SEARCH
検索詳細
BRADAK-HAYASHI Balazs大学院海事科学研究科 海事科学専攻准教授
研究活動情報
■ 論文- 2025年10月, Quaternary研究論文（学術雑誌）
- Abstract This study investigates compound flooding on the Fugeshi River (Noto Peninsula, Japan) in the aftermath of the January 2024 Noto Peninsula earthquake (M7.6). The authors aimed to quantify the impacts of ground deformation on flooding, while integrating the historical evolution of the floodplain and potential climate change effects by simulating sea-level rise. The method is based on the analysis of aerial photographs (1947–2024), pre/post-earthquake LiDAR data, rainfall records (1944–2024), and 2D hydraulic modeling to identify flood vulnerability points from the LiDAR-derived DEMs pre- and post-earthquake. The main findings are that: (1) Rainfall intensity increased by 0.132 mm/year since 1944, with events > 14 mm/h rising by 1.4% over 70 years; (2) earthquake-induced ground deformation (1–3 m uplift) created new flooding patterns at the transition between artificially straightened downstream reaches and meandering upstream sections; (3) river modifications (1947–1965) established uneven flood protection, with smaller stopbanks upstream creating vulnerability points. In conclusion, the convergence of climate change–induced rainfall intensification, seismic ground deformation, and river engineering legacy effects amplifies flood hazards in coastal regions, highlighting the need for integrated multi-hazard flood management approaches.Springer Science and Business Media LLC, 2025年05月, Journal of Disaster Science and Management, 1(1) (1)研究論文（学術雑誌）
- In this article, desertification and dune progression over vegetation was quantified using remote sensing data. However, vegetation buried under sand blowout could not be counted using this method. Therefore, to estimate the extent of buried vegetation, a GPR campaign was conducted over the coastal sand-dune of Tottori Prefecture (Japan) in combination with a high-resolution topographic UAV-based survey of the topography. The results show that buried vegetation exists underneath sand-blowout, especially near the dune ridges, and can extend from 20 to 30 meters further than the estimate based on airborne remote sensing. Furthermore, the presence of palaeo-vegetation in palaeodune layers also provides the information on the long-term evolution of sand dunes, which can be used to reconstruct Quaternary coastal environments.Charles University in Prague, Karolinum Press, 2023年12月, AUC GEOGRAPHICA, 58(2) (2), 238 - 249, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2023年11月, Advances in Space Research, 72(9) (9), 4064 - 4073研究論文（学術雑誌）
- The Wispy Terrain is the region of chasmata characterized by quasi-parallel fault systems, formed by extensional and shear stresses of the icy crust of Dione, a moon of Saturn. Besides the basic, satellite-scale geological mapping and very general definition of the phenomenon, only a few studies focus on the Wispy Terrain and its chasmata from the angle of detailed tectonic reconstruction, with others mainly targeting, e.g., the timing of its formation. This study provides a detailed geological and cryotectonic analysis in the surroundings of the Eurotas and Palatine Chasmata and proposes additional, until now, unidentified tectonic processes and a formation model. The relationship between fragmentary impact craters and tectonic features indicates other newly suspected tectonic movements, namely thrust, and splay and décollement fault systems. In contrast to the commonly expected and identified dilatational processes, such fault types show compression and are characteristic of subduction in a terrestrial environment. Theoretically, the appearance of such tectonic processes means that the already-known rift and the newly discovered subsumption (subduction-like) processes may appear together in the Wispy Terrain. The appearance of both features may suggest the presence of some of the components (phases) of a Wilson cycle analog cryotectonic cycle (or possibly cycles) in icy planetary bodies like Dione.MDPI AG, 2023年10月, Remote Sensing, 15(21) (21), 5177 - 5177研究論文（学術雑誌）
