Research activity information

• Magmatic system of the Kikai submarine caldera, SW Japan, imaged by passive seismic tomography

  Yojiro Yamamoto, Aki Ito, Yasushi Ishihara, Masayuki Obayashi, Satoru Tanaka, Haruhisa Nakamichi, Hiroshi Yakiwara, Yukihiro Nakatani, Hiroko Sugioka, Hironori Otsuka, Tetsuo Matsuno

  Elsevier BV, Sep. 2025, Journal of Volcanology and Geothermal Research, 465, 108369 - 108369

  [Refereed]

  Scientific journal


• Geoelectrical evidence of fluid controlling slow and regular earthquakes along a plate interface.

  Hayato Nakamura, Hiroshi Ichihara, Tada-Nori Goto, Tetsuo Matsuno, Noriko Tada, Manaka Kuroda, Shinya Sato

  Understanding the distribution of physical properties around shallow subducting plate interfaces, where both destructive and "slow" earthquakes occur due to rapid and slower fault slips, respectively, presents a major scientific and disaster mitigation challenge. Pore water is a key factor in understanding the different slip mechanisms and their spatial relationships; however, its distribution remains understudied. In this study, based on marine magnetotelluric survey in Hyuga-nada, southwestern Japan, we identified distinct resistive and conductive anomalies along the plate interface. These anomalies correspond to areas of scarce pore fluid and high concentration area of pore fluids sourced from subducting seamounts (Kyushu-Palau Ridge), respectively. The wet area corresponds to the slow slip area, whereas the dry and transition areas correspond to areas of fast fault slip. These findings provide clear observational evidence that pore fluid distribution correlates with fault rupture behavior.

  May 2025, Scientific reports, 15(1) (1), 17077 - 17077, English, International magazine

  [Refereed]

  Scientific journal


• Report on the International Symposium “Submarine Caldera Volcanoes ─ The Cutting Edge of Our Understanding Achieved by Various Approaches ─” at Kobe and Post-conference Field Trip at Kagoshima in March 2024

  Matsuno Tetsuo, Kiyosugi Koji, Nakaoka Reina, Yamamoto Yuzuru, Kaneko Katsuya, Ueki Kenta, Yamamoto Yojiro, Ito Aki, Suzuki-Kamata Keiko

  The Volcanological Society of Japan, Dec. 2024, BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN, 69(4) (4), 223 - 228, Japanese

  [Refereed]


• Submarine cores record magma evolution toward a catastrophic eruption at Kikai Caldera

  Takeshi Hanyu, Nobukazu Seama, Katsuya Kaneko, Qing Chang, Reina Nakaoka, Koji Kiyosugi, Yuzuru Yamamoto, Tetsuo Matsuno, Keiko Suzuki-Kamata, Yoshiyuki Tatsumi

  Aug. 2024, Communications Earth & Environment, 5, 428

  [Refereed]

  Scientific journal


• Submarine pyroclastic deposits from 7.3 ka caldera-forming Kikai-Akahoya eruption

  Satoshi Shimizu, Reina Nakaoka, Nobukazu Seama, Keiko Suzuki-Kamata, Katsuya Kaneko, Koji Kiyosugi, Hikaru Iwamaru, Mamoru Sano, Tetsuo Matsuno, Hiroko Sugioka, Yoshiyuki Tatsumi

  Elsevier BV, Apr. 2024, Journal of Volcanology and Geothermal Research, 448, 108017 - 108017

  [Refereed]

  Scientific journal


• Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan

  Mari Hamahashi, Hironori Otsuka, Yoshiaki Suzuki, Jun Arimoto, Tetsuo Matsuno, Nobukazu Seama, Yuzuru Yamamoto, Hiroko Sugioka, Stephen A. Bowden, Satoshi Shimizu, Hikaru Iwamaru, Mamoru Sano, Keita Suzuki, Katsuya Kaneko, Kazuo Nakahigashi, Yoshiyuki Tatsumi

  Abstract The Osaka Bay is situated at a seismically active region north of the Median Tectonic Line and east of Awaji Island in western Japan, known as part of the Kinki Triangle and the Niigata–Kobe Tectonic Zone. Dense distribution of active faults and high geodetic strain rates characterize the region, posing a major seismic hazard potential to the coastal and metropolitan areas of the Kansai region. To investigate the shallow structure and recent deformation history of active faults in the Osaka Bay, we acquired 15 high-resolution seismic profiles using a Mini-GI airgun and a Boomer as active sources, together with multi-beam bathymetry data across the Osaka Bay Fault. Our seismic sections image a ~ 0.1 to 3.7 km-wide asymmetric anticline forelimb above the Osaka Bay Fault at shallow depths, coupled with a ~ 2.6 km-wide syncline to the west, and a broad, ~ 11 km-wide syncline in the footwall to the east. The synclinal axial surface at shallow depths measured in this study ranges 75°–89°. We observe the vertical displacement of the Osaka Bay Fault increasing northwards along strike. The sediment thickness on the hanging wall, however, is variable, modified by non-tectonic processes such as by tidal currents, affecting the geometry of growth strata. The most recent deformation by the Osaka Bay Fault reaches to near the seafloor by active folding, with large vertical offsets of 8–14 m over the last ~ 11 ka, and 5–11 m over the last ~ 5 ka. By combining with previously reported borehole age data, the average uplift rate on the Osaka Bay Fault is estimated to be ~ 1.0 to 1.7 m/ka during the Latest Pleistocene to Holocene. The inferred slip of the Osaka Bay Fault during the Holocene is likely to account for > 5% of the regional geodetic strain accumulation within the Kinki Triangle. Further studies to evaluate the Holocene slip rates of regional faults are necessary to assess the seismic hazards and the internal strain budgets within the Kinki Triangle and the Niigata–Kobe Tectonic Zone. Graphical abstract

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

  [Refereed]

  Scientific journal


• Characteristics of the Kikai-Akahoya and Kikai-Tozurahara eruption deposits from submarine cores

  Nakaoka R., Suzuki K., Kaneko K., Seama N., Kiyosugi K., Yamamoto Y., Matsuno T., Hanyu T., Shimizu S., Tatsumi Y.

