts and directions. In the vertical displacement fields, uplift was observed on the east side of Lake Hamana. From these data, we estimated the L-SSE initiated in approximately 2012.5 and ended by 2017.0, indicating the duration time is 4.5 years and the duration was much longer than that obtained in a previous study. Using these data, we performed the inversion analysis, in which three a priori information were assumed, i.e., the spatial distribution of slip is smooth, slip mainly occurs in the direction of plate convergence, and the temporal variation in the slip is smooth, to obtain the spatiotemporal slip distribution on a plate boundary with 3-D geometry. As a result, we identified that the L-SSE consisted of two subevents. The first subevent initiated on the southwest side of Lake Hamana and expanded during the period from 2013.0 to 2014.5. The maximum slip velocity during the period from 2012.5 to 2017.0 was estimated to be approximately 3.5 cm/year there for 2013.5–2014.0. The second subevent took place on the west side of Lake Hamana gradually from 2015.0 to 2015.5, continued, and expanded from 2015.5 to 2016.5. From the cumulative slip distribution, we found that its shape spread in the dip direction and obtained a maximum slip of approximately 10.6 cm, a moment release of 2.7 × 10¹⁹ Nm, and an equivalent moment magnitude of 6.9. Comparing our results with the L-SSE that occurred in the Tokai region between 2000 and 2005, we found that the slip initiation location was almost the same, but the subsequent slip location was more southerly for the 2012–2016 Tokai L-SSE. Additionally, the maximum slip velocity and moment magnitude were smaller for the 2012–2016 L-SSE.

  Springer Science and Business Media LLC, Dec. 2023, Geoscience Letters, 10(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• The geodynamic origin of Los Humeros volcanic field in Mexico: insights from numerical simulations

  A. Bayona, V. C. Manea, M. Manea, S. Yoshioka, E. Moreno, N. Suenaga

  Abstract Compared to normal arc-related volcanic eruptions, the formation of a volcanic caldera is a relatively atypical event. During caldera formation a series of large volumes of magma are erupted, reducing the structural support for the rock above the magma chamber and creating a large depression at the surface called caldera. Los Humeros volcanic field (LHVF) represents one of the largest volcanic calderas in Mexico. It is located some 400 km from the trench at the eastern edge of the Trans Mexican Volcanic Belt where the depth to the Cocos slab is more than 300 km. In this study we employ high-resolution two-dimensional thermomechanical numerical simulations of magma intrusions and a horizontal tectonic strain rate to better understand the influence of crustal deformation for the formation of Los Humeros caldera. A minimum number of three thermal anomaly pulses of hydrated mantle material (with diameter of 15 km or more) and a regional strain rate of 7.927 × 10^–16 s⁻¹ are required for magma to reach the surface. Modeling results show that regional extension coupled with deep thermal anomalies (with a temperature excess of ΔT ≥ 100 °C) that come in a specific chain-type sequence produce surface deformation patterns similar to LHVF. We propose an asthenospheric sub-slab deep source (> 300 km depth) for the thermal anomalies where previous studies showed the existence of a gap or tear in the Cocos slab.

  Springer Science and Business Media LLC, Dec. 2023, Scientific Reports, 13(1) (1)

  [Refereed]

  Scientific journal


• Heterogeneous slab thermal dehydration driving warm subduction zone earthquakes

  Ye Zhu, Yingfeng Ji, Lijun Liu, Weiling Zhu, Rui Qu, Chaodi Xie, Haris Faheem, Shoichi Yoshioka, Lin Ding

  Abstract Changing thermal regime is one of the key mechanisms driving seismogenic behaviors at cold megathrusts, but it is difficult to interpret warm subduction zones such as Vanuatu for the temperatures are higher than that accommodates shallow brittle failures. We construct a 3-D thermomechanical model to clarify the thermal structure that controls tectonic seismicity in Vanuatu and predict a warm circumstance associated with abundant seismicity. Results reveal a heterogeneous slab ranging from 300 °C to over 900 °C from the Moho to subvolcanic depth. The subduction seismicity corresponds well to the plate interface where dynamic thermal dehydration is focused. The transformation from hydrated basalts to eclogites along the slab facilitates the occurrence of intense earthquakes and slips. Multistage mineralogical metamorphism affects the dynamic stability of megathrusts and favors the generation of active interplate large events. Therefore, slab thermal dehydration plays a greater role than slab temperature condition in influencing the subduction earthquake distribution in warm subduction systems.

  Springer Science and Business Media LLC, Nov. 2023, Scientific Reports, 13(1) (1)

  [Refereed]

  Scientific journal


• Fast relocking and afterslip-seismicity evolution following the 2015 Mw 8.3 Illapel earthquake in Chile

  Joaquín Hormazábal, Marcos Moreno, Francisco Ortega-Culaciati, Juan Carlos Báez, Carlos Peña, Christian Sippl, Diego González-Vidal, Javier Ruiz, Sabrina Metzger, Shoichi Yoshioka

  Abstract Large subduction earthquakes induce complex postseismic deformation, primarily driven by afterslip and viscoelastic relaxation, in addition to interplate relocking processes. However, these signals are intricately intertwined, posing challenges in determining the timing and nature of relocking. Here, we use six years of continuous GNSS measurements (2015–2021) to study the spatiotemporal evolution of afterslip, seismicity and locking after the 2015 Illapel earthquake ($$M_w$$ 8.3). Afterslip is inverted from postseismic displacements corrected for nonlinear viscoelastic relaxation modeled using a power-law rheology, and the distribution of locking is obtained from the linear trend of GNSS stations. Our results show that afterslip is mainly concentrated in two zones surrounding the region of largest coseismic slip. The accumulated afterslip (corresponding to $$M_w$$ 7.8) exceeds 1.5 m, with aftershocks mainly occurring at the boundaries of the afterslip patches. Our results reveal that the region experiencing the largest coseismic slip undergoes rapid relocking, exhibiting the behavior of a persistent velocity weakening asperity, with no observed aftershocks or afterslip within this region during the observed period. The rapid relocking of this asperity may explain the almost regular recurrence time of earthquakes in this region, as similar events occurred in 1880 and 1943.

  Springer Science and Business Media LLC, Nov. 2023, Scientific Reports, 13(1) (1)

  [Refereed]

  Scientific journal


• Numerical modeling of subduction and evaluation of Philippine Sea Plate tectonic history along the Nankai Trough

  E. J. Moreno, V. C. Manea, M. Manea, S. Yoshioka, N. Suenaga, A. Bayona

  Abstract The subduction of the Philippine Sea (PHS) plate along the Nankai Trough in in southwest Japan is a relatively recent process compared with subduction along the Japan Trench in northeast Japan. However, the tectonic evolution of the PHS plate along the Nankai Trough is still controversial and not fully understood. There are several competing hypotheses based on different estimates for the time variations of convergence rate and plate age. Our study employs numerical modelling of subduction in order to evaluate the slab evolution for the last 15 Myr and aims to evaluate each tectonic scenario against the present-day slab geometry along a profile passing through the Shikoku and Chugoku regions. The modelling strategy involves a parameter study where subduction initiation and various subduction parameters are analyzed in terms of subduction geometry evolution. Two-dimensional visco-elasto-plastic numerical simulations of spontaneous bending subduction predict that convergence rate and plate age variations play an important role in the evolution of subduction geometry. Modeling results after 15 Myr of evolution reveal that the tectonic model based on a high convergence rate between ~ 15 Ma and ~ 3 Ma produces a slab geometry that agrees well with the observed present-day slab shape specific for the Shikoku and Chugoku regions.

  Springer Science and Business Media LLC, Oct. 2023, Scientific Reports, 13(1) (1)

  [Refereed]

  Scientific journal


• Variation in the thermal and dehydration regime below Central America: Insights for the seismogenic plate interface

  Rui Qu, Yingfeng Ji, Lijun Liu, Weiling Zhu, Ye Zhu, Chaodi Xie, Shoichi Yoshioka, Haris Faheem, Lin Ding

  Elsevier BV, Oct. 2023, iScience, 26(10) (10), 107936 - 107936

  [Refereed]

  Scientific journal


• 3-D thermal structure and dehydration near the Chile Triple Junction and its relation to slab window, tectonic tremors, and volcanoes

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati, Matthew Miller, Javier Ruiz

  Abstract The southern Chile subduction zone is a complex tectonic environment, where the Chile Ridge, the Nazca (NZ) and Antarctic (AN) plates subduct underneath the South American (SA) plate. The intersection between the NZ, AN and SA plates is referred to as the Chile Triple Junction (CTJ). In this region, a gap, often referred to as a slab window, has been formed between the NZ and AN slabs due to the divergence in their plate motion velocities, with volcanoes existing mainly above the subducted NZ and AN plates. In this study, we constructed a three-dimensional thermomechanical model associated with simultaneous subduction of the NZ and AN plates near the CTJ. The results show that the current temperature distributions on the upper surface of the slabs are higher closer to the Chile Ridge, and the AN plate has a distribution of elevated temperatures relative to the NZ plate at the same depth due to the northward migration of the CTJ and the slower convergence rate of the AN plate. Moreover, we calculated the water content and dehydration gradient from the temperature distribution near the upper surface of the slab and discussed their relationship to the distribution of volcanoes. In the northern part of the model domain, high dehydration gradients were obtained below the volcanic chain. Therefore, we suggest that the water released from the slab and the mantle wedge decreased the melting point of the mantle wedge just above the slab and produced melts, which may have contributed to form the overlying volcanoes.

  Springer Science and Business Media LLC, Jul. 2023, Geoscience Letters, 10(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Relationship between strain accumulation and release associated with recent slow slip events on the Japanese Islands

  Hiroki Kawabata, Shoichi Yoshioka, Francisco Ortega-Culaciati

  Abstract In this study, we investigated the relationship between the strain accumulation before a slow slip event (SSE) and the strain release during the SSE for three recent SSEs along the Suruga Trough, Sagami Trough, and Nankai Trough, which are subduction zones in central to southwest Japan. The three analysed SSEs were the 2013–2016 Tokai long-term SSE (L-SSE), the 2018 Boso-Oki short-term SSE (S-SSE), and the 2019–2021 Central Shikoku L-SSE. We applied exponential and logarithmic functions to remove the postseismic deformations caused by the Mw 9.0 2011 Tohoku-Oki earthquake. We discovered a strong negative correlation between strain accumulation and strain release in the dilatation of all three SSEs and in the maximum shear strain of the 2018 Boso-Oki S-SSE. A comparison of the amount of strain accumulation with that of strain release revealed that approximately 30% of the strain was released in the 2013–2016 Tokai L-SSE, that 40% of the strain was released in the 2019–2021 Central Shikoku L-SSE, and that approximately 60% of the strain was released in the 2018 Boso-Oki S-SSE. This finding suggests that all of the accumulated strains are not necessarily released by the SSEs.

  Springer Science and Business Media LLC, Jun. 2023, Progress in Earth and Planetary Science, 10(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Deep subduction of the Philippine Sea slab and formation of slab window beneath central Japan

  Kazuki Miyazaki, Junichi Nakajima, Nobuaki Suenaga, Shoichi Yoshioka

  Abstract The geometry of the Philippine Sea slab (PHS) subducting beneath the Japanese islands has been imaged to 400 km depth beneath the Kyushu and Chugoku regions, whereas the PHS slab geometry beneath the Hokuriku region has only been determined to ~ 140 km depth, thereby indicating a large east–west asymmetry in the slab subduction. However, geologic evidence suggests that there was symmetrical east–west seafloor spreading along the axis of the Kinan seamount chain when the Shikoku basin was an active spreading center in the PHS plate. This inconsistency suggests that the PHS slab should be present beneath the Hokuriku region. Here we perform P-wave travel-time tomography across central Japan and conduct a two-dimensional plate subduction numerical simulation that reproduces the dual subduction of the PHS and Pacific (PAC) plates to elucidate the PHS slab geometry beneath central Japan. The tomography results reveal a high-velocity anomaly at ~ 150–250 km depth that extends from Wakasa bay to Noto peninsula and a slab window beneath the Hokuriku region. The numerical simulation results suggest that the PHS slab may have torn when it collided with the PAC slab, with the once leading edge of the PHS slab now present along the upper surface of the PAC slab beneath Noto peninsula. These results indicate that the PHS slab exists at ~ 250 km depth beneath the Hokuriku region, although it has been torn owing to its collision with the PAC slab, with this tear propagating westward to form a triangular slab window beneath the Hokuriku region. Graphical Abstract

  Springer Science and Business Media LLC, May 2023, Earth, Planets and Space, 75(1) (1)

  [Refereed]

  Scientific journal


• Strain accumulation and release associated with the occurrence of SSEs in the subduction zones of the Japanese Islands

  Hiroki Kawabata, Shoichi Yoshioka

  Jan. 2023, scientific reports, 13, 1379, English

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Spatiotemporal distributions of afterslip and locking on the plate interface associated with the 2011 Tohoku-Oki earthquake using a 3-D temperature and strain rate-dependent heterogeneous viscosity model

  Nobuaki Suenaga , Yuval A. Banay, Shoichi Yoshioka , Keisuke Sato, Momo Tanaka and Yingfeng Ji

  Jan. 2023, Physics of the Earth and Planetary Interiors, 334, 106971, English

  [Refereed]


• Temperature distribution for interplate seismic events in the southcentral Alaska subduction zone based on 3-D thermomechanical modeling

  Kaya Iwamoto, Nobuaki Suenaga and Shoichi Yoshioka

  Nov. 2022, Tectonophysics, 843, 229604, English

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Bayesian Multi-Model Estimation of Fault Slip Distribution for Slow Slip Events in Southwest Japan: Effects of Prior Constraints and Uncertain Underground Structure

  Ryoichiro Agata, Ryoko Nakata, Amato Kasahara, Yuji Yagi, Yukinari Seshimo, Shoichi Yoshioka and Takeshi Iinuma

  Abstract We consider a Bayesian multi‐model fault slip estimation (BMMFSE), which incorporates many candidates of the underground structure (Earth structure and plate boundary geometry) model characterized by a prior probability density function (PDF). The technique is used to study long‐term slow slip events (L‐SSEs) that occurred beneath the Bungo Channel, southwest Japan, in around 2010 and 2018. We here focus on the two advantages of BMMFSE: First, it allows for estimating slip distribution without introducing relatively strong prior information such as smoothing constraints, by combining a fully Bayesian inference and better consideration of model uncertainty to avoid overfitting. Second, the posterior PDF for the underground structure is also obtained during the fault slip estimation, which can be used as priors for the estimation of slip distribution for recurring events. The estimated slip distribution obtained using BMMFSE agreed better with the distribution of deep tectonic tremors at the down‐dip side of the main rupture area than those based on stronger prior constraints when the corresponding Coulomb failure stress changes are compared. This finding suggests a mechanical relationship between the L‐SSE and the synchronized tremors. The use of the posterior PDF of the underground structure estimated for the 2010 L‐SSE as prior PDF for the 2018 event resulted in more consistent estimation with the data, indicated by a smaller value of an information criterion.