- The study introduces a theory about an Evander-size impact on the surface of Dione. Our study suspects a relatively low-velocity (≤5 km/s) collision between a ca. 50–80 km diameter object and Dione, which might have resulted in the resurfacing of one of the satellite’s intermediate cratered terrains in various ways, such as surface planing by “plowing” by ricocheting ejectiles, ejecta blanket covering, partial melting, and impact-triggered diapir formation associated with cryotectonism and effusive cryo-slurry outflows. Modeling the parameters of an impact of such a size and mapping the potential secondary crater distribution in the target location may function as the first test of plausibility to reveal the location of such a collision, which may be hidden by younger impact marks formed during, e.g., the Antenor, Dido, Romulus, and Remus collision events. The source of the impactor might have been Saturn-specific planetocentric debris, a unique impactor population suspected in the Saturnian system. Other possible candidates are asteroid(s) appearing during the outer Solar System’s heavy bombardment period, or a collision, which might have happened during the “giant impact phase” in the early Saturnian system.MDPI AG, 2023年05月, Universe, 9(6) (6), 247 - 247研究論文（学術雑誌）
- MDPI, 2023年03月, A New Conference Journal, Proceedings, 1 - 1研究論文（国際会議プロシーディングス）
- MDPI, 2023年03月, IECG 2022, 30 - 30研究論文（国際会議プロシーディングス）
- Elsevier BV, 2023年02月, Journal of Applied Geophysics, 209, 104919 - 104919研究論文（学術雑誌）
- Elsevier BV, 2023年02月, Icarus, 391, 115367 - 115367研究論文（学術雑誌）
- Landslide dams are less frequent than other landslides, and their very existence is often very-much short-lived, because the temporary dam tends to collapse rapidly. Because of the resulting lack of evidences, there has been less research done on this topic, although the potential catastrophe they can be at the origin of needs assessment. For this purpose, the present contribution aims at differentiating landslides that trigger dams against those that do not inside a group of valleys of the Kii peninsula in Japan, where landslides occurred after the typhoon Talas in 2011. Using topographic map before the event and LiDAR data in its aftermath, the authors have calculated the factor of safety (FS) of different landslides in the same valleys, comparing the data of landslides that created dams against those that did not. The results show that landslides that triggered dams seemed to have a higher FS than those that did not. The authors suggest that it is because larger landslides are needed and thus appear more stable, but also because at the location where the slopes are stable, the riverbed can incise further instead of growing horizontally, and thus the sediments damming the channel have more chances to block it (as it is narrow) and stop the river from flowing.Universitas Muhammadiyah Surakarta, 2022年12月, Forum Geografi, 36(2) (2)研究論文（学術雑誌）
- MDPI, 2022年12月, IECG 2022, 11 - 11研究論文（国際会議プロシーディングス）
- Elsevier BV, 2022年11月, Icarus, 387, 115210 - 115210研究論文（学術雑誌）
- Springer Science and Business Media LLC, 2022年09月, Arabian Journal of Geosciences, 15(18) (18)研究論文（学術雑誌）
- MDPI AG, 2022年08月
- The timing and intensity of deformation of the Tanggula Range and Tuotuohe Basin are in debatable but strengthening the research on them is necessary for better understanding the geodynamic models of the Tibet and the tectonic-climate connections during the Cenozoic. Here we present the anisotropy of magnetic susceptibility (AMS) records from the foreland Tuotuohe Basin to understand the tectonic uplift history of the Tanggula Range for the interval of ∼37–19.7 Ma. Rock magnetic analyses indicate that the main magnetic carrier is paramagnetic and the minor is hematite. Thus, the AMS in the Tuotuohe Section (TS) can be used to track the tectonic strain related to tectonic processes. The distribution direction of the maximum principle susceptibility (Kmax) is approximately NW–SE, which intersects at about 10°with the strike of the strata and is nearly parallel to the Tanggula thrust fault system, whereas the minimum principle susceptibility (Kmin) is oriented in the NE–SW direction with a girdle distribution. This is consistent with the sedimentary fabric