  The Volcanological Society of Japan, 2024, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2024, 217 - 217, Japanese


• Enhanced and Asymmetric Melting Beneath the Southern Mariana Back-Arc Spreading Center Under the Influence of Pacific Plate Subduction

  Tetsuo Matsuno, Nobukazu Seama, Haruka P. Shindo, Yoshifumi Nogi, Kyoko Okino

  Mar. 2022, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 127(3) (3), e2021JB022374, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Characteristics of Kikai caldera volcanic product revealed by seafloor drilling samples

  Nakaoka Reina, Kaneko Katsuya, Seama Nobukazu, Suzuki Keiko, Kiyosugi Koji, Hanyu Takeshi, Yamamoto Yuzuru, Matsuno Tetsuo, Satoshi Shimizu, Sugioka Hiroko, Yoshiyuki Tatsumi

  Kikai Caldera volcano has repeatedly erupted in large scale eruptions such as the Kikai Akahoya eruption 7,300 years ago and the Kikai Tozurahara eruption 95,000 years ago, and detailed eruption history can be studied by combining seafloor and on-land surveys.In this study, core samples were collected by the SCORE program of CHIKYU based on the subsurface structure revealed by seismic reflection surveys of large eruptive ejecta on the seafloor, which are still largely unknown.The chemical composition of the volcanic glass was analyzed and compared with subaerial deposits, and it was found that the two large-scale eruptive ejecta are thickly deposited on the seafloor as well, and that the Kikai Akahoya product is divided into two units on the seafloor as well.In addition, the chemical compositional characteristics of volcanic glass in piston core samples from a wide area around the Kikai caldera suggest that the Kikai Akahoya product may have become less accessible to distant sites as the eruption progressed.

  GEOCHEMICAL SOCIETY OF JAPAN, 2022, Abstracts of Annual Meeting of the Geochemical Society of Japan, 69, 95, Japanese


• Probing 1-D electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data

  Tetsuo Matsuno, Kiyoshi Baba, Hisashi Utada

  Sep. 2020, Geophysical Journal International, 222(3) (3), 1502 - 1525, English

  [Refereed]

  Scientific journal


• Modeling of a dispersive tsunami caused by a submarine landslide based on detailed bathymetry of the continental slope in the Nankai trough, southwest Japan

  Baba, T., Y. Gon, K. Imai, K. Yamashita, T. Matsuno, M. Hayashi, H. Ichihara

  Aug. 2019, Tectonophysics, 768, 228182, English

  [Refereed]

  Scientific journal


• A new miniaturized magnetometer system for long-term distributed observation on the seafloor

  K. Ogawa, T. Matsuno, H. Ichihara, K. Nakahigashi, N. Seama

  Jul. 2018, Earth, Planets and Space, 70(1) (1), 111 - 111, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Giant rhyolite lava dome formation after 7.3 ka supereruption at Kikai caldera, SW Japan

  TATSUMI YOSHIYUKI, SUZUKI KEIKO, MATSUNO TETSUO, HIROSHI ICHIHARA, SEAMA NOBUKAZU, KIYOSUGI KOJI, NAKAOKA REINA, NAKAHIGASHI KAZUO, H. Takizawa, KAZUKI HAYASHI, TATSURO CHIBA, SHIMIZU SATOSHI, SANO MAMORU, IWAMARU HIKARU, MOROZUMI HARUHISA, SUGIOKA HIROKO, Y. Yamamoto

  Feb. 2018, Scientific Reports (Nature Publishing Group), 8(1) (1), 2753 - 2753, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Constraints on lithospheric mantle and crustal anisotropy in the NoMelt area from an analysis of long-period seafloor magnetotelluric data

  Tetsuo Matsuno, Rob. L. Evans

  Oct. 2017, EARTH PLANETS AND SPACE, 69(1) (1), 138 - 138, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Electrical conductivity of old oceanic mantle in the northwestern Pacific I: 1-D profiles suggesting differences in thermal structure not predictable from a plate cooling model

  Kiyoshi Baba, Noriko Tada, Tetsuo Matsuno, Pengfei Liang, Ruibai Li, Luolei Zhang, Hisayoshi Shimizu, Natsue Abe, Naoto Hirano, Masahiro Ichiki, Hisashi Utada

  Aug. 2017, EARTH PLANETS AND SPACE, 69(1) (1), 111 - 111, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic thickness, and water content

  Tetsuo Matsuno, Daisuke Suetsugu, Kiyoshi Baba, Noriko Tada, Hisayoshi Shimizu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aid Ito, Masayuki Obayashi, Hisashi Utada

  Lead, Mar. 2017, EARTH AND PLANETARY SCIENCE LETTERS, 462, 189 - 198, English

  [Refereed]

  Scientific journal


• Electrical resistivity structure under the western Cosmonauts Sea at the continental margin of East Antarctica inferred via a marine magnetotelluric experiment

  Tetsuo Matsuno, Yoshifumi Nogi, Nobukazu Seama

  Lead, Jun. 2015, POLAR SCIENCE, 9(2) (2), 221 - 234, English

  [Refereed]

  Scientific journal


• Electrical resistivity structure of the snail site at the Southern Mariana trough spreading center

  Tetsuo Matsuno, Maho Kimura, Nobukazu Seama

  Lead, Springer Japan, Jan. 2015, Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept, 241 - 251, English

  [Refereed]

  In book


• Robust magnetotelluric inversion

  Tetsuo Matsuno, Alan D. Chave, Alan G. Jones, Mark R. Muller, Rob L. Evans

  Mar. 2014, GEOPHYSICAL JOURNAL INTERNATIONAL, 196(3) (3), 1365 - 1374, English

  [Refereed]

  Scientific journal


• Electromagnetic detection of plate hydration due to bending faults at the Middle America Trench

  Kerry Key, Steven Constable, Tetsuo Matsuno, Rob L. Evans, David Myer

  Oct. 2012, EARTH AND PLANETARY SCIENCE LETTERS, 351, 45 - 53, English

  [Refereed]

  Scientific journal


• Electromagnetic constraints on a melt region beneath the central Mariana back-arc spreading ridge

  Tetsuo Matsuno, Rob L. Evans, Nobukazu Seama, Alan D. Chave

  Oct. 2012, GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 13(10) (10), Q10017, English

  [Refereed]