  American Geophysical Union (AGU), Aug. 2022, Journal of Geophysical Research: Solid Earth, 127(8) (8), e2021JB023712, English

  [Refereed]

  Scientific journal


• Spatiotemporal distributions of interplate coupling in Tohoku, northeast Japan, for 14 years prior to the 2011 Tohoku-oki earthquake inverted from GNSS data

  Daiki Abe, Shoichi Yoshioka

  Jul. 2022, Tectonophysics, 838, 229479, English

  [Refereed]


• Spatiotemporal Changes in Fault Displacements Associated with Seismovolcanic Events in and Around Miyakejima and Kozushima in 2000 Inferred from GNSS Data

  Takahiro Akiyama, Hiroki Kawabata and Shoichi Yoshioka

  Jul. 2022, Pure and Applied Geophysics, 179, 4245 - 4265, English

  [Refereed]


• Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka

  Abstract The Alaska subduction zone is characterized by a subducting oceanic plateau, which is referred to as the Yakutat terrane. Tectonic tremors occur in this zone, and there are few volcanoes above the subducted Yakutat terrane. In this study, we performed a 3-D numerical simulation of a thermal structure associated with the simultaneous subduction of the Yakutat terrane and Pacific plate to elucidate the mechanism of tectonic tremors, which typically involve the presence of water. We calculated the water content distribution near the slab surface by using the thermal structure obtained from our simulation and phase diagrams of the hydrous minerals included in the slab. As a result, dehydration from the marine sedimentary layer and oceanic crust was observed near the area where tectonic tremors occurred. Tectonic tremors occur only in the Yakutat terrane because the marine sedimentary layer and oceanic crust are thicker there, and the total amount of water content in these layers is higher; therefore, the amount of dehydration is also higher there than in the Pacific plate. Additionally, there are few volcanoes above the subducted Yakutat terrane because little water remains within the slab beneath the volcanic chain where magma is produced.

  Springer Science and Business Media LLC, Apr. 2022, Scientific Reports, 12(1) (1), 6234

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Exploring the location of large earthquakes using fault stress accumulation—A case study upon MW9.0 Tohoku-Oki earthquake in Japan

  Xie ZhouMin, CaiYongEn, Shoichi Yoshioka, Daiki Abe

  Jan. 2022, Chinese Journal of Geophysics (in Chinese), 65(1) (1), 1 - 11

  [Refereed]

  Scientific journal


• Spatiotemporal slip distributions associated with the 2018–2019 Bungo Channel long-term slow slip event inverted from GNSS data

  Yukinari Seshimo, Shoichi Yoshioka

  Abstract Long-term slow slip events (L-SSEs) have repeatedly occurred beneath the Bungo Channel in southwestern Japan with durations of several months to a couple of years, with a recurrence interval of approximately 6 years. We estimated the spatiotemporal slip distributions of the 2018–2019 Bungo Channel L-SSE by inverting processed GNSS time series data. This event was divided into two subevents, with the first on the southwest side of the Bungo Channel from 2018.3 to 2018.7 and the second beneath the Bungo Channel from 2018.8 to 2019.4. Tectonic tremors became active on the downdip side of the L-SSE occurrence region when large slow slips took place beneath the Bungo Channel. Compared with the previous Bungo Channel L-SSEs, this spatiotemporal slip pattern and amount were similar to those of the 2002–2004 L-SSE. However, the slip expanded in the northeast and southwest directions in the latter half of the second subevent. The maximum amount of slip, the maximum slip velocity, the total released seismic moment, and the moment magnitude of the 2018–2019 L-SSE were estimated to be 28 cm, 54 cm/year, $$4.4 \times 10^{19}$$ Nm, and 7.0, respectively, all of which were the largest among the 1996–1998, 2002–2004, 2009–2011, and 2018–2019 L-SSEs.

  Springer Science and Business Media LLC, Jan. 2022, Scientific Reports, 12(1) (1), 343

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Thermal regime and slab dehydration beneath the Izu‐Bonin arc: Implications for fast and slow subduction earthquakes

  Weiling Zhu, Yingfeng Ji, Rui Qu, Chaodi Xie, Shoichi Yoshioka, Deng Zeng

  Wiley, Nov. 2021, Terra Nova, 34(2) (2), 103 - 112

  [Refereed]

  Scientific journal


• Drilling into the Mantle: A Key to Prognosticating the Future of the Ocean Planet

  Yoshiyuki TATSUMI, Nobuaki SUENAGA, Shoichi YOSHIOKA, Katsuya KANEKO

  Water circulation, along with plate subduction, is considered based on the stabilities of hydrous phases and pressure–temperature profiles of the sinking oceanic plate. Water in a rather hot slab like the present one may be largely liberated at shallow depths (< 150 km) and return to the ocean via. arc magmatism. On the other hand, stabilization of dense hydrous minerals under cooler conditions, which current subduction zones will soon experience, causes the transportation or reflux of seawater to the deep mantle, which reduces the total mass of surface seawater. Simple calculations accepting water contents in the subducting slab suggested by a recent seismic velocity structure model indicate that the Earth's oceans are likely to disappear ∼80 million years hence. Significant changes may happen such as the end of plate tectonics and the onset of snowball Earth, with associated catastrophes affecting life. The only way to confirm this picture of the future of the ocean planet Earth is to examine deep hydration taking place along the outer rise through direct analyses of the upper mantle across the Moho.

  Tokyo Geographical Society, Aug. 2021, Journal of Geography (Chigaku Zasshi), 130(4) (4), 585 - 597, Japanese

  [Refereed]

  Scientific journal


• 3-D thermal regime and dehydration processes around the regions of slow earthquakes along the Ryukyu Trench.

  Nobuaki Suenaga, Shoichi Yoshioka, Yingfeng Ji

  Several interplate seismic events, such as short-term slow slip events (S-SSEs) and low-frequency earthquakes (LFEs), have been identified in the Ryukyu Trench, southwestern Japan. As one of the specific characteristics of this seismicity, the depths at which S-SSEs occur at the plate interface beneath Okinawa Island are approximately 5-10 km shallower than those beneath the Yaeyama Islands. To elucidate the cause of this difference in depth, we constructed a three-dimensional, Cartesian thermomechanical subduction model and applied the subduction history of the Philippine Sea (PHS) plate in the model region. As a result, the interplate temperatures at which S-SSEs take place were estimated to range from 350 to 450 °C beneath Okinawa Island and from 500 to 600 °C beneath the Yaeyama Islands. The former temperature range is consistent with previous thermal modelling studies for the occurrence of slow earthquakes, but the latter temperature range is by approximately 150 °C higher than the former. Therefore, explaining how the depth difference in S-SSEs could be caused from the aspect of only the thermal regime is difficult. Using phase diagrams for hydrous minerals in the oceanic crust and mantle wedge, we also estimated the water content distribution on and above the plate interface of the PHS plate. Near the S-SSE fault planes, almost the same amount of dehydration associated with phase transformations of hydrous minerals from blueschist to amphibolite and from amphibolite to amphibole eclogite within the oceanic crust were inferred along Okinawa Island and the Yaeyama Islands, respectively. On the other hand, the phase transformations within the mantle wedge were inferred only beneath the Yaeyama Islands, whereas no specific phase transformation was inferred beneath Okinawa Island around the S-SSE occurrence region. Therefore, we conclude that dehydrated fluid derived from the oceanic crust at the plate interface would play a key role in the occurrence of S-SSEs.

  May 2021, Scientific reports, 11(1) (1), 11251 - 11251, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism

  Yingfeng Ji, Ruyu Yan, Deng Zeng, Chaodi Xie, Weiling Zhu, Rui Qu, Shoichi Yoshioka

  American Geophysical Union (AGU), Feb. 2021, Geophysical Research Letters, 48(3) (3)

  [Refereed]

  Scientific journal


• Depth variation of seismic moment and recurrence interval in Japan

  Yingfeng Ji, Shoichi Yoshioka

  In repeating seismic event sequences within a specialized horizontal area, the moment magnitude is usually scaled with the recurrence interval. In addition to two horizontal dimensions, the vertical dimension plays a certain role in affecting the scaling law. However, whether and how the changing depth influences the scaling law remain enigmatic. Based on a large number of earthquake records with high-resolution epicenter locations in recent decades in Japan, we focus on a comparison between the 3-D seismic moment and seismic interval, which recognize the vertical dimension as the same dimension as the horizontal distances. The results show that (1) the seismic moment scaling law is applicable in the multiparameter 3-D models by visiting the 1.8 million events collected during a period of 15 years; (2) the vertical dimension of depth plays an important role in the Mo–SI relationship as well as in the variance in the 3-D seismic moment–interval magnitudes; and (3) the seismic moment rate, attributable to the plate convergence rate, varies with area and depth in influencing the regional earthquake recurrence frequency.

  Springer Science and Business Media LLC, Dec. 2020, Geoscience Letters, 8(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Contrasting volcano spacing along SW Japan arc caused by difference in age of subducting lithosphere

  Yoshiyuki Tatsumi, Nobuaki Suenaga, Shoichi Yoshioka, Katsuya Kaneko, Takumi Matsumoto

  The SW Japan arc built by subduction of the Philippine Sea (PHS) plate exhibits uneven distribution of volcanoes: thirteen Quaternary composite volcanoes form in the western half of this arc, Kyushu Island, while only two in the eastern half, Chugoku district. Reconstruction of the PHS plate back to 14 Ma, together with examinations based on thermal structure models constrained by high-density heat flow data and a petrological model for dehydration reactions suggest that fluids are discharged actively at depths of 90–100 km in the hydrous layer at the top of the old (> 50 Ma), hence, cold lithosphere sinking beneath Kyushu Island. In contrast, the young (15–25 Ma) oceanic crust downgoing beneath Chugoku district releases fluids largely at shallower depths, i.e. beneath the non-volcanic forearc, to cause characteristic tectonic tremors and low-frequency earthquakes (LFEs) and be the source of specific brine springs. Much larger amounts of fluids supplied to the magma source region in the western SW Japan arc could build more densely-distributed volcanoes.

  Springer Science and Business Media LLC, Dec. 2020, Scientific Reports, 10(1) (1), 15005 - 15005, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Subduction thermal structure, metamorphism and seismicity beneath northcentral Chile

  Yingfeng Ji, Shoichi Yoshioka, Vlad C. Manea, Marina Manea, Nobuaki Suenaga

  Sep. 2019, Journal of Geodynamics, 129, 299 - 312, English

  [Refereed]

  Scientific journal


• Fault stress inversion reveals seismogenic asperity of the 2011 Mw 9.0 Tohoku-Oki earthquake

  Zhoumin Xie, Yongen Cai, Chi-yuen Wang, Shoichi Yoshioka, Momo Tanaka

  Aug. 2019, Scientific Reports, 9, 11987, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Two-Dimensional Thermal Modeling of the Philippine Sea Plate Subduction in Central Japan: Implications for Gap of Low-Frequency Earthquakes and Tectonic Tremors

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto, Vlad C. Manea, Marina Manea, Yingfeng Ji

  2019, Journal of Geophysical Research: Solid Earth, 124(7) (7), 6848 - 6865, English

  [Refereed]

  Scientific journal


• Subduction thermal regime, slab dehydration, and seismicity distribution beneath Hikurangi based on 3-D simulations

  Nobuaki Suenaga, Yinfeng Ji, YOSHIOKA SHOICHI, Deshan Feng

  Mar. 2018, Journal of Geophysical Research: Solid Earth, 123(4) (4), 3080 - 3097, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Two-dimensional thermal modeling associated with subduction of the Philippine Sea plate in southern Kyushu, Japan

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto, Yingfeng Ji

  Jan. 2018, Tectonophysics, 723, 288 - 296, English

  [Refereed]

  Scientific journal


• Subduction thermal structure, metamorphism and seismicity beneath northcentral Chile

  Yingfeng Ji, Shoichi Yoshioka, Vlad C. Manea, Marina Manea, Nobuaki Suenaga

  2018, Journal of Geodynamics, English

  [Refereed]

  Scientific journal


• Geodetic inversion for spatial distribution of slow earthquakes under sparsity constraints

  Takane Hori, Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, YOSHIOKA SHOICHI, Masato Okada

  2018, Journal of Physics: Conference Series, 1036, 012018, English

  [Refereed]

  Scientific journal


• Seismogenesis of dual subduction beneath Kanto, central Japan controlled by fluid release

  Yingfeng Ji, Shoichi Yoshioka, Vlad C. Manea, Marina Manea

  Dec. 2017, SCIENTIFIC REPORTS, 7, 16864, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evidence of Dynamic Crustal Deformation in Tohoku, Japan, From Time-Varying Receiver Functions

  R. W. Porritt, S. Yoshioka

  Oct. 2017, TECTONICS, 36(10) (10), 1934 - 1946, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Thermal State, Slab Metamorphism, and Interface Seismicity in the Cascadia Subduction Zone Based On 3-D Modeling

  Yingfeng Ji, Shoichi Yoshioka, Yuval A. Banay

  Sep. 2017, GEOPHYSICAL RESEARCH LETTERS, 44(18) (18), 9242 - 9252, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Shoichi Yoshioka, Masato Okada, Takane Hori

  Jul. 2017, SCIENTIFIC REPORTS, 7, 6129, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Slab dehydration and earthquake distribution beneath southwestern and central Japan based on three-dimensional thermal modeling

  Yingfeng Ji, Shoichi Yoshioka

  Mar. 2017, GEOPHYSICAL RESEARCH LETTERS, 44(6) (6), 2679 - 2686, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Three-dimensional numerical modeling of thermal regime and slab dehydration beneath Kanto and Tohoku, Japan

  Yingfeng Ji, Shoichi Yoshioka, Vlad Constantin Manea, Marina Manea, Takumi Matsumoto

  Jan. 2017, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 122(1) (1), 332 - 353, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Relationships among temperature, dehydration of the subducting Philippine Sea plate, and the occurrence of a megathrust earthquake, low-frequency earthquakes, and a slow slip event in the Tokai district, central Japan

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto

  Nov. 2016, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 260, 44 - 52, English

  [Refereed]

  Scientific journal


• Three-dimensional numerical modeling of temperature and mantle flow fields associated with subduction of the Philippine Sea plate, southwest Japan

  Yingfeng Ji, Shoichi Yoshioka, Takumi Matsumoto

  Jun. 2016, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 121(6) (6), 4458 - 4482, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Slab pileup in the mantle transition zone and the 30 May 2015 Chichi-jima earthquake

  Robert W. Porritt, Shoichi Yoshioka

  May 2016, GEOPHYSICAL RESEARCH LETTERS, 43(10) (10), 4905 - 4912, English

  [Refereed]

  Scientific journal


• Spatiotemporal slip distributions of three long-term slow slip events beneath the Bungo Channel, southwest Japan, inferred from inversion analyses of GPS data

  Shoichi Yoshioka, Yoshiko Matsuoka, Satoshi Ide

  Jun. 2015, GEOPHYSICAL JOURNAL INTERNATIONAL, 201(3) (3), 1437 - 1455, English

  [Refereed]

  Scientific journal


• Relationship between temperatures and fault slips on the upper surface of the subducting Philippine Sea plate beneath the Kanto district, central Japan

  Shoichi Yoshioka, Rumi Takagi, Takumi Matsumoto

  May 2015, GEOPHYSICAL JOURNAL INTERNATIONAL, 201(2) (2), 878 - 890, English

  [Refereed]

  Scientific journal


• Impact of phase change kinetics on the Mariana slab within the framework of 2-D mantle convection

  Shoichi Yoshioka, Yoku Torii, Michael R. Riedel

  Mar. 2015, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 240, 70 - 81, English

  [Refereed]

  Scientific journal


• Effects of slab geometry and obliquity on the interplate thermal regime associated with the subduction of three-dimensionally curved oceanic plates

  Yingfeng Ji, Shoichi Yoshioka

  Jan. 2015, GEOSCIENCE FRONTIERS, 6(1) (1), 61 - 78, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Dominant role of temperature on deep earthquake mechanics for the Tonga slab near the bottom of the upper mantle

  Satoshi Kaneshima, Shoichi Yoshioka

  Springer New York LLC, Oct. 2014, Academic Psychiatry, 66(1) (1), English

  [Refereed]

  Scientific journal


• Dominant role of temperature on deep earthquake mechanics for the Tonga slab near the bottom of the upper mantle

  Satoshi Kaneshima, Shoichi Yoshioka

  Oct. 2014, EARTH PLANETS AND SPACE, 66, English

  [Refereed]