imprinted by the NE–SW shortening direction, representing the earliest deformation stage. AMS data in the TS can be divided into two phases at 30 Ma. From ∼37 to 30 Ma, the AMS parameters indicate an active tectonic strain and the Tanggula Range uplift induced by the India–Asia convergence, whereas between 30 and 19.7 Ma, the strain is weak compared with the earlier phase. Finally, the weak strain environment between 30 and 19.7 Ma indicated by the AMS indexes of the TS and the paleoelevation evidence from the Tuotuohe Basin all together suggest that an additional 1000–2000 m of surface uplift of the basin may have begun after 19.7 Ma.Frontiers Media SA, 2022年04月, Frontiers in Earth Science, 10研究論文（学術雑誌）
- 2022年04月, Communications Earth & Environment, 3
- 2022年01月, Palaeogeography, Palaeoclimatology, Palaeoecology, 585研究論文（学術雑誌）
- Internal temperature variations of pyroclastic flows and their deposits are arguably the most challenging data to acquire. As a preliminary study of the temperature variation inside pyroclastic flows, the remains of Onokoba Elementary School (Shimabara, Japan) were investigated. The elementary school is located in the close vicinity of Unzen volcano and was hit by one of the largest pyroclastic flows during the latest active period of the volcano on 15th of September 1991. This present preliminary study aims to determine the temperature exposure of various portion of the school building using field-forensic and urban geology. Natural hazard methods applied to the damaged materials exposed to high temperature have generated a temperature fingerprint the maximum temperature distribution. Charred wooden parts and plastic gutters installed on the schoolyard-side faced of the building turns out to be the most useful temperature indicators. The various deformation and alterations of the studied materials show significant differences in the temperature exposed to. Such differences on the second-floor section (between 75-110°C and 120-150°C) and on the first-floor section (above 435-557°C) of the building do not simply imply significant temperature heterogeneity in short distance (some ten to ≤100 m) inside the pyroclastic flow, but also points toward the possible effects of the building architecture on some key dynamic parameter of the pyroclastic flow. Such information may be important for planning future hazard mitigation actions.Universitas Muhammadiyah Surakarta, 2021年12月, Forum Geografi, 35(2) (2)研究論文（学術雑誌）
- In the aftermath of pyroclastic density current-dominated eruptions, lahars are the main geomorphic agent, but at the decadal scale, different sets of processes take place in the volcanic sediment cascade. At Unzen volcano, in the Gokurakudani gully, we investigated the geomorphologic evolution and how the topographic change and the sediment change over time is controlling this transition. For this purpose, a combination of LiDAR data, aerial photography and photogrammetry, ground penetrating radar and sediment grain size analysis was done. The results show choking zones and zones of enlargement of the gully, partly controlled by pre-eruption topography, but also by the overlapping patterns of the pyroclastic flow deposits of 1990–1995. The ground penetrating radar revealed that on top of the typical lahar structure at the bottom of the gully, side wall collapses were trapping finer sandy sediments formed in a relatively low-energy deposition environment. This shows that secondary processes are taking place in the sediment transport process, on top of lahar activity, but also that these temporary dams may be a source of sudden sediment and water release, leading to lahars. Finally, the sediments from the gully walls are being preferentially oozed out of the pyroclastic flow deposit, meaning that over longer period of time, there may be a lack of fines, increasing permeability and reducing internal pore pressure needed for lahar triggering. It also poses the important question of how much of a past event one can understand from outcrops in coarse heterometric material, as the deposit structure can remain, even after losing part of its fine material.MDPI AG, 2021年11月, Geosciences, 11(11) (11), 457 - 457研究論文（学術雑誌）