  Scientific journal


• Upper mantle electrical resistivity structure beneath the central Mariana subduction system

  Tetsuo Matsuno, Nobukazu Seama, Rob L. Evans, Alan D. Chave, Kiyoshi Baba, Antony White, Tada-nori Goto, Graham Heinson, Goran Boren, Asami Yoneda, Hisashi Utada

  Lead, Sep. 2010, GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 11(9) (9), Q09003, English

  [Refereed]

  Scientific journal


• 1-D electrical conductivity structure beneath the Philippine Sea: Results from an ocean bottom magnetotelluric survey

  Nobukazu Seama, Kiyoshi Baba, Hisashi Utada, Hiroaki Toh, Noriko Tada, Masahiro Ichiki, Tetsuo Matsuno

  Jun. 2007, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 162(1-2) (1-2), 2 - 12, English

  [Refereed]

  Scientific journal


• A study on correction equations for the effect of seafloor topography on ocean bottom magnetotelluric data

  Tetsuo Matsuno, Nobukazu Seama, Kiyoshi Baba

  Lead, 2007, EARTH PLANETS AND SPACE, 59(8) (8), 981 - 986, English

  [Refereed]

  Scientific journal


• On Board Cruise Report of KR06-12 Kairei Cruise

  Seama Nobukazu, T. Goto, K. Baba, R.L. Evans, A. White, T. Matsuno, R. Tsujino, A. Yoneda, G.Boren, J. Bailey, H. Moeller, A. Gardner, M. Aoki, M. Ido

  2006, 不明, 38741, English

  Scientific journal


• Preliminary report of KR02-14 Kairei cruise

  Seama, N, Goto, K, Nogi, Y, Ichiki, M, Kasaya, T, Tada, N, Iwamoto, H, Kitada, K, Matsuno, T, Yoshida, S, Kawada, Y, Ito, M, Ishii, R, Takizawa, K, Suyehiro, K, Utada, H, Shimoizumi, M

  2003, JAMSTEC Journal of Deep Sea Research, 22, 22, 89-106 - 106

• Study of Tide-Induced Electromagnetic Field Response in the Kikai Caldera Sea Area

  柴田悠, 野々山達也, 島伸和, 島伸和, 南拓人, 小畑拓実, 松野哲男, 杉岡裕子, 杉岡裕子, 大塚宏徳, 羽入朋子, 山本揚二朗, 中道治久

  Nov. 2024, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 156th


• 3-D resistivity modeling based on marine magnetotelluric data in the Kumano-nada, southwestern Japan arc

  Kuroda, M., Ichihara, H., Goto, T., Matsuno, T., Tadokoro, K., Kasaya, T.

  Sep. 2024, The 26th Electromagnetic Induction Workshop (EMIW2024)


• Electrical resistivity modeling in megathrust earthquake regions of hot and cold subduction margins along Japan Island Arc

  Ichihara, H., Nakamura, T., Goto, T., Kuroda, M., T. Kasaya, M., Matsuno, T., Tada, N., Baba, K.

  Sep. 2024, The 26th Electromagnetic Induction Workshop (EMIW2024)


• Estimation of 3-D resistivity structure under the Kikai submarine caldera volcano

  Obata, T., Araki, M., Hirose, T., Matsuno, T., Minami, T., Usui, Y., Otsuka, H., Ichihara, H., Tatsumi, Y., Sugioka, H., Seama, N.

  Sep. 2024, The 26th Electromagnetic Induction Workshop (EMIW2024)


• Imaging magma supply system of Kikai caldera by seismic tomography

  山本揚二朗, 伊藤亜妃, 石原靖, 大林政行, 田中聡, 中道治久, 八木原寛, 仲谷幸浩, 杉岡裕子, 大塚宏徳, 松野哲男, 島伸和

  The Volcanological Society of Japan, Sep. 2024, 日本火山学会講演予稿集, 2024, 49 - 49, Japanese


• P-wave velocity structure around Kikai Caldera obtained by a global tomography

  大林政行, 吉光淳子, 山本揚二朗, 伊藤亜妃, 石原靖, 田中聡, 中道治久, 八木原寛, 仲谷幸浩, 杉岡裕子, 大塚宏徳, 松野哲男, 島伸和

  The Volcanological Society of Japan, Sep. 2024, 日本火山学会講演予稿集, 2024, 218 - 218, Japanese


• Observation of electromagnetic fields and calculation of MT responses in Kumano-nada

  Kuroda Manaka, Goto Tadanori, Ichihara Hiroshi, Matsuno Tetsuo, Tadokoro Keiichi, Kasaya Takafumi

  Conductivity Anomaly Research Group, Jul. 2024, Proceedings of the Conductivity Anomaly Workshop, 2024, 18 - 20, Japanese


• 熊野灘における海底電磁場観測と海底地形を考慮した三次元比抵抗モデリング

  黒田 真奈加, 後藤 忠徳, 市原 寛, 松野 哲男, 田所 敬一, 笠谷 貴史

  May 2024, 日本地球惑星科学連合大会予稿集(Web) 2024 2024年 2024年5月


• 3-D resistivity structure under the Kikai submarine caldera volcano

  小畑 拓実, 荒木 将允, 廣瀬 時, 松野 哲男, 南 拓人, 臼井 嘉哉, 大塚 宏徳, 市原 寛, 巽 好幸, 杉岡 裕子, 島 伸和

  May 2024, 日本地球惑星科学連合大会予稿集(Web) 2024 2024年 2024年5月


• 最終氷期以降における大阪湾の音響層序と地殻変動

  岩波 知宏、大塚 宏徳、松野 哲男、島 伸和、浜橋 真理、佐野 守、井和丸 光、鈴木 啓太、杉岡 裕子

  May 2024, 日本地球惑星科学連合大会予稿集(Web) 2024 2024年 2024年5月


• 海陸自然地震観測による鬼界カルデラの地震波速度構造

  山本 揚二朗, 伊藤 亜妃, 石原 靖, 大林 政行, 田中 聡, 中道 治久, 八木原 寛, 仲谷 幸浩, 杉岡 裕子, 大塚 宏徳, 松野 哲男, 島 伸和

  May 2024, 日本地球惑星科学連合大会予稿集(Web) 2024 2024年


• 鬼界カルデラ火山海域での地下比抵抗構造

  小畑拓実, 荒木将允, 廣瀬時, 松野哲男, 南拓人, 臼井嘉哉, 大塚宏徳, 巽好幸, 杉岡裕子, 市原寛, 島伸和

  Mar. 2024, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2023


• (entry) The distribution of small faults and acoustic stratigraphy of the alluvium in the Osaka Bay, Japan, revealed by sub-bottom profiler data