  Scientific journal


• Along-strike variations in temperature and tectonic tremor activity along the Hikurangi subduction zone, New Zealand

  Suguru Yabe, Satoshi Ide, Shoichi Yoshioka

  Oct. 2014, EARTH PLANETS AND SPACE, 66, English

  [Refereed]

  Scientific journal


• Along-strike variations in temperature and tectonic tremor activity along the hikurangi subduction zone, New Zealand

  Suguru Yabe, Satoshi Ide, Shoichi Yoshioka

  2014, Earth, Planets and Space, 66(1) (1), English

  [Refereed]

  Scientific journal


• Two-dimensional thermal modeling of subduction of the Philippine Sea plate beneath southwest Japan

  Shoichi Yoshioka, Yoichiro Suminokura, Takumi Matsumoto, Junichi Nakajima

  Nov. 2013, TECTONOPHYSICS, 608, 1094 - 1108, English

  [Refereed]

  Scientific journal


• Seismic attenuation beneath northeastern Japan: Constraints on mantle dynamics and arc magmatism

  Junichi Nakajima, Shuhei Hada, Erika Hayami, Naoki Uchida, Akira Hasegawa, Shoichi Yoshioka, Toru Matsuzawa, Norihito Umino

  Nov. 2013, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 118(11) (11), 5838 - 5855, English

  [Refereed]

  Scientific journal


• Interplate coupling along the Nankai Trough, southwest Japan, inferred from inversion analyses of GPS data: Effects of subducting plate geometry and spacing of hypothetical ocean-bottom GPS stations

  Shoichi Yoshioka, Yoshiko Matsuoka

  Jul. 2013, TECTONOPHYSICS, 600, 165 - 174, English

  [Refereed]

  Scientific journal


• Stress field change around the Mount Fuji volcano magma system caused by the Tohoku megathrust earthquake, Japan

  Eisuke Fujita, Tomofumi Kozono, Hideki Ueda, Yuhki Kohno, Shoichi Yoshioka, Norio Toda, Aiko Kikuchi, Yoshiaki Ida

  Jan. 2013, BULLETIN OF VOLCANOLOGY, 75(1) (1), 1 - 14, English

  [Refereed]

  Scientific journal


• Geophysical and mineralogical constraints on the post-spinel transformation for the Tonga slab

  Satoshi Kaneshima, Tomoaki Kubo, Shoichi Yoshioka

  Apr. 2012, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 196, 23 - 31, English

  [Refereed]

  Scientific journal


• B2-03 Effect on Mount Fuji volcanic system due to Tohoku Megathrust earthquake

  FUJITA Eisuke, KOZONO Tomofumi, OZAWA Taku, UEDA Hideki, KOHNO Yuhki, YOSHIOKA Shoichi, TODA Norio, KIKUCHI Aiko, IDA Yoshiaki

  The Volcanological Society of Japan, 2012, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2012, 71 - 71, Japanese


• Metastable olivine wedge and deep dry cold slab beneath southwest Japan

  Hitoshi Kawakatsu, Shoichi Yoshioka

  Feb. 2011, EARTH AND PLANETARY SCIENCE LETTERS, 303(1-2) (1-2), 1 - 10, English

  [Refereed]

  Scientific journal


• Effects of trench migration on fall of stagnant slabs into the lower mantle

  Shoichi Yoshioka, Aya Naganoda

  Nov. 2010, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 183(1-2) (1-2), 321 - 329, English

  [Refereed]

  Scientific journal


• Seismological and experimental constraints on metastable phase transformations and rheology of the Mariana slab

  Tomoaki Kubo, Satoshi Kaneshima, Yoku Torii, Shoichi Yoshioka

  Sep. 2009, EARTH AND PLANETARY SCIENCE LETTERS, 287(1-2) (1-2), 12 - 23, English

  [Refereed]

  Scientific journal


• A Present State and Perspective on Numerical Simulation Studies of Stagnant Slabs

  Shoichi Yoshioka

  Seismological Society of Japan, 2009, Zisin (Journal of the Seismological Society of Japan. 2nd ser.), 61(Supplement) (Supplement), 265 - 271

  [Refereed]

  Scientific journal


• Regionality of deep low-frequency earthquakes associated with subduction of the Philippine Sea plate along the Nankai Trough, southwest Japan

  Shoichi Yoshioka, Mamiko Toda, Junichi Nakajima

  Jul. 2008, EARTH AND PLANETARY SCIENCE LETTERS, 272(1-2) (1-2), 189 - 198, English

  [Refereed]

  Scientific journal


• Influence of temperature- and depth-dependent viscosity structures on postseismic deformation predictions for the large 1946 Nankai subduction zone earthquake

  Takeshi Katagi, Shoichi Yoshioka, Manabu Hashimoto

  Jun. 2008, TECTONOPHYSICS, 454(1-4) (1-4), 1 - 13, English

  [Refereed]

  Scientific journal


• Physical conditions producing slab stagnation: Constraints of the Clapeyron slope, mantle viscosity, trench retreat, and dip angles

  Yoku Torii, Shoichi Yoshioka

  Dec. 2007, TECTONOPHYSICS, 445(3-4) (3-4), 200 - 209, English

  [Refereed]

  Scientific journal


• Difference in the maximum magnitude of interplate earthquakes off Shikoku and in the Hyuganada region, southwest Japan, inferred from the temperature distribution obtained from numerical modeling - The proposed Hyuganada triangle

  Shoichi Yoshioka

  Nov. 2007, EARTH AND PLANETARY SCIENCE LETTERS, 263(3-4) (3-4), 309 - 322, English

  [Refereed]

  Scientific journal


• Temperature distribution of the upper surface of the subducted Philippine Sea Plate along the Nankai Trough, southwest Japan, from a three-dimensional subduction model: relation to large interplate and low-frequency earthquakes

  Shoichi Yoshioka, Koji Murakami

  Oct. 2007, GEOPHYSICAL JOURNAL INTERNATIONAL, 171(1) (1), 302 - 315, English

  [Refereed]

  Scientific journal

• 大地震と地震災害の発生メカニズム

  吉岡 祥一

  Aug. 2025, 月刊技術士, 704, 4 - 7


• 2018〜2019年豊後水道長期的SSEのすべりの時空間分布の推定

  Mar. 2022, 東濃地震科学研究所報告, 47, 85 - 102


• 津波波形とGNSSデータを用いた2015年イヤペル地震のすべり分布のインヴァージョン

  吉岡 祥一, 中村 嘉孝, 末永 伸明, 馬場 俊孝

  Mar. 2021, 東濃地震科学研究所報告, 46, 75 - 91


• 想定海溝型巨大地震に伴う津波の数値シミュレーション

  長田 史應, 吉岡 祥一, 末永 伸明, 馬場 俊孝

  Mar. 2019, 都市安全研究センター 研究報告, 23, 1 - 17, Japanese

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• 関東下における海洋プレートの温度・脱水分布と微小地震の発生の関連性について

  Shoichi Yoshioka

  Mar. 2019, 東濃地震科学研究所報告, Seq. no.42, 37 - 53, Japanese

  Report research institution


• Surface Deformation Prior to the Imminent 2011 mw 9.0 Tohoku-Oki Earthquake and its Geodynamic Implications

  Shoubiao Zhu, Shoichi Yoshioka, Momo Tanaka

  Mar. 2019, 都市安全研究センター 研究報告, 23, 160 - 177, English

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• Revisiting Inter-seismic Coupling in Southern Japan using Spatially Variable Slip Smoothing Constraints

  Francisco Ortega-Culaciati, Shoichi Yoshioka, Takahiro Akiyama

  Mar. 2019, 都市安全研究センター 研究報告, 23, 149 - 159, English

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• 津波地震の津波数値シミュレーション

  中村 嘉孝, 吉岡 祥一, 末永 伸明, 馬場 俊孝

  Mar. 2018, 都市安全研究センター 研究報告, 22, 1 - 19, Japanese

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• 西南日本におけるフィリピン海プレートの沈み込みに伴う温度場・流れ場の3次元数値モデリング

  吉岡 祥一, 季 頴鋒, 松本 拓己

  地震予知総合研究振興会東濃地震科学研究所, Mar. 2017, 東濃地震科学研究所報告, (38) (38), 107 - 125, Japanese


• Estimation of the dynamic rupture parameters for the 2016 Tottoriken-chubu earthquake

  SATO KEISUKE, YOSHIOKA SHOICHI, AOCHI HIDEO

  神戸大学都市安全研究センター, Mar. 2017, 都市安全研究センター 研究報告, (21) (21), 1 - 16, Japanese

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• Subduction of oceanic plate irregularities in south-central Mexico and the influence on subduction seismicity

  Marina Manea, Shoichi Yoshioka, Vlad Constantin Manea

  神戸大学都市安全研究センター, Mar. 2017, 都市安全研究センター 研究報告, (21) (21), 184 - 194, English

  Report research institution

  Link to Kobe Univ. Repository (Kernel)


• 太平洋プレートとフィリピン海プレートの沈み込みによる関東地方下の温度分布の数値シミュレーション

  吉岡 祥一, 高木 瑠美, 松本 拓己

  地震予知総合研究振興会東濃地震科学研究所, Mar. 2015, 東濃地震科学研究所報告, (34) (34), 61 - 77, Japanese


• フィリピン海プレートの沈み込みに伴う温度分布の数値シミュレーション(続報)

  吉岡 祥一, 隅倉 陽一郎, 松本 拓己

  地震予知総合研究振興会東濃地震科学研究所, Mar. 2012, 東濃地震科学研究所報告, (29) (29), 53 - 68, Japanese


• フィリピン海プレートの沈み込みに伴う温度分布の数値シミュレーション

  吉岡 祥一, 隅倉 陽一郎, 松本 拓己

  地震予知総合研究振興会東濃地震科学研究所, Mar. 2011, 東濃地震科学研究所報告, (27) (27), 127 - 145, Japanese


• 九州東部下における深部低周波地震

  吉岡 祥一

  地震予知総合研究振興会東濃地震科学研究所, Mar. 2010, 東濃地震科学研究所報告, (25) (25), 11 - 20, Japanese


• Regionality of deep low-frequency earthquakes associated with subduction of the Philippine Sea plate along the Nankai Trough, Southwest Japan (vol 272, pg 189, 2008)

  Shoichi Yoshioka, Mamiko Toda, Junichi Nakajima

  Jan. 2009, EARTH AND PLANETARY SCIENCE LETTERS, 277(1-2) (1-2), 292 - 292, English

  Others


• Interseismic locking of the plate interface in the northern Cascadia subduction zone, inferred from inversion of GPS data

  S Yoshioka, K Wang, S Mazzotti

  Mar. 2005, EARTH AND PLANETARY SCIENCE LETTERS, 231(3-4) (3-4), 239 - 247, English


• スタグナントスラブに伴うマントル構造の地震学的解析と数値シミュレーション

  田島 文子, 中久喜 伴益, 吉岡 祥一

  2005, 地震, 58,121-141


• Nonlinear multidimensional scaling and visualization of earthquake clusters over space, time and feature space

  W Dzwinel, DA Yuen, K Boryczko, Y Ben-Zion, S Yoshioka, T Ito

  2005, NONLINEAR PROCESSES IN GEOPHYSICS, 12(1) (1), 117 - 128, English


• Interplate coupling and a recent aseismic slow slip event in the Guerrero seismic gap of the Mexican subduction zone, as deduced from GPS data inversion using a Bayesian information criterion

  S Yoshioka, T Mikumo, Kostoglodov, V, KM Larson, AR Lowry, SK Singh

  Sep. 2004, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 146(3-4) (3-4), 513 - 530, English


• Effect of structural heterogeneity and slip distribution on coseismic vertical displacement from rupture on the Seattle fault

  Eric L. Geist, Shoichi Yoshioka

  2004, U.S. Geological Survey, Open File Report, 2004-1010, 15pp


• The effects of metastable olivine(alpha) wedge in subducted slabs on theoretical seismic waveforms of deep earthquakes

  S Yoshioka, T Murakami

  Dec. 2002, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 107(B12) (B12), English


• The effects of metastable olivine(alpha) wedge in subducted slabs on theoretical seismic waveforms of deep earthquakes

  S Yoshioka, T Murakami

  Dec. 2002, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 107(B12) (B12), English


• A dike intrusion model in and around Miyakejima, Niijima and Kozushima in 2000

  Takeo Ito, Shoichi Yoshioka

  22 Nov. 2002, Tectonophysics, 359(1-2) (1-2), 171 - 187, English


• A dike intrusion model in and around Miyakejima, Niijima and Kozushima in 2000

  T Ito, S Yoshioka

  Nov. 2002, TECTONOPHYSICS, 359(1-2) (1-2), 171 - 187, English


• Numerical simulations of deformation and dynamics of horizontally lying slabs

  S Yoshioka, H Sanshadokoro

  Oct. 2002, GEOPHYSICAL JOURNAL INTERNATIONAL, 151(1) (1), 69 - 82, English


• Coseismic slip distribution of the 1999 Chi-Chi, Taiwan, earthquake deduced from inversion analysis of GPS data

  S Yoshioka

  Oct. 2001, BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 91(5) (5), 1182 - 1189, English


• Coseismic slip distribution of the 1999 Chi-Chi, Taiwan, earthquake deduced from inversion analysis of GPS data

  S. Yoshioka

  Oct. 2001, Bulletin of the Seismological Society of America, 91(5) (5), 1182 - 1189, English


• The relationship between the physical properties of the assumed pyrolite composition and depth distributions of seismic velocities in the upper mantle

  T Murakami, S Yoshioka

  Oct. 2001, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 125(1-4) (1-4), 1 - 17, English


• Lateral variations of effective elastic thickness of the subducting Philippine Sea plate along the Nankai trough

  S Yoshioka, Y Ito

  2001, EARTH PLANETS AND SPACE, 53(4) (4), 261 - 273, English


• Interplate coupling in northeast Japan deduced from inversion analysis of GPS data

  Takeo Ito, Shoichi Yoshioka, Shin'Ichi Miyazaki

  28 Feb. 2000, Earth and Planetary Science Letters, 176(1) (1), 117 - 130, English

  Book review


• Interplate coupling in northeast Japan deduced from inversion analysis of GPS data

  T Ito, S Yoshioka, S Miyazaki

  Feb. 2000, EARTH AND PLANETARY SCIENCE LETTERS, 176(1) (1), 117 - 130, English


• Were Inland Major Earthquakes Triggered by Preceding Large and Medium-sized Earthquakes in and around the Japanese Islands and Interplate Coupling?-Investigation for the 1995 Hyogoken-Nanbu Earthquake, the 1984 Naganoken-Seibu Earthquake, and the Hokkaido-Tohoku Districts-

  SUGIHARA Yukinobu, KIRIHARA Shigenobu, YOSHIOKA Shoichi

  日本地震学会, 2000, Zisin : Journal of the Seismological Society of Japan, 52(4) (4), 469 - 485, Japanese


• 横たわるスラブの温度分布とP波速度異常の数値シミュレーション

  三社所 寛泰, 吉岡 祥一

  2000, 地震, 53, 25 - 35


• Great earthquake cycles along the Japan Trench and their migrations along the subducted slab with influence on the development of shallow shocks in the North-East China tectonic block

  HY Loo, XL Gao, T Mikumo, K Hirahara, S Yoshioka

  Sep. 1999, JOURNAL OF GEODYNAMICS, 28(2-3) (2-3), 175 - 192, English


• Interplate coupling in southwest Japan deduced from inversion analysis of GPS data

  Takeo Ito, Shoichi Yoshioka, Shin'ichi Miyazaki

  Aug. 1999, Physics of the Earth and Planetary Interiors, 115(1) (1), 17 - 34, English


• Interplate coupling in southwest Japan deduced from inversion analysis of GPS data