- Elsevier BV, 2021年09月, Quaternary Science Reviews, 267, 107057 - 107057, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2021年05月, Palaeogeography, Palaeoclimatology, Palaeoecology, 569, 110329 - 110329, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2021年04月, CATENA, 199, 105087 - 105087, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2021年01月, Quaternary Science Reviews, 251, 106721 - 106721, 英語[査読有り]研究論文（学術雑誌）
- Springer Science and Business Media LLC, 2020年12月, Progress in Earth and Planetary Science, 7(1) (1), 英語
Abstract Terrestrial records of the last geomagnetic reversal often have few age constraints. Chronostratigraphy using suborbital-scale paleoceanic events during marine isotope stage 19 may contribute to solving this problem. We applied the method to an 8 m long, high-resolution paleomagnetic record from a loess sequence in China and revealed millennial-to-sub-centennial scale features of the Matuyama–Brunhes (MB) transition. All samples were subjected to progressive thermal demagnetization with 14–15 steps up to 650–680 °C. As a result, 96% of the samples yielded a high-quality remanent magnetization. The MB transition terminated with a 75 cm thick zone with nine polarity flips. The polarity flip zone, dated at about 779–777 ka, began between the warm events “I” and “J” and terminated at the end of the cooling event coincident with the lowest axial-dipole strength interval. Most polarity flips occurred within 70 years. The virtual geomagnetic poles (VGPs) in the upper polarity flip zone clustered in the SW Pacific region, where the MB transitional VGPs from lavas of the Hawaiian and Canary Islands and lacustrine deposits of Java also clustered. These sites were probably dominated by dipolar fields. The absence of transitional fields across polarity flips implies a short time span for averaging fields due to a thin loess-magnetization lock-in zone. The reverse-to-normal polarity reversal dated at about 778 ka in Lingtai occurred at the end of the SW Pacific VGP zone, an important key bed for MB transition stratigraphy. The reversal is a good candidate for the main MB boundary. We found an excursion at about 766 ka spanning about 1 ka.[査読有り]研究論文（学術雑誌） - Elsevier BV, 2020年12月, Quaternary Science Reviews, 250, 106641 - 106641, 英語[査読有り]研究論文（学術雑誌）
- Oxford University Press (OUP), 2020年11月, Geophysical Journal International, 224(2) (2), 795 - 812, 英語
SUMMARY An archaeomagnetic, rock magnetic and magnetic fabric study has been carried out on seven anthropogenic ash horizons in the Middle Palaeolithic sedimentary level XXIV at the rock shelter of Crvena Stijena (‘Red Rock’), Montenegro. The study has multiple goals, including the identification of iron bearing minerals formed during combustion, assessment of the suitability of these combustion features for recording the Earth´s magnetic field direction, revelation of the magnetic fabric and its significance in the characterization of cave (rock shelter) burnt facies, and identification of post-burning alteration processes. Magnetite has been identified as the main ferromagnetic component of the ash. The ash layers exhibit a high thermomagnetic reversibility in contrast to the irreversible behaviour of their subjacent burnt black layers which is related to the different temperatures attained. Seven mean archaeomagnetic directions were obtained with acceptable statistical values indicating that these features recorded the field direction at the time of burning. However, some of them are out of the expected range of secular variation for mid-latitude regions suggesting post-burning alterations. The magnetic fabric of the ash was characterized by anisotropy of low field magnetic susceptibility measurements. Statistical analysis (box and whisker plot) of the basic anisotropy parameters, such as foliation, lineation, degree of anisotropy and the shape parameter, along with the alignment of the principal susceptibilities on stereoplots, revealed variation among the ash units. The diverse, oblate to prolate, lineated or strongly foliated, quasi-horizontally and vertically oriented fabrics of the units may indicate different slope