  IWANAMI Tomohiro, OTSUKA Hironori, MATSUNO Tetsuo, SEAMA Nobukazu, HAMAHASHI Mari, SANO Mamoru, IWAMARU Hikaru, SUZUKI Keita, SUGIOKA Hiroko

  大阪湾は、上町断層帯や六甲・淡路島断層帯、中央構造線断層帯など、いくつかの主要活断層帯によって囲まれた閉鎖性海域である。六甲・淡路島断層帯においては1995年に兵庫県南部地震(気象庁マグニチュード7.3)が発生しており、2013年にも気象庁マグニチュード6.3の地震が淡路島で発生している。また、大阪府北部においては、2018年に気象庁マグニチュード5.5の地震が発生している。これまでの反射法地震探査の結果から、大阪湾断層帯と呼ばれる北東-南西走向で約39 km延びている北西側隆起の逆断層帯が大阪湾西部で確認されており、このような大規模な断層だけでなく、他にも数多くの活断層が発達している（岩淵ほか, 1995）。大阪湾内全域の断層分布や活動履歴を把握することは、大阪湾にかかる応力とそれによるテクトニックな変遷を理解するために重要である。また、海底下に存在する断層は津波を引き起こす可能性もあるため（たとえば河田ほか, 2005）、大阪湾付近にある大都市の災害のリスク評価にも役立てることができる。 本研究では、大阪湾において、最終氷期以降（約18,000年前以降）の断層活動の影響を受けていると考えられる沖積層の層厚分布を面的に作成すること、および、小断層を見つけ、その分布や活動履歴を把握することを目的とした。解析に用いたデータは、2022年8月、10月、および2023年3月に神戸大学の練習船「海神丸」に搭載されたKongsberg社のサブボトムプロファイラーTOPAS PS18によって大阪湾中・南部を対象として1~3 km間隔の格子状に広範囲に取得した。一般的な反射法地震探査で用いる音源は100 Hz程度の低周波であるのに対して、サブボトムプロファイラーは1-10 kHz程度の高周波であるため、反射法地震探査と比べて、高分解能のデータを得ることができる。本調査では、帯域幅2~6 kHz、信号長1 msのチャープ波を主に使用した。調査の結果、底下30 m程度の沖積層や洪積層上部に関して数十cm程度の細かい層を認定できるような高分解能のデータが得られた。 データ解析では、まず音響基盤となる洪積層より上位の沖積層を地震学的に3~5の堆積ユニットに区分した。OpendTectやPetrelを用いて海底面や各堆積ユニットの境界面をピックし、QGISを用いて、境界面の深度の差を取ることから各堆積ユニットの層厚分布を面的に得ることができ、各堆積ユニットの深度変化をマッピングすることができた。区分した堆積ユニットの年代の制約には過去に行われたボーリング調査の結果（たとえば七山ほか, 2000）を用いた。断面上で断層を確認した位置もマッピングを行った。大阪湾断層帯以外の顕著な変形構造として、岩淵ほか(2000)で津名沖断層として記載されている活断層の近傍に撓曲構造を確認した。この撓曲構造は表層付近まで変位が確認できることから、最近まで活動していたことが考えられ、今後活動履歴を詳細に考察する必要がある。本発表では、これらの堆積ユニットの層厚分布を面的に示して、大阪湾における過去の海底面や堆積環境の復元や断層活動との関連を議論する予定である。引用文献：岩淵ほか（1995）大阪湾西部の活断層, 海洋調査技術, 7, 11-19岩淵ほか（2000）反射法音波探査に基づく大阪湾の基盤と活構造, 水路部研究報告, 36, 1-23河田ほか（2005）大阪湾臨海都市域の津波脆弱性と防災対策効果の評価, 海岸工学論文集, 52, 1276-1280七山ほか（2000）大阪湾断層及び和田岬断層の完新世活動性調査, 平成11年度活断層・古地震研究調査概要報告書, 179-193

  The Geological Society of Japan, 2023, Annual Meeting of the Geological Society of Japan, 2023, 226, Japanese


• 鬼界カルデラ破局噴火のマグマ準備過程

  羽生毅, 常青, 中岡礼奈, 清杉孝司, 金子克哉, 鈴木桂子, 山本由弦, 松野哲男, 島伸和, 巽好幸

  2023, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2022


• 鬼界海底カルデラの総合調査

  田中聡, 羽生毅, 藤江剛, 山本揚二朗, 小平秀一, 宮崎隆, 臼井洋一, 上木賢太, TEJADA Maria Luisa G., 宮町宏樹, 西来邦章, 佐藤勇輝, 島伸和, 鈴木桂子, 金子克哉, 松野哲男, 清杉孝司, 中岡礼奈, 大塚宏徳, 清水賢, 荒木将允, 長屋暁大, 小畑拓実

  2023, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2022


• 鬼界カルデラ火山海底下の三次元比抵抗構造解析

  小畑拓実, 荒木将允, 廣瀬時, 沖園雄希, 松野哲男, 南拓人, 大塚宏徳, 巽好幸, 杉岡裕子, 島伸和, 羽生毅, 田中聡, 市原寛

  2023, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2022


• 屈折法地震波構造探査によって明らかになった鬼界カルデラ火山直下の低速度領域

  長屋暁大, 長屋暁大, 藤江剛, 小平秀一, 田中聡, 山本揚二朗, 杉岡裕子, 杉岡裕子, 宮町宏樹, 松野哲男, 大塚宏徳, 鈴木啓太, 鈴木啓太, 島伸和, 島伸和

  2023, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2022


• Low-velocity anomaly beneath Kikai-caldera submarine volcano, Japan, revealed by seismic refraction survey