  Takeo Ito, Shoichi Yoshioka, Shin'ichi Miyazaki

  Aug. 1999, Physics of the Earth and Planetary Interiors, 115(1) (1), 17 - 34, English


• Velocity anomalies and spatial distributions of physical properties in horizontally lying slabs beneath the Northwestern Pacific region

  S Takenaka, H Sanshadokoro, S Yoshioka

  Apr. 1999, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 112(3-4) (3-4), 137 - 157, English


• Effects of three-dimensional inhomogeneous viscoelastic structures on postseismic surface deformations associated with the great 1946 Nankaido earthquake

  S Yoshioka, H Suzuki

  Apr. 1999, PURE AND APPLIED GEOPHYSICS, 154(2) (2), 307 - 328, English


• Effects of three-dimensional inhomogeneous viscoelastic structures on postseismic surface deformations associated with the great 1946 Nankaido earthquake

  S Yoshioka, H Suzuki

  Apr. 1999, PURE AND APPLIED GEOPHYSICS, 154(2) (2), 307 - 328, English


• Velocity anomalies and spatial distributions of physical properties in horizontally lying slabs beneath the Northwestern Pacific region

  S Takenaka, H Sanshadokoro, S Yoshioka

  Apr. 1999, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 112(3-4) (3-4), 137 - 157, English


• GPSデータを用いた西南日本におけるプレート間カップリングの推定

  吉岡祥一, 伊藤武男, 宮崎真一

  海洋出版, 1999, 月刊地球, 21(4) (4), 197 - 204, Japanese


• GPSデータのインヴァージョン解析から推定した東北日本におけるプレート間カップリングの推定

  伊藤武男, 吉岡祥一, 宮崎真一

  1999, 月刊地球, 25, 158 - 165


• Numerical simulation of temperature distribution and velocity anomalies in the horizontally lying slabs just above the lower mantle

  SANSHADOKORO Hiroyasu, TAKENAKA Satoshi, YOSHIOKA Shoichi

  09 Oct. 1998, 日本地震学会講演予稿集 = Programme and abstracts, the Seismological Society of Japan, 1998(2) (2), Japanese


• Numerical simulation of displacement and stress fields associated with the 1993 Kushiro-oki, Japan, earthquake

  S Yoshioka, YO Tokunaga

  Oct. 1998, PURE AND APPLIED GEOPHYSICS, 152(3) (3), 443 - 464, English


• Numerical simulation of displacement and stress fields associated with the 1993 Kushiro-oki, Japan, earthquake

  S Yoshioka, YO Tokunaga

  Oct. 1998, PURE AND APPLIED GEOPHYSICS, 152(3) (3), 443 - 464, English


• Stress fields associated with metastable phase transitions in descending slabs and deep-focus earthquakes

  S Yoshioka, R Daessler, DA Yuen

  Dec. 1997, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 104(4) (4), 345 - 361, English


• An attempt to detect reflected waves from the lower boundary of a descending slab

  T Hiyoshi, S Yoshioka

  Dec. 1997, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 104(4) (4), 331 - 344, English


• Stress fields associated with metastable phase transitions in descending slabs and deep-focus earthquakes

  S Yoshioka, R Daessler, DA Yuen

  Dec. 1997, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 104(4) (4), 345 - 361, English


• An attempt to detect reflected waves from the lower boundary of a descending slab

  T Hiyoshi, S Yoshioka

  Dec. 1997, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 104(4) (4), 331 - 344, English


• Velocity anomalies and spatial distribution of physical properties in a horizontally lying slab in the Northwestern Pacific region

  TAKENAKA Satoshi, SANSHADOKORO Hiroyasu, YOSHIOKA Shoichi

  15 Sep. 1997, 日本地震学会講演予稿集 = Programme and abstracts, the Seismological Society of Japan, 1997(2) (2), Japanese


• 矩形断層面上のディスロケーションによる歪・応力場に及ぼす3次元不均質粘弾性構造の影響

  吉岡 祥一, 鈴木 晴子

  日本地震学会, 1997, 地震, 50(3) (3), 277 - 289, Japanese


• 横たわるスラブの温度分布と速度異常

  三社所 寛泰, 竹中 聡, 吉岡 祥一

  1997, 月刊地球, 19, 699 - 703


• Stress analysis in the vicinity of a crack using finite element method

  Shoichi Yoshioka, Aki Takeshita

  Ehime University, 1997, Memoirs of the Faculty of Science, Ehime University, 3, 1-20, 1 - 20, English


• Stress analysis in the vicinity of a crack using finite element method

  1997, 3, 1 - 20


• Source parameters controlling the generation and propagation of potential local tsunamis along the Cascadia margin

  E Geist, S Yoshioka

  Mar. 1996, NATURAL HAZARDS, 13(2) (2), 151 - 177, English


• Source parameters controlling the generation and propagation of potential local tsunamis along the Cascadia margin

  E Geist, S Yoshioka

  Mar. 1996, NATURAL HAZARDS, 13(2) (2), 151 - 177, English


• 矩形断層面上のディスロケーションによる表面変位に及ぼす3次元不均質粘弾性構造の影響

  吉岡 祥一, 鈴木 晴子

  海洋出版, 1996, 月刊地球, 18(12) (12), 841 - 849, Japanese


• Slab weakening: Mechanical and thermal‐mechanical consequences for slab detachment

  Shoichi Yoshioka, David A. Yuen, Tine B. Larsen

  1995, Island Arc, 4(2) (2), 89 - 103, English


• Three-dimensional numerical modeling of detachment of subducted lithosphere

  YOSHIOKA S, WORTEL M J R

  1995, Journal of Geophysical Research, 100(B10) (B10), 20223 - 20244


• INTERPLATE COUPLING IN THE KANTO DISTRICT, CENTRAL JAPAN, DEDUCED FROM GEODETIC DATA INVERSION AND ITS TECTONIC IMPLICATIONS

  S YOSHIOKA, T YABUKI, T SAGIYA, T TADA, M MATSUURA

  Jan. 1994, TECTONOPHYSICS, 229(3-4) (3-4), 181 - 200, English


• INTERPLATE COUPLING AND RELATIVE PLATE MOTION IN THE TOKAI DISTRICT, CENTRAL JAPAN, DEDUCED FROM GEODETIC DATA INVERSION USING ABIC

  S YOSHIOKA, T YABUKI, T SAGIYA, T TADA, M MATSUURA

  Jun. 1993, GEOPHYSICAL JOURNAL INTERNATIONAL, 113(3) (3), 607 - 621, English


• A MODEL OF POSTSEISMIC RECOVERY INDUCED BY A DEEP-FOCUS EARTHQUAKE

  S YOSHIOKA, HY LOO, T MIKUMO, K HIRAHARA

  Jul. 1992, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 72(1-2) (1-2), 83 - 98, English


• Three-dimensional numerical modeling of earthquake migration

  1992, Geophysical Research Letters, 19, 313 - 316

• Dictionary of Geophysics, Astrophysics, and Astronomy

  CRC Press, 2001


• Dictionary of Geophysics, Astrophysics, and Astronomy

  CRC Press, 2001

• 3D thermal structural and dehydration modeling in the southern Chile subduction zone and its relationship to interplate earthquakes and the volcanic chain

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati

  International Joint Workshop on Slow-to-Fast Earthquakes 2025, Sep. 2025

  Oral presentation


• 3-D thermal structure and dehydration near the Chile Triple Junction and its relation to slab window, tectonic tremors, and volcanoes

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati

  IAGA /IASPEI Joint Scientific Meeting 2025,, Sep. 2025

  Oral presentation


• Three-dimensional thermomechanical modelling beneath Guerrero, Mexico, and its relation to the occurrence of interplate seismic phenomena

  Nobuaki Suenaga, Shoichi Yoshioka, Vlad Constantin Manea, Marina Manea, Erika Jessenia Moreno, Yingfeng Ji

  Japan Geoscience Union Meeting 2025, May 2025

  Poster presentation


• 3-D thermal structure and dehydration near the Chile Triple Junction and its relation to slab window, tectonic tremors, and volcanoes

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati, Matthew Miller, Javier Ruiz

  Japan Geoscience Union Meeting 2025, May 2025

  Oral presentation


• Bayesian Selection of APG Sensor Locations off Taltal (∼25°S), Chile: Enhancing Imaging of Shallow Megathrust Slip Behavior

  Francisco Ortega-Culaciati, M. Moreno, D. Lange, H. Kopp, J.P. Merino, L. Jara, J. Ruiz, Shoichi Yoshioka, D. Melnick, R. Benavente

  SZNet Ocean Floor Observational Technologies Workshop, Jan. 2025

  Poster presentation


• A MUltiscale Sparse Estimation (MUSE) approach for quasi-static slip inversion

  Francisco Ortega-Culaciati, Vanessa Carrillo-Barra, Joaquín Hormazábal, Javier Ruiz, Roberto Benavente, Marcos Moreno, Axel Osses, Shoichi Yoshioka

  Slow-to-Fast Earthquake Workshop in Chile, Jan. 2025

  Oral presentation


• 3D thermal structural and dehydration modeling in the southern Chile subduction zone and its relationship to interplate earthquakes and the volcanic chain

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati

  Slow-to-Fast Earthquake Workshop in Chile, Jan. 2025

  Oral presentation


• A MUltiscale Sparse Estimation (MUSE) Approach for Quasi-Static Slip Inversion

  Francisco Hernan Ortega-Culaciati, Vanessa Carrillo-Barra, Joaquin Hormazabal, Javier A Ruiz, Roberto Benavente, Marcos Moreno, Shoichi Yoshioka

  AGU fall meating 2024, Dec. 2024

  Poster presentation


• 2D collision models with visco-elasto-plastic rheology applied to WNW-ESE shortening along the Niigata-Kobe Tectonic zone

  Erika Moreno, Shoichi Yoshioka, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga

  日本地震学会2024年度秋季大会, Oct. 2024

  Oral presentation


• 最近日向灘で発生した大規模長期的スロースリップイベントの検出とその時空間滑り分布の推定

  河端 浩希, 瀬下 幸成, 吉岡 祥一, Francisco Ortega-Culaciati

  日本地震学会2024年度秋季大会, Oct. 2024

  Oral presentation


• Detection of a recent large Hyuga-nada long-term slow slip event and estimation of its spatiotemporal slip distributions

  Hiroki Kawabata, Yukinari Seshimo, Shoichi Yoshioka, Francisco Ortega-Culaciati

  International Joint Workshop on Slow-to-Fast Earthquakes 2024, Sep. 2024

  Poster presentation


• WNW-ESE shortening in the Niigata-Kobe Tectonic zone explained by 2D visco-elasto-plastic collision numerical models

  Erika Jessenia Moreno, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga, Shoichi Yoshioka

  日本地球惑星科学連合2024年大会, May 2024

  Poster presentation


• Subduction thermal state, slab metamorphism and seismicity in Makran subduction zone

  Haris Faheem, Yingfeng Ji, Weiling Zhu, Rui Qu, Ye Zhu, Shoichi Yoshioka

  日本地球惑星科学連合2024年大会, May 2024

  Oral presentation


• Numerical modeling of subduction of the Philippine Sea plate tectonic history along the Nankai Trough

  Erika Jessenia Moreno, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga, Shoichi Yoshioka

  International Joint Workshop on Slow-to-Fast Earthquakes 2024, Mexico, Feb. 2024

  Poster presentation


• 2D visco-elasto-plastic subduction numerical models applied for the Kii Peninsula and Shikoku-Chugoku regions

  Erika Jessenia Moreno, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga, Shoichi Yoshioka

  世界の沈み込み帯におけるSlowとFastの破壊現象の実像に関する研究集会：富山2024, Feb. 2024

  Oral presentation


• レシーバー関数を用いたオリビン準安定領域のイメージング

  宮崎 一希, 中島 淳一, 吉岡 祥一

  日本地震学会2023年度秋季大会, Nov. 2023, 横浜, Domestic conference

  Poster presentation


• 九州下におけるホットプルームがフィリピン海スラブの屈曲に及ぼす影響 (3)

  香西 夏葵, 末永 伸明, 吉岡 祥一

  日本地震学会2023年度秋季大会, Oct. 2023, 横浜, Domestic conference

  Poster presentation


• 新潟－神戸歪集中帯における歪場の時空間変化 -GNSSを用いた長期的解析-

  河端 浩希, 吉岡 祥一

  日本地震学会2023年度秋季大会, Oct. 2023, 横浜, Domestic conference

  Poster presentation


• 2D subduction models in the presence of a high-density rigid continental block: a case study for the slab geometry beneath the Kii Peninsula

  Erika Moreno, Vlad Manea, Marina Manea, Nobuaki Suenaga, Shoichi Yoshioka

  日本地震学会2023年度秋季大会, Oct. 2023, 横浜, Domestic conference

  Oral presentation


• アラスカ沈み込み帯におけるプレート境界地震イベントと３次元温度構造・脱水分布との関連性

  吉岡祥一

  SF地震学B03班定例ミーティング, Aug. 2023, オンライン, Domestic conference

  Oral presentation


• 3-D thermal structure and dehydration in the southern Chile subduction zone and relation to interplate earthquakes and the volcanic chain

  Kaya Iwamoto, Nobuaki Suenaga, Shoichi Yoshioka, Francisco Ortega-Culaciati

  IUGG2023, Jul. 2023, Berlin, Domestic conference

  Oral presentation


• Slab diversity and segmentation along the Middle America Trench: a framework for understanding geodynamic processes of subduction

  Vlad Constantin Manea, Marina Manea, Shoichi Yoshioka, Erika Jessenia Moreno and Nobuaki Suenaga

  日本地球惑星科学連合2023年大会, May 2023, 千葉

  Poster presentation


• Thermal regime and slab dehydration beneath the Izu-Bonin arc: Implications for fast and slow subduction earthquake

  Weiling Zhu, Yingfeng Ji and Shoichi Yoshioka

  日本地球惑星科学連合2023年大会, May 2023, 千葉, Domestic conference

  Oral presentation


• Mosaicking Crustal Surface Morphostructure and Seismic Cycle Deformation Patterns in Chile and Japan using GNSS Velocities and Machine Learning

  Francisco Ortega-Culaciati, Marcos Moreno, Hiroki Kawabata, Shoichi Yoshioka, Vicente Yañez-Cuadra, Felipe Donoso, Juan Carlos Báez, Andrés Tassara, Joaquin Hormazabal

  日本地球惑星科学連合2023年大会, May 2023, 千葉, Domestic conference

  Oral presentation


• Numerical modeling of subduction and evaluation of the Philippine Sea plate tectonic history along the Nankai Trough

  Erika Moreno, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga andShoichi Yoshioka

  日本地球惑星科学連合2023年大会, May 2023, 千葉, Domestic conference

  Oral presentation


• Rheological segmentation of the Cocos slab and its relation with the 2017 M8.2 Tehuantepec earthquake

  Marina Manea, Vlad Constantin Manea, Shoichi Yoshioka, Erika Jessenia Moreno and Nobuaki Suenaga

  日本地球惑星科学連合2023年大会, May 2023, 千葉, Domestic conference

  Poster presentation


• Subduction zone diversity along Middle America Trench

  Vlad Constantin Manea, Marina Manea, Shoichi Yoshioka, Erika Moreno and Nobuaki Suenaga

  SF地震学A03班グループミーティング, Feb. 2023, English, Beppu, Domestic conference

  Oral presentation


• Numerical modeling of subduction and evaluation of the Philippine Sea plate tectonic history along the Nankai Trough

  Erika Moreno, Vlad Constantin Manea, Marina Manea, Nobuaki Suenaga and Shoichi Yoshioka

  SF地震学A03班グループミーティング, Feb. 2023, English, Beppu, Domestic conference

  Oral presentation


• 九州下におけるホットプルームがフィリピン海スラブの屈曲に及ぼす影響(2)