processes, such as orientation by gravity, solifluction, run-off water, quasi-vertical migration of groundwater and post-burning/post-depositional alteration of the fabric by rockfall impact. In sum, the magnetic characterization of the ash layers has shown the occurrence of different post-burning alteration processes previously not identified at the site. Alteration processes in prehistoric combustion features are often identified from macroscopic observations but our study demonstrates that multiple processes can affect them and are usually unnoted because they take place on a microscopic scale. Their identification is critical for a correct chronological and cultural interpretation of a site (e.g. collection of samples for dating, stratigraphic displacement of remains), especially if significant alterations are involved. Magnetic methods are therefore a powerful but underutilized tool in palaeolithic research for the identification and evaluation of taphonomic processes affecting prehistoric fires.[査読有り]研究論文（学術雑誌） - Elsevier BV, 2020年11月, Earth-Science Reviews, 210, 103385 - 103385, 英語[査読有り]研究論文（学術雑誌）
- Cambridge University Press (CUP), 2020年10月, Quaternary Research, 1 - 25, 英語
Abstract The late Quaternary development of the Lower Volga region of Russia is characterized by an alternating influence of marine and continental environments resulting from fluctuations in Caspian Sea level during the last glaciation. However, sediments deposited under continental conditions have received very little research attention compared to the under- and overlying marine deposits, such that even their origin is still in debate. Detailed magnetic mineralogical analyses presented here show clear similarities to loess. The results suggest that climate during the time of loess deposition, the Atelian regression (27–80 ka, MIS 4–3), was dry and cool, similar to the modern-day Northern Caspian lowland. The magnetic properties recorded in the loess-paleosol sequences of the Lower Volga also point to short episodes of potentially more humid and warmer climate during the late Atelian. The new findings in regard to the local Caspian climate and environmental evolution support decreased river discharge from the Russian Plain and Siberian Plain as the dominant factor causing the low Caspian sea level stand during the Atelian, although local-regional climate changes might have had an additional influence.[査読有り]研究論文（学術雑誌） - Elsevier BV, 2020年09月, Journal of Volcanology and Geothermal Research, 401, 106973 - 106973, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2020年06月, Quaternary International, 552, 122 - 134, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2020年06月, Quaternary International, 552, 25 - 35, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2020年06月, Quaternary International, 552, 36 - 49, 英語[査読有り]研究論文（学術雑誌）
- American Geophysical Union (AGU), 2020年03月, Journal of Geophysical Research: Solid Earth, 125(3) (3), 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2019年11月, Palaeogeography, Palaeoclimatology, Palaeoecology, 534, 109335 - 109335, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2019年09月, Quaternary International, 552, 50 - 61, 英語[査読有り]研究論文（学術雑誌）
- Wiley, 2019年05月, Journal of Quaternary Science, 34(4-5) (4-5), 299 - 308[査読有り]研究論文（学術雑誌）
- Oxford University Press (OUP), 2019年03月, Geophysical Journal International, 217(3) (3), 1742 - 1754, 英語[査読有り]研究論文（学術雑誌）
- Elsevier BV, 2019年03月, Palaeogeography, Palaeoclimatology, Palaeoecology, 518, 72 - 81, 英語[査読有り]研究論文（学術雑誌）
- Elsevier, 2018年11月, Geoderma, 330, 221 - 231, 英語[査読有り]研究論文（学術雑誌）
- Elsevier, 2018年11月, Geoderma, 330, 125 - 135, 英語[査読有り]研究論文（学術雑誌）
- Elsevier, 2018年02月, Aeolian Research, 30, 20 - 31, 英語[査読有り]研究論文（学術雑誌）
- Springer Science and Business Media LLC, 2017年12月, Scientific Reports, 7(1) (1), 英語[査読有り]研究論文（学術雑誌）
- Elsevier {BV}, 2017年05月, Marine Geology, 387, 85 - 96, 英語[査読有り]研究論文（学術雑誌）
- Cambridge University Press ({CUP}), 2016年09月, Quaternary Research, 86(03) (03), 348 - 358, 英語