  長屋暁大, 藤江剛, 小平秀一, 田中聡, 山本揚二朗, 杉岡裕子, 杉岡裕子, 宮町宏樹, 松野哲男, 大塚宏徳, 鈴木啓太, 島伸和, 島伸和

  2023, 日本地球惑星科学連合大会予稿集(Web), 2023


• Investigation of extraction method of high-quality electromagnetic data for marine MT survey

  黒田真奈加, 後藤忠徳, 市原寛, 松野哲男, 笠谷貴史

  2023, 日本地球惑星科学連合大会予稿集(Web), 2023


• Seismic velocity structure of Kikai caldera based on amphibious passive seismic observations

  山本揚二朗, 伊藤亜妃, 石原靖, 大林政行, 田中聡, 中道治久, 八木原寛, 仲谷幸浩, 杉岡裕子, 大塚宏徳, 松野哲男, 島伸和

  The Volcanological Society of Japan, 2023, 日本火山学会講演予稿集, 2023 (Web), 147 - 147, Japanese


• Imaging a 3-D resistivity structure under the Kikai submarine caldera volcano.

  小畑拓実, 荒木将允, 廣瀬時, 松野哲男, 南拓人, 大塚宏徳, 巽好幸, 杉岡裕子, 杉岡裕子, 市原寛, 島伸和, 島伸和

  2023, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 154th


• The distribution of small faults and acoustic stratigraphy of the alluvium in the Osaka Bay, Japan, revealed by sub-bottom profiler data

  岩波知宏, 大塚宏徳, 松野哲男, 島伸和, 島伸和, 浜橋真理, 佐野守, 佐野守, 井和丸光, 井和丸光, 鈴木啓太, 鈴木啓太, 杉岡裕子, 杉岡裕子

  2023, 日本地質学会学術大会(Web), 130th


• OBEMおよびNetwork-MTデータの統合解析による日向灘周辺の3次元比抵抗構造の推定—Three-dimensional resistivity modeling around the Hyuga-nada area based on OBEM and Network-MT data

  中村 捷人, 市原 寛, 畑 真紀, 多田 訓子, 後藤 忠徳, 松野 哲男, 上嶋 誠

  [東京] : CA研究グループ, 2022, Conductivity anomaly研究会論文集, 47 - 51, Japanese


• Development of 3D resistivity structure analysis method considering the effects of seafloor topography.

  小畑拓実, 荒木将允, 松野哲男, 南拓人, 島伸和, 島伸和

  2022, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 152nd


• Late Pleistocene to Holocene dynamic basin environment at the Osaka Bay: Stratigraphic expressions of tectonic deformation, sea level fluctuation, and tidal waves

  HAMAHASHI Mari, OTSUKA Hironori, SUZUKI Yoshiaki, ARIMOTO Jun, YAMAMOTO Yuzuru, YAMAMOTO Yuzuru, SEAMA Nobukazu, SEAMA Nobukazu, BOWDEN Stephen, BOWDEN Stephen, MATSUNO Tetsuo, SUGIOKA Hiroko, SUGIOKA Hiroko, SHIMIZU Satoshi, SHIMIZU Satoshi, IWAMARU Hikaru, IWAMARU Hikaru, SANO Mamoru, SANO Mamoru, SUZUKI Keita, SUZUKI Keita, KANEKO Katsuya, KANEKO Katsuya, NAKAHIGASHI Kazuo, TATSUMI Yoshiyuki

  2022, 日本地球惑星科学連合大会予稿集(Web), 2022


• Amphibious passive seismic observation at Kikai submarine caldera

  YAMAMOTO Yojiro, ITO Aki, ISHIHARA Yasushi, OBAYASHI Masayuki, TANAKA Satoru, NAKAMICHI Haruhisa, YAKIWARA Hiroshi, NAKATANI Yukihiro, SUGIOKA Hiroko, SUGIOKA Hiroko, OTSUKA Hironori, MATSUNO Tetsuo, SEAMA Nobukazu, SEAMA Nobukazu

  2022, 日本地球惑星科学連合大会予稿集(Web), 2022


• Seismic velocity structure beneath Kikai-caldera, Japan, from seismic refraction survey

  Nagaya A., Fujie G., Kodaira S., Tanaka S., Yamamoto Y., Sugioka H., Miyamachi H., Matsuno T., Otsuka H., Suzuki K., Seama N.

  The Volcanological Society of Japan, 2022, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2022, 70 - 70, Japanese


• Chemical evolution of magma toward the catastrophic eruption at Kikai Caldera recorded in Chikyu SCORE tephra

  Hanyu Takeshi, Chang Q., Kaneko Katsuya, Nakaoka Reina, Kiyosugi Koji, Suzuki―Kamata Keiko, Yamamoto Yuzuru, Matsuno Tetsuo, Seama Nobukazu, Tatsumi Yoshiyuki

  Kikai submarine caldera caused several catastrophic eruptions. In order to understand the eruption processes and magmatic evolution, we measured chemical composition of tephra collected via the SCORE program with D/V Chikyu. We used submarine tephra from the K-Ah eruption (7300 years ago), that from the K-Tz eruption (95000 years ago), and that intercalated between the two catastrophic eruptions, the age of which is approximately 40000 years ago or younger. The tephra from the K-Tz eruption is predominated by felsic pyroclasts, but the presence of a few mafic pyroclasts suggests the contribution of mafic melts during the K-Tz eruption. The tephra intercalated between the two catastrophic eruptions have chemical composition similar to those of K-Ah, implying that the storage of felsic magmas commenced at least 40000 years ago toward the next catastrophic eruption of K-Ah.