  香西 夏葵・末永 伸明・吉岡 祥一

  日本地震学会2022年度秋季大会, Oct. 2022, Japanese, 札幌, Domestic conference

  Oral presentation


• チリ沈み込み帯南部における3次元温度構造・脱水分布と海溝型巨大地震・通常地震・火山列との関連性

  岩本 佳耶・末永 伸明・吉岡 祥一

  日本地震学会2022年度秋季大会, Oct. 2022, Japanese, 札幌, Domestic conference

  Poster presentation


• 九州下におけるホットプルームがフィリピン海スラブの屈曲に及ぼす影響

  香西 夏葵・末永 伸明・吉岡 祥一

  日本地球惑星科学連合大会2022, Jun. 2022, Japanese, オンライン・千葉, Domestic conference

  Poster presentation


• Illuminating slow earthquakes: an approach from thermal modeling

  Shoichi Yoshioka, Nobuaki Suenaga and Kayo Iwamoto

  日本地球惑星科学連合大会2022, May 2022, English, オンライン・千葉, Domestic conference

  [Invited]

  Oral presentation


• Strain accumulation and release processes associated with theoccurrence of SSEs in the Japanese Islands

  Hiroki Kawabata and Shoichi Yoshioka

  日本地球惑星科学連合大会2022, May 2022, English, オンライン・千葉, Domestic conference

  Oral presentation


• 中部日本下深部のフィリピン海プレート形状とスラブウィンドウの形成

  宮崎 一希・中島 淳一・末永 伸明・吉岡 祥一

  日本地球惑星科学連合大会2022, May 2022, Japanese, オンライン・千葉, Domestic conference

  Oral presentation


• 地下構造の不確かさを考慮したベイズマルチモデル断層すべり推定について

  縣 亮一郎・中田 令子・笠原 天人・八木 勇治・瀬下 幸成・吉岡 祥一・飯沼 卓史

  日本地球惑星科学連合大会2022, May 2022, Japanese, オンライン・千葉, Domestic conference

  [Invited]

  Oral presentation


• 豊後水道下で発生する長期的スロースリップイベントについて

  吉岡 祥一, 瀬下 幸成, 松岡 美子, 井出 哲

  地殻変動研究のこれまでとこれから, Mar. 2022

  Oral presentation


• 地下構造の不確かさを考慮したベイズマルチモデル断層すべり推定

  縣 亮一郎, 中田 令子, 笠原 天人, 八木 勇治, 瀬下 幸成, 吉岡 祥一, 飯沼 卓史

  都市地震リスク軽減に向けたデータ駆動型研究の最前線, Mar. 2022

  Oral presentation


• 6-year achievement of the Japanese B1 group

  Shoichi Yoshioka, Nobuaki Suenaga, Yingfeng Ji, Tomotaka Iwata, Hiroshi Kawase, Fumiaki Nagashima, Shinichi Matsushima, Ryosuke Ando, Bunichiro Shibazaki

  JST-JICA-UNAM Final Workshop, Mar. 2022

  Oral presentation


• 本プロジェクトにおける研究計画

  吉岡 祥一

  SF地震学B03班キックオフミーティング, Dec. 2021

  Oral presentation


• 今年度及び5カ年の活動計画

  吉岡祥一

  学術変革領域研究A03班キックオフミーティング, Nov. 2021, オンライン

  Oral presentation


• アラスカ沈み込み帯における深部低周波微動と３次元温度構造・脱水分布との関連性

  岩本 佳耶, 末永 伸明, 吉岡 祥一

  本地震学会2021年度秋季大会, Oct. 2021, オンライン

  Poster presentation


• 北陸地方下のフィリピン海プレート形状を探る

  宮崎 一希, 中島 淳一, 末永 伸明, 吉岡 祥一

  本地震学会2021年度秋季大会, Oct. 2021, オンライン

  Oral presentation


• 豊後水道長期的スロースリップにおけるすべり分布のベイズマルチモデル推定：先験的拘束条件の推定結果に対する影響

  縣 亮一郎, 中田 令子, 笠原 天人, 八木 勇治, 瀬下 幸成, 吉岡 祥一, 飯沼 卓史

  本地震学会2021年度秋季大会, Oct. 2021, オンライン

  Oral presentation


• A Bayesian multi-model inference for fault slip distribution: the effect of prior constraints in the estimation for long-term slow slip events beneath the Bungo Channel

  Ryoichiro Agata,Ryoko Nakata,Amato Kasahara,Yuji Yagi,Yukinari Seshimo,Shoichi Yoshioka and Takeshi Iinuma

  International Joint Workshop on Slow Earthquakes 2021, Sep. 2021, オンライン

  Poster presentation


• Spatiotemporal slip distributions of the 2018-2019 Bungo Channel long-term slow slip event

  Yukinari Seshimo,Shoichi Yoshioka

  Japan Geoscience Union Meeting 2021, Jun. 2021, オンライン

  Oral presentation


• アラスカ沈み込み帯における３次元温度構造モデリング

  岩本 佳耶,末永 伸明,吉岡 祥一

  日本地球惑星科学連合2021年大会, Jun. 2021, オンライン

  Oral presentation


• 沈み込むスラブの年代の違いによる西南日本の火山分布の特徴～熱構造の観点から～

  松本 拓己, 巽 好幸, 末永 伸明, 吉岡 祥一, 金子 克哉

  日本地球惑星科学連合2021年大会, Jun. 2021, オンライン

  [Invited]

  Invited oral presentation


• 中部日本下に沈み込んだフィリピン海プレートの行方

  宮崎 一希,中島 淳一,末永 伸明,吉岡 祥一

  日本地球惑星科学連合2021年大会, Jun. 2021, オンライン

  Oral presentation


• Three-dimensional thermal modeling associated with subduction of the Cocos plate beneath southwestern Mexico, and its relation to the occurrence of interplate seismic events

  Shoichi Yoshioka

  Online Workshop in February 2021 for “The Project for Hazard Assessment of Large Earthquakes and Tsunamis in the Mexican Pacific Coast for Disaster Mitigation”, Feb. 2021

  Oral presentation


• 3-D thermal modeling of generation mechanisms for short-term slowslip events and low-frequency earthquakes along the Ryukyu trench

  Nobuaki Suenaga, Shoichi Yoshioka

  JpGU-AGU Joint Meeting 2020

  Poster presentation


• 2011年東北地方太平洋沖地震前15年間のプレート間カップリングの時空間分布の推定

  阿部 大毅, 吉岡 祥一

  JpGU-AGU Joint Meeting 2020, Jul. 2020

  Oral presentation


• Fault stress inversion reveals seismogenic asperity of the 2011 Mw 9.0 Tohoku-Oki earthquake

  Yongen Cai, Zhoumin Xie, Chi-Yuen Wang, Shoichi Yoshioka and Momo Tanaka

  AGU fall meating 2019, Dec. 2019, English, International conference

  Poster presentation


• Spatial distribution of long-term slow slip event from 2018 to 2019 beneath the Bungo Channel under sparsity constraints

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Takahiro Akiyama, Shoichi Yoshioka, Masato Okada, Takane Hori

  International Joint Workshop on Slow Earthquakes 2019, Sep. 2019, 仙台, International conference

  Poster presentation


• 琉球海溝におけるフィリピン海プレートの沈み込みに伴う３次元温度構造モデリング

  末永 伸明, 吉岡 祥一, 季 穎鋒

  日本地震学会2019年度秋季大会, Sep. 2019, 京都, Domestic conference

  Oral presentation


• 理論津波波形を用いた断層すべり分布のインヴァージョンの検討

  中村 嘉孝, 吉岡 祥一, 馬場 俊孝

  日本地震学会2019年度秋季大会, Sep. 2019, 京都, Domestic conference

  Poster presentation


• GNSSデータを用いた2000年三宅島・神津島周辺の地震・火山活動に伴う地殻変動のモデル化

  秋山 峻寛, 吉岡 祥一

  日本地震学会2019年度秋季大会, Sep. 2019, 京都, Domestic conference

  Oral presentation


• Subduction thermal structure, metamorphism and seismicity beneath northcentral Chile

  Yinfeng Ji, Shoichi Yoshioka, Vlad C. Manea, Marina Manea, Nobuaki Suenaga

  27th IUGG General Assembly, Jul. 2019, English, Montreal, International conference

  Oral presentation


• Three-dimensional thermal modeling associated with subduction of the Philippine Sea plate at the Ryukyu Trench, and its relation to the occurrence of interplate seismic events

  Nobuaki Suenaga, Shoichi Yoshioka, Yinfeng Ji

  Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• Spatial distribution of slow slip events off the Boso peninsula from 1996 to 2018 under sparsity constraints

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Takahiro Akiyama, Shoichi Yoshioka, Masato Okada, Takane Hori

  Japan Geoscience Union Meeting 2019, May 2019, English, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• Spatiotemporal locking state on the plate interface prior to the 2011 Tohoku-Oki earthquake inverted from GNSS data

  Momo Tanaka, Shoichi Yoshioka

  AGU Fall Meeting 2018, Dec. 2018, English, Washington, D.C., International conference

  Poster presentation


• Seismogenesis of Dual Subduction Beneath Kanto, Central Japan Controlled by Fluid Release

  Shoichi Yoshioka, Yingfeng Ji, Vlad C. Manea, Marina Manea

  AGU Fall Meeting 2018, Dec. 2018, English, Washington, D.C., International conference

  Oral presentation


• Three-dimensional thermal modeling associated with subduction of the Cocos plate beneath southern Mexico, and its relation to the occurrence of interplate seismic events

  Shoichi Yoshioka

  JST-JICA-UNAM Workshop for the Mid-term Evaluation, Nov. 2018, English, メキシコシティ, International conference

  Oral presentation


• 東北地方太平洋沖地震前 15 年間の地殻変動から推定したプレート間の固着・非地震性すべりの時空間分布

  田中 もも, 吉岡 祥一

  日本地震学会2018年度秋季大会, Oct. 2018, Japanese, 郡山, Domestic conference

  Poster presentation


• 東北地方太平洋域地震の隣接地域における想定海溝型巨大地震に伴う津波の数値シミュレーション

  長田 史應, 吉岡 祥一, 馬場 俊孝

  日本地震学会2018年度秋季大会, Oct. 2018, Japanese, 郡山, Domestic conference

  Poster presentation


• Spatiotemporal Distributions of Interplate Coupling and Aseismic Slips Prior to the 2011 Tohoku-Oki Earthquake Inferred From GNSS Data

  Momo Tanaka, Shoichi Yoshioka

  10th ACES International Workshop, Sep. 2018, English, 南あわじ, International conference

  Oral presentation


• Seismogenesis of Double Subduction Beneath Kanto, Central Japan Controlled by Fluid Release

  Shoichi Yoshioka, Yingfeng Ji, Vlad C. Manea, Marina Manea

  10th ACES International Workshop, Sep. 2018, English, 南あわじ, International conference

  Oral presentation


• Discussion based on spatial distribution of long-term slow slip events beneath the Bungo Channel

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Shoichi Yoshioka, Masato Okada, Takane Hori

  International Joint Workshop on Slow Earthquakes 2018, Sep. 2018, English, 福岡, International conference

  Poster presentation


• Geodetic Data Inversion for Spatial Distribution of Long-term Slow Slip Events Beneath the Bungo Channel, Southwest Japan, Using Sparse Modelling,

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Shoichi Yoshioka, Masato Okada, Takene Hori

  the AOGS 15th Annual Meeting, Jun. 2018, English, Honolulu, International conference

  Poster presentation


• Spatial distribution of long-term slow slip events beneath the Bungo Channel under sparsity constraints (II)

  Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, Momo Tanaka, Shoichi Yoshioka, Masato Okada, Takane Hori

  日本地球惑星科学連合2018年大会, May 2018, English, 千葉, Domestic conference

  [Invited]

  Invited oral presentation


• Postseismic displacement field associated with the 2011 Tohoku-oki earthquake by temperature dependent viscosity model

  Yuval Banay, Shoichi Yoshioka, Momo Tanaka, Yingfeng Ji

  日本地球惑星科学連合2018年大会, May 2018, English, 千葉, Domestic conference

  Poster presentation


• GNSSデータを用いた日本列島の歪速度場の時空間変化

  秋山 峻寛, 吉岡 祥一, 田中 もも

  日本地球惑星科学連合2018年大会, May 2018, Japanese, 千葉, Domestic conference

  Poster presentation


• 3D Rheology effects on postseismic viscoelastic surface displacement fields in subduction zones

  Yuval Banay, Shoichi Yoshioka, Yingfeng Ji

  日本地球惑星科学連合2018年大会, May 2018, English, 千葉, Domestic conference

  Poster presentation


• 環太平洋沈み込み帯における温度・脱水分布とプレート間地震の解明に向けて

  YOSHIOKA SHOICHI, Yingfeng Ji, Vlad C. Manea, Marina Manea

  研究集会「夢のある話を」, Mar. 2018, Japanese, 京都, Domestic conference

  Oral presentation


• テクトニックな変動から推定した2011年東北地方太平洋沖地震前のプレートの固着状態と非地震性すべりの時空間分布

  YOSHIOKA SHOICHI, 田中 もも

  東京大学大気海洋研究所共同利用研究集会「地球環境と固体地球のかかわり」, Nov. 2017, Japanese, 柏, Domestic conference

  Oral presentation


• Spatiotemporal distribution of interplate locking and aseismic slip prior to the 2011 Tohoku-Oki earthquake

  Momo Tanaka, YOSHIOKA SHOICHI, Yukiko Nishino

  スロー地震合同研究集会2017, Sep. 2017, English, 松山, Domestic conference

  Poster presentation


• On spatial distribution of dynamic rupture parameters for the 2016 Tottoriken-chubu earthquake

  Keisuke Sato, YOSHIOKA SHOICHI, Hideo Aochi

  スロー地震合同研究集会2017, Sep. 2017, English, 松山, Domestic conference

  Poster presentation


• Geodetic invention for spatial distridution of slow earthquakes under sparsity constraints

  Takae Hori, Ryoko Nakata, Hideitsu Hino, Tatsu Kuwatani, YOSHIOKA SHOICHI, Masato Osada

  International Meeting on “High-Dimensional Data-Driven Science” (HD3-2017), Sep. 2017, English, Kyoto, International conference

  Oral presentation


• Two-dimentional thermal modeling associated with subduction of the Philippine Sea Plate beneath southern Kyushu, Japan

  Nobuaki Suenaga, YOSHIOKA SHOICHI, Takumi Matsumoto

  IAG-IASPEI 2017, Aug. 2017, English, 神戸, International conference

  Oral presentation


• Spatiotemporal distribution of locking and aseismic slips prior to the 2011 Tohoku-oki earthquake

  Momo Tanaka, YOSHIOKA SHOICHI, Yukiko Nishino

  IAG-IASPEI 2017, Aug. 2017, English, Kobe, International conference

  Poster presentation


• Interplate thermal regime and slab dehydration at the source region of episodic tremor and slow slip events in the Cascadia subduction zone

  Yingfeng Ji, YOSHIOKA SHOICHI

  IAG-IASPEI 2017, Aug. 2017, English, Kobe, International conference

  Oral presentation


• Estimation of the dynamic repture parameters for the 2016 Tottoriken-chubu earthquake

  Keisuke Sato, Shoichi Yoshioka, Hideo Aochi

  IAG-IASPEI 2017, Aug. 2017, English, Kobe, International conference

  Poster presentation


• Spatial distribution of long-term slow slip events beneath the Bungo Channel under sparsity constraints

  中田 令子, 日野 英逸, 桑谷 立, YOSHIOKA SHOICHI, 岡田 真人, 堀 高峰

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 千葉, International conference