Abstract Anisotropy of magnetic susceptibility (AMS) is a frequently applied method in sedimentology, especially in the determination of the orientation of transport processes. We present an analysis of magnetic fabric (MF) studies on loess. New aspects of fabric development reveal: i) The deposition of the aeolian sediments was controlled by gravity, low-energy transport and local geomorphology, hence no clarified wind direction can be defined. ii) The influence of phyllosilicates is also significant among the magnetic components. iii) While the primary MF is relatively well-defined, the secondary MF is influenced by several processes. The analysis of stereoplots combined with the q—β diagram and photostatistics showed encouraging results during the characterization of various secondary MF such as redeposited MF and pedogenic fabric. iv) Changes in processes from aeolian to water-lain deposition and the increasing transportation energy were reflected by the connection between AMS and observed micro-scale sedimentary features. v) A relationship was obvious between the degree of pedogenesis and the transformation of sedimentary MF into a vertical MF typical for paleosols. vi) The significant role of very fine grained magnetite on the formation of inverse MF could not be excluded.[査読有り]研究論文（学術雑誌） - Springer Netherlands, 2016年03月, Origins of Life and Evolution of Biospheres, 46(4) (4), 435 - 454, 英語[査読有り]研究論文（学術雑誌）
- Elsevier, 2015年09月, Journal of Volcanology and Geothermal Research, 302, 141 - 149, 英語[査読有り]研究論文（学術雑誌）
- 2015年, Földtani Közlöny, 145(4) (4), 367 - 384A Visegrádi-szoros kiemelt helyzetű kavicsos üledékeinek vizsgálata Zebegény térségében, és jelentősége a magas dunai teraszok morfosztratigráfiai besorolásakor研究論文（学術雑誌）
- John Wiley \& Sons, Ltd Chichester, UK, 2014年10月, Weather, 69(11) (11), 309 - 313, 英語[査読有り]研究論文（学術雑誌）
- Miskolci Egyetem F{\"o}ldrajz Int{\'e}zete, 2014年Szaharai por a Kárpát-medencében研究論文（学術雑誌）
- Miskolci Egyetem F{\"o}ldrajz Int{\'e}zete, 2014年Porviharok forrásterületeinek térbeli eloszlása, szezonális jellemzői és geomorfológiai viszonyai研究論文（学術雑誌）
- 2014年A Mende Felső paleotalaj komplexum összehasonĺıtó jellemzése a verőcei lösz-paleotalaj rétegsorokban研究論文（学術雑誌）
- Elsevier {BV}, 2014年01月, Quaternary International, 319, 1 - 10, 英語[査読有り]研究論文（学術雑誌）
- Elsevier {BV}, 2014年01月, Quaternary International, 319, 76 - 87, 英語[査読有り]研究論文（学術雑誌）
- Pergamon, 2014年01月, Quaternary International, 319, 119 - 136, 英語[査読有り]研究論文（学術雑誌）
- Pergamon, 2011年04月, Quaternary International, 234(1-2) (1-2), 86 - 97, 英語[査読有り]研究論文（学術雑誌）
- Springer Nature, 2010年01月, Studia Geophysica et Geodaetica, 54(1) (1), 121 - 134, 英語[査読有り]研究論文（学術雑誌）
- Academic Press, 2009年10月, Journal of Archaeological Science, 36(10) (10), 2437 - 2444, 英語[査読有り]研究論文（学術雑誌）
- Elsevier {BV}, 2009年04月, Quaternary International, 198(1-2) (1-2), 62 - 76, 英語[査読有り]研究論文（学術雑誌）
- Pergamon, 2009年04月, Quaternary International, 198(1-2) (1-2), 77 - 84, 英語[査読有り]研究論文（学術雑誌）
- Akad{\'e}miai Kiad{\'o}, co-published with Springer Science+ Business Media BV, Formerly Kluwer Academic Publishers BV, 2009年03月, Central European Geology, 52(1) (1), 31 - 42研究論文（学術雑誌）
- 2008年, Földtani Közlöny, 138, 297 - 310Középső-pleisztocén löszben előforduló vulkáni képződmények Magyarországon: terepi és petrográfiai jellemzők研究論文（学術雑誌）
- 2008年, Archeometriai Műhely, 3, 13 - 25Gorzsa Késő neolit tell településről előkerült kőeszközök archeometriai vizsgálatának előzetes eredményei (Tisza kultúra, DK Magyarország)研究論文（学術雑誌）
- 2008年Environmental and geoarchaeological studies at Vörs-Máriaasszony sziget site, SW Hungary研究論文（学術雑誌）
- 2005年, Archeometriai Műhely, 1, 13 - 22Mágneses szuszceptibilitás mérések, új módszer alkalmazása csiszolt kőeszközök vizsgálatában (Magnetic susceptibility measurements of polished stone tools--application of new method in archeometry)研究論文（学術雑誌）
- Soil Science Society of America (SSSA)2020年 - 2021年
- Hungarian National Committee of INQUA, International Union for Quaternary Research2015年 - 2021年
- INQUA Commission on Stratigraphy and Chronology - ECR (Early Carrier Researcher) representative2015年 - 2019年
- Japan Geoscience Union (JpGU)2016年
- INQUA Commission on Stratigraphy and Chronology2015年
- Hungarian Commission on Stratigraphy - Secretary of the Quaternary Working Group2008年 - 2010年
- Hungarian Geological Society2001年
■ メディア報道