  GEOCHEMICAL SOCIETY OF JAPAN, 2022, Abstracts of Annual Meeting of the Geochemical Society of Japan, 69, 96, Japanese


• Development of a 3D inversion code to consider ocean bottom magnetotelluric data including topographic distortion~forward modeling part~

  荒木将允, 松野哲男, 島伸和, 南拓人

  2021, 日本地球惑星科学連合大会予稿集(Web), 2021


• Sedimentary structures caused by submarine landslide southern Satsuma Peninsula

  山口寛登, 佐野守, 清水賢, 井和丸光, 島伸和, 島伸和, 山本由弦, 山本由弦, 大塚宏徳, 大塚宏徳, 松野哲男, 松野哲男, 巽好幸, 巽好幸

  2021, 日本地球惑星科学連合大会予稿集(Web), 2021


• Bathymetric Survey and Tsunami Modeling of a Submarine Landslide in Tosa-bae, Nankai trough

  黒住将弘, 馬場俊孝, 松野哲男, 佐野守, 今井健太郎

  2021, 日本地球惑星科学連合大会予稿集(Web), 2021


• Preliminary results of ocean bottom pressure observation around Kikai submarine caldera, SW Japan

  ASAI Yuko, SEAMA Nobukazu, HANYU Tomoko, MATSUNO Tetsuo, HIROSE Hitoshi, MINAMI Takuto, SUGIOKA Hiroko

  2021, 日本地球惑星科学連合大会予稿集(Web), 2021


• 3-D resistivity analysis around the Hyuga-nada area based on marine-MT data

  中村捷人, 市原寛, 後藤忠徳, 松野哲男, 多田訓子, 佐藤真也

  東京 : 物理探査学会, 2021, 物理探査学会学術講演会講演論文集, 144th, 68 - 71, Japanese


• Geochemical variation of magma at Kikai Caldera volcano recorded in Chikyu SCORE tephra

  羽生毅, CHANG Q., 金子克哉, 鈴木桂子, 中岡礼奈, 清杉孝司, 山本由弦, 松野哲男, 島伸和, 巽好幸

  The Volcanological Society of Japan, 2021, 日本火山学会講演予稿集, 2021, 75 - 75, Japanese


• 海底の鬼界アカホヤ噴火堆積物の特徴

  中岡礼奈, 鈴木桂子, 清水賢, 金子克哉, 島伸和, 清杉幸司, 松野哲男, 巽好幸, 羽生毅, 宮崎隆, TEJADA Maria Luisa G., 上木賢太

  2021, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2021


• 鬼界海底カルデラにおける物質科学的研究の現状

  清杉孝司, 巽好幸, 鈴木桂子, 金子克哉, 中岡礼奈, 山本由弦, 清水賢, 島伸和, 松野哲男, 菊池瞭平, 山口寛登, 羽生毅

  2021, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2021


• Ocean-Bottom Exploration Challenges on the Training Ship Fukae-maru : Summary of six exploration voyages

  Yano Yoshiji, Matsuno Tetsuo

  In April 2013, the Japanese Government settled on the second stage of an oceanic basic plan that emphasized the development of ocean resources and the enhancement of oceanic education. In light of this situation, KOBEC (Kobe Ocean-Bottom Exploration Center) was established at Kobe University on October 1, 2015. Afterwards, preparations for ocean-bottom exploration activities using the training ship Fukae-maru were advanced by KOBEC. KOBEC will develop various promotion programs for its activities, for instance, the development of exploitation technology of ocean-bottom resources and specially-designed exploration techniques, etc. centering on the advanced research of the ocean bottom. In the Review of Graduate School of Maritime Sciences, Kobe University No.14 (June, 2017), the actual situation of the early exploration activities in addition to sufficiency of the deployment and the equipment for new observation apparatus for ocean bottom exploration activities was investigated in detail. The routine exploration activities around Kikai Caldera and the accumulation of observation data recently progressed into full operations. The exploration activities and detailed report of ship services of the first six voyages after starting acquisition and accumulation of observation data are summarized in this paper. This report aims to be helpful in further developing exploration activities sequentially in the future. In addition, the progress of the further results of research and instructional activities of KOBEC challenges is considered.

  神戸大学大学院海事科学研究科, 2020, 神戸大学大学院海事科学研究科紀要, 17, 1 - 23, Japanese


• Short to long term morphological changes and migration of sand waves in a semi-enclosed sea: a case study in Okinose area of Osaka Bay

  小島響, 谷篤史, 松野哲男, 松野哲男, 佐野守, 島伸和, 島伸和, 遠藤徳孝, 大串健一, ZHANG Xu, 内山雄介

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• Structure of submarine mass-transport complexes(MTCs) southern Mt.Kaimon

  山口寛登, 佐野守, 清水賢, 井和丸光, 島伸和, 島伸和, 松野哲男, 松野哲男, 巽好幸, 巽好幸

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• Estimation of MT response function to reveal resistivity structure around the Hyuganada area

  中村捷人, 市原寛, 後藤忠徳, 松野哲男, 多田訓子, 佐藤真也

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• 3-D resistivity modeling around the Hyuganada area

  中村捷人, 市原寛, 後藤忠徳, 松野哲男, 多田訓子, 佐藤真也

  2020, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 148th


• 鬼界海底カルデラ火山における地球物理学的観測及び地質岩石学的調査

  羽生毅, 田中聡, 伊藤亜妃, 山本揚二朗, 宮崎隆, 浜田盛久, TEJADA Maria Luisa G., 上木賢太, VAGLAROV Bogdan S., MCINTOSH Iona, 小平秀一, 末次大輔, 田村芳彦, 藤江剛, 堀高峰, 三浦誠一, 多田訓子, 原口悟, 中島倫也, 中岡礼奈, 杉岡裕子, 松野哲男, 清杉孝司, 大塚宏徳, 鈴木桂子, 岡本信行, 金子克哉, 菊池瞭平, 角想子, 織井大樹, 荒木将允, 島伸和, 巽好幸, 浜野洋三

  2020, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2020


• 鬼界海底巨大カルデラ火山における二重カルデラ形成過程の解明-新青丸KS-19-17航海概要報告-

  島伸和, 清杉孝司, 中岡礼奈, 松野哲男, 金子克哉, 清水賢, 鈴木桂子, 岡本信行, 羽入朋子, 井和丸光, 阿部俊輔, 佐野守, 木村純一, 杉岡裕子, 巽好幸, 羽生毅, 新谷毅, 益田晴恵, 亀尾桂, 沖野郷子, 榎正憲, 石塚治

  2020, 海と地球のシンポジウム発表課題一覧・要旨集(CD-ROM), 2020


• Flow mechanism of Koya Ignimbrite

  Susuzki-Kamata Keiko, Nakaoka Reina, Kiyosugi Koji, Shimizu Satoshi, Iwamaru Hikaru, Matsuno Tetsuo, Seama Nobukazu, Tatsumi Yoshiyuki