  Poster presentation


• Thermal regime and slab dehydration in the subducted Juan de Fuca plate beneath the Cascadia subduction zone based on 3D numerical simulation

  季 頴鋒, YOSHIOKA SHOICHI

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 千葉, Domestic conference

  Poster presentation


• 三次元数値シミュレーションによるカスかディア沈み込み帯における?ファンデフカプレートの温度構造とスラブ脱水について

  季 頴鋒, YOSHIOKA SHOICHI

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 千葉, Domestic conference

  Poster presentation


• 九州南部の非火山地域における2次元熱対流モデリング

  末永 伸明, YOSHIOKA SHOICHI, 松本 拓己

  JpGU-AGU Joint Meeting 2017, May 2017, English, 千葉, International conference

  Poster presentation


• テクトニックな変動から推定した東北地方太平洋沖地震前のプレート間の固着と非地震性すべりの時空間分布

  YOSHIOKA SHOICHI, TANAKA MOMO

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 千葉, Domestic conference

  Poster presentation


• Thermal regime and slab dehydration in the subducted Juan de Fuca plate beneath the Cascadia subduction zone based on 3D numerical simulation,

  Yingfeng Ji, Shoichi Yoshioka

  JpGU-AGU Joint Meeting 2017,, May 2017, English, 千葉, Domestic conference

  Poster presentation


• Thermal regime and slab dehydration in the subducted Juan de Fuca plate beneath the Cascadia subduction zone based on 3D numerical simulation,

  Yingfeng Ji, Shoichi Yoshioka

  JpGU-AGU Joint Meeting 2017, May 2017, English, 千葉, Domestic conference

  Poster presentation


• Spatial distribution of long-term slow slip events beneath the Bungo Channel under sparsity constraints

  中田 令子, 日野 英逸, 桑谷 立, YOSHIOKA SHOICHI, 岡田 真人, 堀 高峰

  JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conference

  Poster presentation


• 2-D thermal modeling along a non-volcanic region in southern Kyushu, Japan,

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto

  JpGU-AGU Joint Meeting 2017, May 2017, English, 千葉, Domestic conference

  Poster presentation


• 2-D thermal modeling along a non-volcanic region in southern Kyushu, Japan

  末永 伸明, YOSHIOKA SHOICHI, 松本 拓己

  JpGU-AGU Joint Meeting 2017, May 2017, English, 千葉, International conference

  Poster presentation


• 2016年鳥取県中部地震の動的断層破壊シミュレーション

  佐藤 圭介, YOSHIOKA SHOICHI, 青地 秀雄

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 千葉, Domestic conference

  Poster presentation


• Thermal regime, slab dehydration and seismicity distribution beneath the Hikurangi subduction zone based on 3D simulation,

  Yingfeng Ji, Shoichi Yoshioka

  AGU FALL MEETING 2016, Dec. 2016, English, San Francisco, International conference

  Poster presentation


• Numerical simulations of temperature, dehydration, and flow fields associated with subduction of the Cocos plate, and its relation to the occurrence of interplate seismic events in southern Mexico,

  Nobuaki Suenaga, Yingfeng Ji, Shoichi Yoshioka, Maria Manea, Vlad C. Manea

  AGU FALL MEETING 2016, Dec. 2016, English, San Francisco, International conference

  Poster presentation


• Numerical simulations of temperature, dehydration, and flow fields associated with subduction of the cocos plate, and its relation to the occurrence of interplate seismic events in southern mexico,

  Nobuaki Suenaga, Yingfeng Ji, YOSHIOKA SHOICHI, Maria Manea, Vlad C. Manea

  Annual Meeting 2016, Nov. 2016, English, Puerto Vallarta, Mexico, International conference

  Oral presentation


• Slab dehydration, thermal regime, the distribution of tectonic tremors and seismicity beneath Hikurangi

  Yingfeng Ji, YOSHIOKA SHOICHI

  日本地震学会秋季大会, Oct. 2016, English, 愛知, Domestic conference

  Oral presentation


• Three-dimensional numerical modeling of temperature and dehydration fields associated with subduction of the Philippine Sea plate, southwest Japan,

  Shoichi Yoshiooka, Yingfeng Ji, Takumi Matsumoto

  35rd General Assembly of the European Seismological Commission, Sep. 2016, English, Trieste, Italy,, International conference

  Oral presentation


• Three-dimensional numerical modeling of temperature and dehydration associated with subduction of the Philippine Sea plate, southwest Japan,

  Shoichi Yoshiooka, Yingfeng Ji, Takumi Matsumoto

  The 1st Asia-Pacific Workshop on Lithosphere and Mantle Dynamics, Sep. 2016, English, Taipei, International conference

  [Invited]

  Invited oral presentation


• 3D thermal convection modeling associated with subduction of the Cocos plate in southern Mexico - Effects of trench retreat on temperature and flow fields -,

  Nobuaki Suenaga, Yingfeng Ji, Shoichi Yoshioka, Vlad C. Manea, Maria Manea

  Joint Workshop on Slow Earthquakes 2016, Sep. 2016, English, 東京, Domestic conference

  Poster presentation


• Geo-fluids distribution in mantle inferred from the electrical conductivity and simulated thermal

  Maki Hata, Makoto Uyeshima, Shoichi Yoshioka, Nobuaki Suenaga, Takumi Matsumoto

  23rd Electromagnetic Induction Workshop, Aug. 2016, English, ChiangMai, Thailand,, International conference

  Oral presentation


• Slab Dehydration, Interplate Hydrousity and Seismic Distribution in Modeling deformation, faulting, and mountain building in the island-arc crust of northeastern and central Japan considering heterogeneous thermal structure

  Yingfeng Ji, Shoichi Yoshioka

  Crustal Dynamics 2016, Jul. 2016, English, 岐阜, Domestic conference

  Poster presentation


• Mapping Crustal Structure Change in Tohoku With Time-Varying P-to-S Receiver Functions

  Robert W. Porritt, Shoichi Yoshioka

  Crustal Dynamics 2016, Jul. 2016, English, 岐阜, Domestic conference

  Poster presentation


• 九州地方の電気伝導度構造と温度構造から求められたマントルの流体分布

  HATA MAKI, UESHIMA MAKOTO, YOSHIOKA SHOICHI, SUENAGA NOBUAKI

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 千葉, Domestic conference

  Oral presentation


• Three-dimensional numerical modeling for subduction thermal regime, slab dehydration, and mantle flow beneath Kanto to Tohoku, Japan,

  Yingfeng Ji, Shoichi Yoshioka

  日本地球惑星科学連合2016年大会, May 2016, English, 千葉, Domestic conference

  Poster presentation


• Subduction of oceanic plate irregularities in Mexico and Japan and the influence on large megathrust earthquakes,

  Marina Manea, Vlad C. Manea, Shoichi Yoshioka

  日本地球惑星科学連合2016年大会, May 2016, English, 千葉, Domestic conference

  Poster presentation


• Three-dimensional thermal modeling associated with subduction of the Philippine Sea plate, southwest Japan

  YOSHIOKA SHOICHI, Yingfeng Ji, Takumi Matsumoto

  AGU Chapman Conference on the Slow Slip Phenomena, Feb. 2016, English, Ixtapa, Mexico, International conference

  Poster presentation


• Three-dimensional thermal modeling associated with subduction of the Cocos plate beneath southern Mexico, and its relationship to the occurrence of interplate seismic events

  Nobuaki Suenaga, Yingfeng Ji, YOSHIOKA SHOICHI

  AGU Chapman Conference on the Slow Slip Phenomena, Feb. 2016, English, Ixtapa, Mexico, International conference

  Poster presentation


• Seismic distribution and dehydration of MORB associated with subduction of the Pacific and the Philippine Sea plates beneath the Tohoku and Kanto districts, Japan

  Yingfeng Ji, YOSHIOKA SHOICHI

  AGU Chapman Conference on the Slow Slip Phenomena, Feb. 2016, English, Ixtapa, Mexico, International conference

  Poster presentation


• A Study of Low-Frequency Earthquake Magnitudes in Northern Vancouver Island

  Lindsay Yuling Chuang, Michael G Bostock, YOSHIOKA SHOICHI

  AGU Chapman Conference on the Slow Slip Phenomena, Feb. 2016, English, Ixtapa, Mexico, International conference

  Poster presentation


• Crustal structure in the Tohoku region before and after the Tohoku-Oki earthquake with P to S receiver functions

  Robert W Porritt, YOSHIOKA SHOICHI

  AGU Fall Meeting 2015, Dec. 2015, English, San Francisco, International conference

  Poster presentation


• A Study of Low-Frequency Earthquake Magnitudes in Northern Vancouver Island

  Lindsay Yuling Chuang, Michael G Bostock, YOSHIOKA SHOICHI

  AGU Fall Meeting 2015, Dec. 2015, English, San Francisco, International conference

  Poster presentation


• Impact of olivine-spinel phase change kinetics on the deformation of the Mariana Slab

  YOSHIOKA SHOICHI, Michael R. Riedel

  GeoBerlin 2015, Oct. 2015, English, Berlin, International conference

  Oral presentation


• 東北地方太平洋沖地震の地震前・地震時・地震後の固着状態とすべり分布の推定

  YOSHIOKA SHOICHI

  地殻ダイナミクス －東北沖地震後の内陸変動の統一的理解－2015年研究集会, Sep. 2015, Japanese, 宮城, Domestic conference

  Oral presentation


• Temperatures and fault slips on the upper surface of the subducting Philippine Sea plate beneath the Kanto district, central Japan

  YOSHIOKA SHOICHI, Rumi Takagi, Takumi Matsumoto

  IUGG XXVI 2015,IUGG-1469, Jun. 2015, English, Prague, International conference

  Oral presentation


• 3-D thermal modeling associated with subduction of the Philippine Sea plate in southwest Japan.

  YOSHIOKA SHOICHI, Yingfeng Ji, Takumi Matsumoto

  Central Asian tectonics and Western Pacific Geodynamics international workshop, Jun. 2015, English, Wuhan, International conference

  Oral presentation


• 2D and 3D thermal modeling associated with subduction of the Philippine Sea plate in central and southwest Japan

  YOSHIOKA SHOICHI, Yingfeng Ji, Takumi Matsumoto

  東京大学地震研究所共同利用研究集会, May 2015, Japanese, 東京, Domestic conference

  Oral presentation


• Spatiotemporal slip distributions of four long-term slow slip events beneath the Bungo Channel, southwest Japan, inferred from inversion analyses of GPS data

  Shoichi Yoshioka, Yoshiko Matsuoka, Satoshi Ide

  Tectonic Tremor and Silent Seismicity - 2015 International Workshop, Feb. 2015, English, Mexico City, International conference

  Oral presentation


• Impact of Phase Change Kinetics on the Mariana Slab Within the Framework of 2-D Mantle Convection

  Michael Riedel, Shoichi Yoshioka, Yoku Torii

  AGU fall meeting, Dec. 2014, English, San Francisco, International conference

  Poster presentation


• Relations among temperature, dehydration of the PHS plate, and the three seismic events in the Tokai district

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto

  Joint Workshop on Slow earthquakes: "The prospects for studies of slow earthquakes toward Nankai Megaquake predict ions and disaster preventions", Sep. 2014, English, 京都, International conference

  Oral presentation


• Relationships among temperature, dehydration, and the occurrence of a megathrust earthquake, LFEs, and a SSE in the Tokai region, central Japan

  Nobuaki Suenaga, Shoichi Yoshioka, Takumi Matsumoto

  AOGS 2014, Aug. 2014, English, 札幌, International conference

  Oral presentation


• 3D thermal modeling associated with subduction of the Philippine Sea plate in southwest Japan

  Shoichi Yoshioka, Yingfeng Ji, Takumi Matsumoto

  IASPEI-LACSC, Jul. 2014, English, Bogota, Colombia, International conference

  Oral presentation


• 東海地域におけるフィリピン海プレートの沈み込みに伴う温度場・脱水と想定東海地震・SSE・LFEとの関連性

  末永 伸明, YOSHIOKA SHOICHI, 松本 拓己

  日本地球惑星科学連合2014年大会, May 2014, Japanese, 横浜, Domestic conference

  Poster presentation


• Thermal modeling associated with subduction of the Philippine Sea plate in southwest Japan

  Shoichi Yoshioka, Yingfeng Ji, Takumi Matsumoto

  Geoscience Union Meeting 2014, Apr. 2014, English, 横浜, International conference

  Oral presentation


• 3D numerical modeling of thermal regime and mantle flow associated with subduction of the two oceanic plates, Japan

  Yingfeng Ji, Shoichi Yoshioka

  Geoscience Union Meeting 2014, Apr. 2014, English, 横浜, International conference

  Oral presentation


• 豊後水道下で発生する長期的スロースリップイベントについて

  YOSHIOKA SHOICHI, 松岡 美子

  平成25年度研究集会, Feb. 2014, Japanese, 東京, Domestic conference

  Oral presentation


• 東海地域におけるフィリピン海プレートの沈み込みに伴う温度場・脱水と想定東海地震・SSE・LFEとの関連性

  末永 伸明, YOSHIOKA SHOICHI, 松本 拓己

  平成25年度研究集会, Feb. 2014, Japanese, 東京, Domestic conference

  Poster presentation


• Slip distributions of three slow slip events beneath the Bungo Channel,southwest Japan,inferred from new inversion analyses of GPS data

  Shoichi Yoshioka, Yoshiko Matsuoka

  AGU fall meeting, Dec. 2013, English, San Francisco, International conference

  Poster presentation


• 豊後水道下で発生した長期的スロースリップイベントについて

  YOSHIOKA SHOICHI, 松岡 美子

  日本地震学会2013年度秋季大会, Oct. 2013, Japanese, 横浜, Domestic conference

  Oral presentation


• 東北地方の三次元P波減衰構造と島弧マグマ活動

  中島淳一, 羽田周平, 速水絵里圭, 内田直希, 長谷川昭, YOSHIOKA SHOICHI, 松澤暢, 海野徳仁

  日本地震学会2013年度秋季大会, Oct. 2013, Japanese, 横浜, Domestic conference

  Oral presentation


• 東海地域におけるフィリピン海プレートの沈み込みに伴う温度場の数値シュミレーション

  末永 伸明, YOSHIOKA SHOICHI, 松本 拓己

  日本地震学会2013年度秋季大会, Oct. 2013, Japanese, 横浜, Domestic conference

  Poster presentation


• 西日本におけるプレート境界面の摩擦係数と放射性元素の空間分布が地殻熱流量に与える影響

  季 頴鋒, YOSHIOKA SHOICHI, 松本 拓己

  日本地震学会2013年度秋季大会, Oct. 2013, Japanese, 横浜, Domestic conference

  Poster presentation


• 差分法を用いたマルチスケール動的断層破壊シュミレーションの試み

  金野 圭祐, YOSHIOKA SHOICHI

  日本地震学会2013年度秋季大会, Oct. 2013, Japanese, 横浜, Domestic conference

  Poster presentation


• Slip distributions of three slow slip events beneath the Bungo Channel,southwest Japan,inferred from inversion analyses of GPS data

  Shoichi Yoshioka, Yoshiko Matsuoka

  IAHS-IAPSO-IASPEI, Jul. 2013, English, Gottenberg, International conference

  Oral presentation


• Three-dimensional numerical simulations of temperature, fluid flow and heat flow associated with subduction of the Philippine Sea plate beneath southwest Japan,

  Yingfeng Ji, Shoichi Yoshioka, Takumi Matsumoto

  AOGS Annual Meeting, Jun. 2013, English, Brisbane, International conference

  Oral presentation


• 断層のステップ部における動的破壊の相互作用の数値シミュレーション

  金野 圭祐, YOSHIOKA SHOICHI

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉, Domestic conference

  Poster presentation


• 西南日本におけるフィリピン海プレートの沈み込みに伴う温度・流れ・地殻熱流量の３次元数値モデリング

  季 頴鋒, YOSHIOKA SHOICHI, 松本 拓己

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉, Domestic conference

  Poster presentation


• 曲面スラブの沈み込みに伴う温度場・流れ場・地殻熱流量の３次元数値モデリング

  季 頴鋒, YOSHIOKA SHOICHI

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉, Domestic conference

  Poster presentation


• 2012年12月7日三陸沖地震に伴う津波の数値シミュレーション

  青木 朝美, YOSHIOKA SHOICHI, 金野 圭祐

  日本地球惑星科学連合2013年大会, May 2013, Japanese, 千葉, Domestic conference

  Poster presentation


• Stress perturbation given on the Mount Fuji Valcano Magma System caused by the Tohoku Megathrust Earthquake, Japan

  Fujita Eisuke, Kozono Tomofumi, Ozawa Taku, Ueda Hideki, Kohno Yuhki, Yoshioka Shoichi, Toda Norio, Kikuchi Aiko, Ida Yoshiaki

  AGU 20121 fall meeting, Dec. 2012, English, Americal Geophysical Union, San Francisco, USA, International conference

  Oral presentation


• Along strike variation of tremor activities and thermal structures in various subduction zones

  Suguru Yabe, Satoshi Ide, Shoichi Yoshioka

  AGU fall meeting, Dec. 2012, English, AGU, San Francisco, International conference

  Oral presentation


• 東北地方太平洋沖地震による富士山影響評価

  藤田 英輔, 小園 誠史, 小澤 拓, 上田 英樹, 河野 裕希, 吉岡 祥一, 戸 田則雄, 菊池 愛子, 井田 喜明

  日本火山学会2012年度秋季大会, Oct. 2012, Japanese, 日本火山学会, 御代田, Domestic conference

  Oral presentation


• 沈み込み帯における深部微動と温度の関係

  矢部 優, 井出 哲, 吉岡 祥一

  日本地震学会2012年度秋季大会, Oct. 2012, Japanese, 日本地震学会, 函館, Domestic conference

  Oral presentation


• 曲面スラブの沈み込に伴う温度場・流れ場・地殻熱流量の3次元数値シミュレーション

  季 頴鋒, 吉岡 祥一

  日本地震学会2012年度秋季大会, Oct. 2012, Japanese, 日本地震学会, 函館, Domestic conference

  Poster presentation


• 関東地方下と東北地方下の温度構造から推定した太平洋プレート上面の温度プロファイルと含水量

  高木 瑠美, 吉岡 祥一

  日本地震学会2012年度秋季大会, Oct. 2012, Japanese, 日本地震学会, 函館, Domestic conference

  Poster presentation


• 環太平洋地域の沈み込み帯におけるプレートの斜め沈み込みとその地域で発生する逆断層型地震のすべり方向のずれ

  片山 直子, 吉岡 祥一

  日本地震学会2012年度秋季大会, Oct. 2012, Japanese, 日本地震学会, 函館, Domestic conference

  Poster presentation


• Tremor activities and thermal structures in various subduction zones

  Suguru Yabe, Satoshi Ide, Shoichi Yoshioka

  ECGS Workshop 2012, Oct. 2012, English, ECGS, Luxembourg, International conference

  Poster presentation


• 3次元スタガード格子差分法による自発的断層破壊と地震動のシミュレーション

  金野 圭祐, 吉岡 祥一

  日本地震学会2012年度秋季大会, Oct. 2012, Japanese, 日本地震学会, 函館, Domestic conference

  Oral presentation


• Numerical simulations of temperature fields associated with subduction of the oceanic plates beneath Tohoku and Kanto districts

  Rumi Takagi, Shoichi Yoshioka, Takumi Matsumoto

  The 9th Asian Seismological Commission General Assembly 2012, Sep. 2012, English, Asian Seismological Commission, Ulaanbaatar, International conference

  Oral presentation


• 東北地方と関東地方におけるプレートの沈み込みに伴う温度分布の数値シミュレーション

  高木 瑠美, 吉岡 祥一, 松本 拓己

  日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Poster presentation


• 地球物理学と物質科学に基づくポスト・スピネル転移に対する制約:トンガスラブの例

  金嶋 聰, 久保 友明, 吉岡 祥一

  日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• ニュージーランド北島におけるテクトニックな微動活動と温度構造

  矢部 優, 井出 哲, 吉岡 祥一

  日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Poster presentation


• ココスプレートの沈み込み方向と中央アメリカ海溝で発生する逆断層型地震のすべり角の方向のずれ

  片山 直子, YOSHIOKA SHOICHI

  日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Poster presentation


• Towards comprehensive modeling of earthquake process in Nankai subduction zone

  Ide Satoshi, Yoshioka Shoichi, Shibazaki Bunichiro, Hori Takane, Ito Yoshihiro, Kame Nobuki, Ando Ryosuke, Mochizuki Kimihiro, Suzuki Takehito

  International Conference on a New Perspective of Great Earthquakes along Subduction Zones, Feb. 2012, English, 文部科学省科研費新学術領域研究会KANAME, 高知, International conference

  Oral presentation


• Numerical simulations on temperature fields associated with subduction of the Philippine Sea plate in Southwest Japan

  Yoshioka Shoichi, Suminokura Yoichiro, Matsumoto Takumi, Nakajima Junichi

  International Conference on a New Perspective of Great Earthquakes along Subduction Zones, Feb. 2012, English, 文部科学省科研費新学術領域研究会KANAME, 高知, International conference

  Oral presentation


• 2-D numerical simulations on temperature fields associated with subduction of the Philippine Sea plate in Southwest Japan

  Yoshioka Shoichi, Suminokura Yoichiro, Matsumoto Takumi, Nakajima Junichi

  AGU 2011 fall meeting, Dec. 2011, English, Americal Geophysical Union, San Francisco, USA, International conference

  Oral presentation


• 豊後水道で発生する長期的スロースリップイベントについて

  松岡 美子, 吉岡 祥一

  日本地震学会2011年秋季大会, Oct. 2011, Japanese, 日本地震学会, 静岡, Domestic conference

  Oral presentation


• 過去6000年間の三陸沖超巨大古津波履歴を示す二つの露頭

  平川 一臣, 吉岡 祥一, 中村 衛, 西川 由香

  日本地震学会2011年秋季大会, Oct. 2011, Japanese, 日本地震学会, 静岡, Domestic conference

  Oral presentation


• 伊勢湾付近の深部低周波地震の空白域について

  末永 伸明, 吉岡 祥一

  日本地震学会2011年秋季大会, Oct. 2011, Japanese, 日本地震学会, 静岡, Domestic conference

  Oral presentation


• ニュージーランド南島で発生した2010年Darfield地震と2011年クライストチャーチ地震による被害

  吉岡 祥一, 太田 陽子, 片岡香子

  日本地震学会2011年秋季大会, Oct. 2011, Japanese, 日本地震学会, 静岡, Domestic conference

  Oral presentation


• 2-D Numerical Simulations on Temperature Fields Associated with Subduction of the Philippine Sea Plate in Southwest Japan

  Yoshioka Shoichi, Suminokura Yoichiro, Matsumoto Takumi, Nakajima Junichi

  Asia Oceania Geosciences Society 8th Annual Meeting 2011, Aug. 2011, English, Asia Oceania Geosciences Society, Taipei, Taiwan, International conference

  Oral presentation


• 津波はリアス式海岸で増幅したのか? -現地調査による湾内津波の挙動-

  中村 衛, 吉岡 祥一, 平川 一臣, 西川 由香

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• 太平洋プレートとフィリピン海プレートの沈み込みによる関東下の温度分布の数値シミュレーション

  高木 瑠美, 吉岡 祥一, 松本 拓己

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• 下部マントルへのスタグナントスラブ崩落の数値シミュレーション

  吉岡 祥一, 永野田 彩

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• いかにして巨大津波から避難したか? ~陸前高田市におけるインタビュー調査からの考察(序報)~

  林 能成, 水木 千春, 安藤 雅孝, 石田 瑞穂, 吉岡 祥一

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• 2011年3月15日静岡県東部で発生した地震(Mjma6.4)による富士山マグマ溜まりへの影響評価

  藤田 英輔, 小園 誠史, 上田 英樹, 小澤 拓, 吉岡 祥一, 戸田 則雄, 菊池 愛子, 井田 喜明

  日本地球惑星科学連合2011年大会, May 2011, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• Numerical simulations on fall of stagnant slabs into the lower mantle

  Yoshioka Shoichi, Naganoda Aya

  EGU2011, Apr. 2011, English, European Geosciences Union, Vienna, Austria, International conference

  Oral presentation


• Direct imaging of the metastable olivine wedge for a deep dry cold slab beneath southwest Japan

  Kawakatsu Hitoshi, Yoshioka Shoichi

  第890回地震研究所談話会, Jan. 2011, Japanese, 東京大学地震研究所, 東京, Domestic conference

  Oral presentation


• Effects of trench migration on fall of stagnant slabs into the lower mantle

  Yoshioka Shoichi, Naganoda Aya

  AGU 2010 fall meeting, Dec. 2010, English, Americal Geophysical Union, San Francisco, USA, International conference

  Oral presentation


• 2-D thermal modeling of the Philippine Sea plate in southwest Japan -effects of hot plume, yield stress, and surface erosion-

  Suminokura Yoichiro, Yoshioka Shoichi, Matsumoto Takumi, Nakajima Junichi

  The 8th ASC General Assembly 2010, Nov. 2010, English, Asian Seismological Commission, Hanoi, Vietnam, International conference

  Oral presentation


• 2D temperature model in deep slabs incorporating kinetics and latent heat release associated with the phase transformations

  Yoshioka Shoichi, Torii Yoku, Kubo Tomoaki, Riedel Michael R, Kawakatsu Hitoshi

  The 8th ASC General Assembly 2010, Nov. 2010, English, Asian Seismological Commission, Hanoi, Vietnam, International conference

  Oral presentation


• 西南日本におけるフィリピン海プレートの沈み込みの2次元温度モデリング~ホットプリューム、降伏応力、削剥の効果~

  隅倉 陽一郎, 吉岡 祥一, 松本 拓己, 中島 淳一

  日本地震学会2010年秋季大会, Oct. 2010, Japanese, 日本地震学会, 広島, Domestic conference

  Oral presentation


• GPS データを用いた西南日本のすべり欠損分布の推定~プレート形状,観測点配置の影響~

  松岡 美子, 吉岡 祥一

  日本地震学会2010年秋季大会, Oct. 2010, Japanese, 日本地震学会, 広島, Domestic conference

  Oral presentation


• 2D temperature model in deep slabs incorporating kinetics of the 410-km and 660-km phase transformations

  Yoshioka Shoichi, Torii Yoku, Kubo Tomoaki, RiedelMichael R, Kawakatsu Hitoshi

  The Meeting of the Americas, Aug. 2010, English, Americal Geophysical Union, Foz do Iguassu, Brasil, International conference

  Oral presentation


• 西南日本におけるフィリピン海プレートの沈み込みに伴う温度分布の数値シミュレーション

  隅倉 陽一郎, 吉岡 祥一, 松本 拓己, 中島 淳一

  日本地球惑星科学連合2010年大会, May 2010, Japanese, 日本地球惑星科学連合, 千葉, Domestic conference

  Oral presentation


• Numerical simulations of temperature distributions associated with subduction of the Philippine Sea plate, southwest Japan,

  Yoshioka Shoichi, Suminokura Yoichiro, Matsumoto Takumi, Nakajima Junichi

  EGU2010, May 2010, English, European Geosciences Union, Vienna, Austria, International conference

  Oral presentation

• Seismological Society of Japan


• American Geophysical Union


• アメリカ地球物理学連合


• 日本地震学会

• プレート境界・内陸活断層のモデル化及び３次元粘弾性媒質中 での応力伝播の並列シミュレーション・モデル化に関する研究

  1998 - 2003


• 南海トラフにおける海溝型巨大地震災害軽減のための地震発生機構のモデル化・観測シス テム高度化に関する総合研究

  1996 - 2001

• Slow-to-Fast earthquakes through comparison across global subduction zones

  伊藤 喜宏, 宮崎 真一, 前田 裕太, 吉岡 祥一, 石川 剛志, 矢部 優, 氏家 恒太郎, 望月 公廣

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Transformative Research Areas (A), Kyoto University, 10 Sep. 2021 - 31 Mar. 2026


• Why do intra-slab earthquakes occur ? Relationship with the three-dimensional distribution of olivine metastable phase, temperature, and dehydration

  吉岡 祥一, 中島 淳一

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2021 - 31 Mar. 2025

  研究の目的と研究実施計画は以下の通りである。 ・研究の目的：深さ200～500 kmで発生するスラブ内地震に関して、以下の５項目を本研究の目的とし、吉岡と中島で分担・協力して、研究を遂行する。 ・研究実施計画：① 地震発生メカニズムの包括的理解に不可欠な同一のスラブにおける地震の震源パラメターの系統的な深さ変化の解明（中島） ② 太平洋スラブ内のオリビン準安定相領域の3次元空間分布の特定（中島・吉岡） ③ オリビン準安定相の存在を考慮したスラブ深部の3次元温度分布を計算するコードの開発（吉岡） ④ 太平洋スラブ深部の3次元温度分布・含水量分布の推定（吉岡） ⑤脱水脆性化説、相転移断層説、熱的不安定説の特定（吉岡・中島） 上記①、②に関しては、昨年度までにほぼ実施が完了した。 吉岡は、上記③に関して、2次元鉛直断面内で海洋プレートの沈み込みに伴うオリビンからウォズレアイトの相転移のカイネティクスを取り入れたプログラムのチューニングを行い、中部地方下の太平洋スラブに適用し、数値モデリングを実施する準備を整えた。 中島は、遠地地震を用いたレシーバー関数解析プログラムコードを新規に作成し、日本列島下の太平洋スラブの深部構造およびマントル遷移層不連続面の空間変化を調査した。その結果、太平洋スラブの上部境界面付近に正の振幅をもつ地震波不連続面が連続的に存在すること、その不連続面は410km不連続面に繋がるようにみえること、スラブ下（裏側）の410km、660km不連続面はほぼフラットであることが明らかになった。これらの結果は、含水相の相転移の深さ、マントル対流の温度異常などの情報を含んでいると考えられる。次年度では解析のイメージング精度の向上を目指しつつ結果の解釈を行い、スラブの相転移と深発地震の関係、およびスラブ下に存在すると考えられているマントル上昇流の原因を考察する。


• Why do intra-slab earthquakes occur ? Relationship with the three-dimensional distribution of olivine metastable phase, temperature, and dehydration

  吉岡 祥一, 中島 淳一

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2021 - 31 Mar. 2025


• Study on Geoscientific Modeling of Earthquake Phenomena from Low-speed Deformation to High-speed Slip

  Ide Satoshi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), The University of Tokyo, 30 Jun. 2016 - 31 Mar. 2021

  Through geoscientific modeling, we conducted research to elucidate the principles of slow earthquakes. Specifically, the research was divided into three parts: (A) clarification of the temporal and spatial relationships among slow earthquake phenomena, (B) modeling in realistic plate tectonic systems, and (C) investigation of the predictability of plate motion including giant earthquakes. In (A), we made a major contribution to understanding the relationship between apparently different phenomena, focusing on the clarification of the broadband picture of slow earthquakes. In (B), we developed various models incorporating realistic factors such as heat, water, and multiple faults. In (C), experimental studies were particularly advanced, and a major achievement was the understanding of the two-dimensional growth of the rupture nucleus. We also obtained clues for new research directions using machine learning.