  The Volcanological Society of Japan, 2019, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2019, 51 - 51, Japanese


• 海底MTアレイデータを用いた海洋上部マントルの一次元異方性電気伝導度構造の推定

  松野哲男, 馬場聖至, 歌田久司

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 四国沖大陸棚斜面の海底地すべり調査と津波計算

  GON Youdai, 馬場俊孝, 松野哲男, 林美鶴, 市原寛

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 開聞岳南方海域の崩れ地形の成因を海底地形とマルチチャンネル反射波地震探査から探る

  山口寛登, 清水賢, 井和丸光, 佐野守, 島伸和, 島伸和, 堀内美咲, 松野哲男, 松野哲男, 巽好幸, 巽好幸

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 火山ガラス組成に基づく鬼界カルデラ海底採取火山灰と幸屋火砕流堆積物の対比

  中岡礼奈, 鈴木桂子, 鈴木桂子, 清水賢, 巽好幸, 巽好幸, 金子克哉, 金子克哉, 清杉孝司, 清杉孝司, 島伸和, 島伸和, 松野哲男, 松野哲男, 西村公宏, 林和輝

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 大阪湾の海底に見られるサンドウェーブの移動

  小島響, 松野哲男, 松野哲男, 佐野守, 島伸和, 島伸和, 遠藤徳孝, 大串健一, 谷篤史

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• ROVによる鬼界カルデラ海底調査の予察的報告

  清杉孝司, 鈴木桂子, 両角春寿, 両角春寿, 巽好幸, 金子克哉, 中岡礼奈, 佐野守, 清水賢, 井和丸光, 島伸和, 松野哲男, 西村公宏, 林和輝, 堀内美咲

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 徳島県宍喰沖海底地すべり痕のマルチナロービーム測深

  馬場俊孝, 権容大, 松野哲男, 林美鶴, 市原寛

  2019, 歴史地震(Web), (34) (34)


• Summary of Kikai submarine caldera researches conducted by KOBEC (Kobe Ocean-Bottom Exploration Center)

  SEAMA Nobukazu, MATSUNO Tetsuo, KIYOSUGI Koji, SHIMIZU Satoshi, NAKAOKA Reina, SUZUKI-KAMATA Keiko, SETO Yasutomo, SANO Mamoru, MORITA Yuiko, IWAMARU Hikaru, MOROZUMI Haruhisa, HORIUCHI Misaki, NISHIMURA Kimihiro, ICHIHARA Hiroshi, HAYASHI Kazuki, HIROSE Toki, KANEKO Katsuya, YAMAGUCHI Hiroto, OKIZONO Yuki, SUGIOKA Hiroko, NAKAHIGASHI Kazuo, NAKAHIGASHI Kazuo, YAMAMOTO Yojiro, KODA Tatsuya, KODAIRA Shuichi, KODAIRA Shuichi, TATSUMI Yoshiyuki

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 鬼界カルデラのMT観測データの解析

  廣瀬時, 松野哲男, 松野哲男, 島伸和, 島伸和, 沖園雄希, 市原寛, 杉岡裕子, 杉岡裕子, 巽好幸, 巽好幸

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 鬼界カルデラ下の3次元電気比抵抗構造探査

  松野哲男, 松野哲男, 廣瀬時, 沖園雄希, 島伸和, 島伸和, 市原寛, 杉岡裕子, 杉岡裕子, 巽好幸, 巽好幸

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• 四国沖大陸棚斜面の海底地すべりの地形調査

  権容大, 馬場俊孝, 松野哲男, 林美鶴, 市原寛

  2018, 日本地震学会秋季大会講演予稿集(CD-ROM), 2018


• 南部マリアナ背弧拡大海嶺下の上部マントル比抵抗構造の解明

  松野哲男, 島伸和, 新藤悠, 野木義史, 沖野郷子

  2018, 地球電磁気・地球惑星圏学会総会及び講演会(Web), 144th


• 背弧海盆の非対称拡大を説明する仮説:南マリアナトラフでの観測事実と数値シミュレーション

  島伸和, 中久喜伴益, 松野哲男, 沖野郷子

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• The characteristics of seismic stratigraphic facies of Kikai submarine caldera and off the southern Kyusyu

  SHIMIZU Satoshi, SHIMIZU Satoshi, IWAMARU Hikaru, IWAMARU Hikaru, SEAMA Nobukazu, MATSUNO Tetsuo, ICHIHARA Hiroshi, ICHIHARA Hiroshi, SANO Mamoru, SANO Mamoru, SUGIOKA Hiroko, NAKAHIGASHI Kazuo, NAKAHIGASHI Kazuo, YAMAMOTO Yojiro, NISHIMURA Kimihiro, FURUKAWA Yuka, HORIUCHI Misaki, HIROSE Toki, SETO Yasutomo, TATSUMI Yoshiyuki

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• Integrated marine investigations of Kikai Caldera, SW Japan

  MATSUNO Tetsuo, TATSUMI Yoshiyuki, SEAMA Nobukazu, SUZUKI-KAMATA Keiko, ICHIHARA Hiroshi, ICHIHARA Hiroshi, KIYOSUGI Koji, NAKAOKA Reina, SHIMIZU Satoshi, SANO Mamoru, IWAMARU Hikaru, MOROZUMI Haruhisa, SUGIOKA Hiroko, NAKAHIGASHI Kazuo, NAKAHIGASHI Kazuo, YAMAMOTO Yojiro, HAYASHI Kazuki, NISHIMURA Kimihiro, FURUKAWA Yuka, HORIUCHI Misaki, NAKATA Daichi, NAKAMURA Ryoto, TOKI Hirose, SETO Yasutomo, OSHIGE Atsuhiro, TAKIZAWA Hideaki, CHIBA Tatsuro, KODAIRA Shuichi

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic thickness, and water content

  Matsuno Tetsuo, Suetsugu Daisuke, Baba Kiyoshi, Tada Noriko, Shimizu Hisayoshi, Shiobara Hajime, Isse Takehi, Sugioka Hiroko, Ito Aki, Obayashi Masayuki, Utada Hisashi