• 日本下のプレート沈み込みとマントルウェッジの温度場・水輸送・異方性のダイナミクス

  吉岡 祥一

  科学研究費補助金／基盤研究(B), Apr. 2016 - Mar. 2020, Principal investigator

  Competitive research funding


• 東北地方太平洋沖地震の地震前・地震時・地震後の固着状態とすべり分布の推定

  吉岡 祥一

  科学研究費補助金／新学術領域研究, Apr. 2015 - Mar. 2017, Principal investigator

  Competitive research funding


• 【JST-SATREPS】メキシコ沿岸部の巨大地震・津波災害の軽減に向けた総合的研究

  吉岡 祥一

  国立研究開発法人科学技術振興機構, 国際科学技術共同研究推進事業 地球規模課題対応国際科学技術協力プログラム（SATREPS), 2017, Principal investigator

  Competitive research funding


• 【JST-SATREPS】メキシコ沿岸部の巨大地震・津波災害の軽減に向けた総合的研究

  吉岡 祥一

  国際科学技術共同研究推進事業 地球規模課題対応国際科学技術協力プログラム（SATREPS), 2016, Principal investigator

  Competitive research funding


• スラブ沈み込みに伴う日本列島下の温度分布・物質循環と地震学的微細構造の関連性

  吉岡 祥一

  科学研究費補助金／基盤研究(B), Apr. 2010 - Mar. 2015, Principal investigator

  Competitive research funding


• Comprehensive modeling of pre- and co-seismic processes

  IDE Satoshi, HORI Takane, YOSHIOKA Shoichi, SHIBAZAKI Bunichiro, ITO Yoshihiro, KAME Nobuki, MOCHIZUKI Kimihiro, ANDO Ryosuke, SUZUKI Takehito

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), The University of Tokyo, 23 Jul. 2009 - 31 Mar. 2014

  We studied inter-, pre-, and co-seismic process of mega-quake in the Nankai subduction zone. The main topics are (A) slow deformation on the shallow plate interface around accretionary prism, (B) dynamic rupture in geometrically complex fault system, and (C) earthquake cycle including preparation stage of a mega-quake. We successfully constructed a new comprehensive model for physical processes of mega-earthquakes in subduction zone, in a wide frequency range, through the modeling of slow earthquakes and the 2011 Tohoku-Oki earthquake.


• Stagnant Slab : A Key Word for the Mantle Dynamics

  FUKAO Yoshio, UTADA Hisashi, KASAHARA Minoru, SUETSUGU Daisuke, KANAZAWA Toshihiko, IRIFUNE Tetsuo, OHTANI Eiji, HAMANO Yozo, YOSHIOKA Shoichci, KAWAKATSU Hitoshi, SHIOBARA Hajime, KASAHARA Minoru, SUETSUGU Daisuke, KANAZAWA Toshihiko, IRIFUNE Tetsuo, NISHIYAMA Norimasa, OHTANI Eiji, HAMANO Yozo, YOSHIOKA Shoichi, KAWAKATSU Hitoshi, SHIOBARA Hajime

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas, Japan Agency for Marine-Earth Science and Technology, 2004 - 2009

  本年度は、以下の研究を実施した。 1. 平成21年7月16日に通算第9回目の総括班会議を開き、これまでの各計画研究の成果の状況を再確認し、領域全体の研究のとりまとめの方向および役割分担を議論した。 2. 欧文国際誌Physics of Earth Planetary Interiorに特集号の投稿受け付けを、前年度に開始して平成21年8月31日に締め切った。本研究領域からだけではなく、海外からも含め、37篇の論文が投稿された。平成22年度中に刊行される予定で査読が進められている。特集号「Deep Slab and Mantle Dynamics」のゲスト編集者は、末次大輔(海洋研究開発機構)、井上徹(愛媛大学地球深部ダイナミクス研究センター)、Craig Bina(米国ノースウェスタン大学)、Douglas Wiens(米国ワシントン大学)の4名であり、末次、井上が特定領域研究に参加した研究者である。論文の分野内訳は、マントル対流モデリングの論文が10篇、高温高圧鉱物学の論文が13篇、地震学・地球電磁気学など地球物理学の論文が14篇と、特定領域研究がカバーする広い学問分野にわたっている。学問分野をまたいだ論文も数多く投稿されており、特定領域研究の特徴がよく表れている。現在、15篇の採否が決定されており、残りも含めて平成22年度中には刊行される予定で編集作業が進められている。 3. 平成22年1月24日(日)に、地震研究所を会場にしてサイエンスカフェ「プレートのゆくえ」を開催した。深尾領域代表者による講演に引き続き、40数名の参加者との活発な質疑応答が行なわれ、盛況であった。 4. 平成21年3月に領域の成果をとりまとめた報告書(冊子体)を印刷した。また、領域の成果をわかりやすく書き下ろした一般向け印刷物「プレートのゆくえ」を刊行した。記事の執筆には、早稲田大学大学院政治学研究科の吉戸智明氏および大学院生の協力を得た。


• スタグナントスラブの形成及び崩落過程の解明

  2003 - 2009

  Competitive research funding


• Numerical modeling of formation and collapse processes of stagnat slabs

  2003 - 2009

  Competitive research funding


• Modeling of stagnation/falling processes by downward flow

  SHOICHI Yoshioka, TOMOEKI Nakakuki, ATSUSHI Suzuki, MASANORI Kameyama, MASAHISA Tabata, TAKASHI Nakagawa, YASUYUKI Iwase

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas, Kyushu University, 2004 - 2008

  本研究では、主として、3次元箱型、2次元箱型の熱対流を用いたスラブ沈み込みモデルを構築した。3次元箱型モデルでは、高速な数値解法アルゴリズムの開発を進め、海洋プレートの沈み込みを実現し、410km、660kmでの相転移、660kmでの粘性ジャンプ、粘性率の温度・圧力依存性、海溝の後退などをモデルに取り入れた。数値シミュレーションの結果、滞留スラブの形成には海溝の後退が重要であることを示した。2次元モデルでは、プレートに強制的な沈み込み速度を与えるモデルと、自発的にプレートが沈み込むモデルを構築した。前者では、海溝の後退がある場合、660kmでの相転移によってスラブを浮かせるモードと下部マントルの高粘性によってスラブを支えるモードがあることを示した。また、海溝後退によって生成された滞留スラブが、下部マントルへと崩落するメカニズムとして、海溝後退の停止や前進が重要であることを示した。後者のモデルでは、マントル遷移層でのスラブの振る舞いと地表のテクトニクスの相互作用を扱うことを可能にし、様々な構造を持つ滞留スラブを再現した。また、滞留スラブの形成には、海溝の後退が非常に重要であり、滞留・崩落の過程には、2つの様式があることを明らかにした。


• SEISMOLOGICAL ANALYSIS AND NUMERICAL SIMULATION FOR THE MANTLE STRUCTURE WITH SUBDUCTED SLAB

  TAJIMA Fumiko, YOSHIOKA Shoichi, NAKAKUKI Tomoeki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Hiroshima University, 2004 - 2006

  Broadband seismic waveform analyses were carried out to study the structure associated with stagnant slab (SS) in the northwestern Pacific. The region of model M3.11 with high velocity anomaly (HVA) and the 660 km discontinuity depth depression is bounded by zones that are delineated by model M2.0 with HVA but without depression of the discontinuity. The structural change is associated with the geochemical properties of SS where the contrast of a hydrous garnet rich layer versus a bulk of peridotite involves. Anomalously broadened P waveforms of deep focus events were observed at some regional stations after sampling the region with SS. The rays of the anomalous waves propagated in the vicinity of the regions which are modeled with M3.11 or M2.0. The broadened P waveforms may be SV converted waves within an anomalous narrow zone near the "660 km" discontinuity. The creation of such heterogeneities may involve in the complex structure of phase transformation with water and cold temperature anomaly with SS. Numerical simulations were also performed to test various physical conditions associated with SS. To explain formation process of SS, effects of adiabatic compression, viscous dissipation, and trench retreat were incorporated into a 2-D thermal-fluid flow numerical model to clarify the roles of various factors on formation process of SS. We also developed a 2-D numerical model incorporating spatio-temporal variations of physical properties such as density and viscosity, and a method of calculation for temperature distribution of subducting slab with arbitrary shape. Using the model, we tested conditions to cause depression of the 660 km discontinuity, by calculating temperature distribution along a profile across the Japanese islands where seismic velocity structure has been well determined using receiver functions and seismic tomography.


• フィリピン海スラブの沈み込みに伴う温度・速度構造とスラブ内地震・地表変形の地域性

  吉岡 祥一

  日本学術振興会, 科学研究費助成事業, 基盤研究(C), 九州大学, 2002 - 2004

  1.熱と流れの3次元プログラムの開発・モデル化 熱と流れの2次元差分プログラムを基に、3次元箱型モデルの差分プログラムを完成させた。パラメターの無次元化、プログラムの並列化・高速化、計算結果の描画プログラムの開発などを行った。このプログラムを用いて、西南日本において、フィリピン海プレートの過去の沈み込み様式、斜め沈み込み、紀南海山列からの距離の違いによる異なる温度境界条件などを考慮した熱と流れの3次元沈み込みモデルの構築を行った。観測された地殻熱流量と計算値の比較を行い、プレート上面の温度分布を新たに提案し、東南海・南海地震の地震発生域を推定することに成功した。 2.四国沖〜九州東部沖のプレート間カップリングの推定と地表変形の地域性の検討 九州において、GPSデータを用いたインヴァージョン解析により、日向灘におけるプレート間カップリングと九州地域の地殻変動の関連性を明らかにした。その結果、九州の地殻変動は、プレート間カップリングに加えて、別府-島原地溝帯の深部での右横ずれと、沖縄トラフの拡大に伴うプリュームによる南部での南東方向へのマントルドラッグにより説明できることがわかった。さらに、四国のGPSデータのインヴァージョンにより、四国沖でのプレート間カップリングを推定し、1968年日向灘地震(M7.5)や1946年南海地震(M8.1)の地震時のすべり領域と今回得られたプレート間カップリングの空間分布との関連性やこれらの地震の繰り返し間隔を推定した。


• 背弧下のプリュームの構造・ダイナミクスと背弧拡大のメカニズムの関連性

  吉岡 祥一

  日本学術振興会, 科学研究費助成事業, 奨励研究(A), 九州大学, 2000 - 2001

  背弧下の上部マントルを数百mごとの格子点に分割し、各格子点での深さからその点での圧力と温度分布を計算した。得られた背弧下での温度分布と、パイロライト組成に対する温度-圧力ダイヤグラムを用いて、すべての格子点での温度・圧力に対する密度、ヤング率、剛性率などの各種物性パラメターの値を計算し、背弧下の上部マントル内での物性パラメターの空間分布を求めた。その結果、背弧下の上昇するプリューム内の高温領域では、これらの物性値の値が小さくなることが見出された。また、相転移境界がプリュームの流れに及ぼす影響を定量的に評価し、相転移境界がある場合には、ない場合に比べて、660km直下でプリュームが妨げられ、横長の塊状になる形状を示すこと、プリューム域を除いては温度分布のパターンは両者で似ているが、相転移がある場合は、ない場合に比べてその時間的進行が遅れること、などが明らかになった。さらに、パイロライト組成を仮定し、背弧下の上部マントル内でP波・S波速度分布、及び地震波速度異常の空間分布を求め、P波、S波とも地震波速度分布と温度分布との対応がよく、低速度域は高温域に、高速度域は低温域に対応していること、P波よりもS波速度異常の方が値が大きいこと、などがわかった。また、背弧拡大モデルに対する流線から背弧下の上部マントル内での流れの速度分布の計算を行い、浅部ではプリューム域から離れるに従って速度ベクトルの向きが鉛直方向から水平方向に向いてくること、相転移境界がない場合でも、660km付近で反流が生じる可能性があることを示した。また、背弧におけるリソスフェア下部に働く剪断応力を計算し、現在の九州の南東向きのGPSデータを説明するためには、10〜20MPa程度の断応力が必要である可能性を示した。


• スラブ内部の相転移に伴う応力場と深発地震の発生の場との関連性

  吉岡 祥一

  日本学術振興会, 科学研究費助成事業, 奨励研究(A), 九州大学, 1997 - 1998

  本研究では、物性値の空間分布を考慮して、スラブ内の応力場の数値シミュレーションを行った。スラブ構成物質をオリビン(Mg0.89Fe0.11)2SiO4と仮定し、差分(FD)法を用いてスラブ内の温度分布を計算し、各タイムステップごとに物性値の空間分布を反映させた。スラブ内部の応力場に影響を与える要素として、スラブと周囲のマントルの密度差により生じる正・負の浮力、沈み込むスラブの上面・下面に働く剪断力、スラブ先端がマントルから受ける抵抗力、熱応力及び不均質体積変化により生じる応力を考慮し、有限要素法(FEM)を用いて弾性応力解析を行った。正・負の浮力に起因する応力は、α相内のdown.dip tension、γ相内に卓越するdown-dip compression、γ→Pv+Mw相転移境界付近のdown-dip tensionで特徴づけられ、最大剪断応力はオリビン準安定相境界及びγ相内深部に集中し30MPa程度を示した。剪断力に起因する応力場は、α相内では圧縮場が、γ相内ではdown-dip tensionが現れ、最大剪断応力の大きさは、数MPaと非常に小さかった。スラブ先端が受ける抵抗力に起因する応力場では、down-dip compressionが卓越し、最大剪断応力はスラブ先端部で最大値を示した。熱応力及び不均質体積変化により生じる応力は、各相転移境界で応力集中が見られた。深発地震発生数と解析結果のdown-dip方向の応力を比較した結果、正・負の浮力による応力が深発地震のピークと一致し、700km以深では最大剪断応力がゼロに近づき、サイスミシティが見られないことがうまく説明されることにより、考慮した5つの要素の中で最も良い一致を示すことがわかった。また、正・負の応力に起因する応力場とハーバード大学のグループによるCMT解との比較を試み、これについてもスラブと周囲のマントルの密度差による正・負の浮力が地震学的観測データを最もうまく説明する支配的な要素であると結論づけた。


• High Pressure Phase Transformations Down to the Lower Mantle Conditions and Implications for the Nature of the Seismic Discontinuities.

  IRIFUNE Tetsuo, YOSHIOKA Shoichi, INOUE Toru

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Ehime University, 1995 - 1997

  High pressure and high temperature experiments have been made on mantle materials using both quench method and in situ X-ray diffraction measurement. The phase transformations in a pyrolite composition were studied by the former method at pressures to 28 GPa and temperatures along a representative mantle geotherm.It was demonstrated that iron partitioning of the coexisting phases in this composition affects significantly the width of the pressure interval between the modified spinel and spinel phases of olivine, which is consistent with the nature of the 410km discontinuity revealed by the recent seismological studies. On the other hand, we presented some data on the partitioning of iron between perovskite and magnesiowustite under the lower mantle conditions, and showed that the iron partition coefficient approaches unity with increasing pressure as a result of the increase of aluminum in the perovskite phase. The sharpness of the 660km seismic is discussed on the basis of these experimental data. The phase boundary between spinel and the postspinel phase has been determined by in situ X-ray measurements using a combination of the synchrotron source (SPring-8) and a multianvil device. The boundary was determined at temperatures up to about 2000ﾟC,demonstrating that the postspinel phase boundary has a negative Clapeyron slope as estimated by quench experiments and thermodynamic analyzes. The boundary was located at about 21 GPa, at 1600ﾟC,which is about 2GPa lower than the earlier estimations based on other high pressure studies.


• 北西太平洋地域の地殼応力場の時間的変化と大地震発生の関連性

  吉岡 祥一

  日本学術振興会, 科学研究費助成事業, 奨励研究(特別研究員), 京都大学, 1990 - 1990


• 巨大地震に伴う粘弾性応答

  Competitive research funding


• Viscoelastic response associated with great earthquakes

  Competitive research funding