  2017, Earth and Planetary Science Letters, 462


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content

  MATSUNO Tetsuo, SUETSUGU Daisuke, UTADA Hisashi, BABA Kiyoshi, TADA Noriko, SHIMIZU Hisayoshi, SHIOBARA Hajime, ISSE Takehi, SUGIOKA Hiroko, ITO Aki

  2016, Conductivity Anomaly研究会論文集, 2016


• 太平洋プレートの沈み込みの影響を受けた南部マリアナ背弧拡大海嶺下の豊富で非対称な部分溶融

  松野哲男, 島伸和, 新藤悠, 野木義史, 沖野郷子

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content

  MATSUNO Tetsuo, SUETSUGU Daisuke, UTADA Hisashi, BABA Kiyoshi, TADA Noriko, SHIMIZU Hisayoshi, SHIOBARA Hajime, ISSE Takehi, SUGIOKA Hiroko, ITO Aki

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• 「ふつう」の海洋マントルの電気伝導度構造イメージング

  馬場聖至, 多田訓子, 松野哲男, LIANG pengfei, ZHANG Luolei, 清水久芳, 歌田久司

  2015, 日本地球惑星科学連合大会予稿集(Web), 2015


• 「ふつうの海洋マントル」プロジェクトにおけるマントル遷移層電気伝導度構造の解明

  松野哲男, 歌田久司, 馬場聖至, 清水久芳, 多田訓子

  2015, 日本地球惑星科学連合大会予稿集(Web), 2015


• 海底電磁気・地震同時観測データから推定する北西太平洋「ふつう」の海洋マントル遷移層の含水量

  松野哲男, 末次大輔, 歌田久司, 馬場聖至, 多田訓子, 清水久芳, 塩原肇, 一瀬建日, 杉岡裕子, 伊藤亜妃

  2015, 日本地震学会秋季大会講演予稿集, 2015


• 南マリアナトラフ背弧海盆の海底拡大系における地球物理学調査

  島伸和, 新藤悠, 佐藤利典, 水野真理子, 高田裕能, 松野哲男, 野木義史, 吉河秀郎, 沖野郷子, 山田知朗, 一瀬建日, 望月公廣, 篠原雅尚

  2014, ブルーアース要旨集, 2014


• 多目的関数最適化アルゴリズムにもとづくMT一次元異方性比抵抗構造インバージョン

  松野哲男, 馬場聖至

  2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th


• 南マリアナトラフ拡大軸にある海底熱水系下の電気伝導度構造

  木村真穂, 島伸和, 松野哲男, 多田訓子

  2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th


• 南マリアナトラフ背弧海盆拡大系における地球物理学的調査

  島伸和, 佐藤利典, 一瀬建日, 山田知朗, 水野真理子, 木村真穂, 柴田侑希, 新藤悠, 沖野郷子, 篠原雅尚, 望月公廣, 野木義史, 辻健, 松野哲男, 岡田聡, 樋泉昌之, 高江洲盛史, 岩本久則

  2011, ブルーアース要旨集, 2011


• ラウ背弧海盆下の2次元比抵抗構造の推定

  柴田侑希, 島伸和, 野木義史, 松野哲男, 木村真穂

  2011, 地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 130th


• 沈み込み・前弧・島弧・背弧系(中部マリアナ海域)の電気伝導度構造

  島伸和, 松野哲男, 岩本久則, 辻野良輔, 後藤忠徳, 末広潔, 馬場聖至, 馬場祐太, 米田朝美, 歌田久司, ALAN Chave, ROB Evans, ANTHONY White, GORAN Boren, GRAHAM Heinson, 鈴木啓吾, 小村舞, 青木美澄, 井戸美帆, 菅野真人

  Mar. 2008, しんかいシンポジウム予稿集, 24th, 38, Japanese


• 日本海新潟沖におけるメタンハイドレート域総合調査

  木下正高, 後藤忠徳, 笠谷貴史, 町山栄章, 高木亮, 松本良, 蛭田明宏, 石田泰士, 小谷亮介, 竹内瑛一, 松田ニーロ, 奥田義久, 佐藤幹夫, SNYDER Glen, 戸丸仁, 陸尊礼, 弘松峰男, ろ海龍, 島伸和, 松野哲男, 岩本久則, 大塚宏徳, 岡本拓, 渡辺俊樹, 宗輝, 上野珠民, 林央之, 畠山映, 杉山智彦, 大西桂介, 田中仁氏

  2006, しんかいシンポジウム予稿集, 22nd


• マリアナ諸島周辺のマントルウェッジ電気伝導度構造

  後藤忠徳, 島伸和, 馬場聖至, 多田訓子, 松野哲男, 野木義史, 歌田久司, 末広潔, 藤浩明

  Jan. 2003, しんかいシンポジウム予稿集, 19th, 126 - 127, Japanese

• 海底MTアレイデータを用いた海洋上部マントルの一次元異方性電気伝導度構造の推定

  松野 哲男, 馬場 聖至, 歌田 久司

  日本地球惑星科学連合2019年大会, May 2019, Japanese

  Oral presentation


• Migration of sand waves observed in Okinose area of Osaka Bay

  Kojima Hibiki, Tetsuo Matsuno, Mamoru Sano, Nobukazu Seama, Noritaka Endo, Ken'ichi Ohkushi, Atsushi Tani

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

  Oral presentation


• An investigation of three-dimensional electrical resistivity structure under Kikai Caldera

  Tetsuo Matsuno, Toki Hirose, Yuuki Okizono, Nobukazu Seama, Hiroshi Ichihara, Hiroko Sugioka, Yoshiyuki Tatsumi

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

  Oral presentation


• 鬼界カルデラ・アカホヤ噴火の水中火砕流の分布

  Satoshi Shimizu, Nobukazu Seama, Reina Nakaoka, Tetsuo Matsuno, Koji Kiyosugi, Hikaru Iwamaru, Mamoru Sano, Kimihiro Nishimura, Keiko Suzuki-Kamata, Katsuya Kaneko, Hiroto Yamaguchi, Misaki Horiuchi, Toki Hirose, Kazuki Hayashi, Yoshiyuki Tatsumi

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

  Oral presentation


• The Analysis of magnetotelluric sounding data on Kikai submarine caldera

  Toki Hirose, Tetsuo Matsuno, Nobukazu Seama, Yuki Okizono, Hiroshi Ichihara, Hiroko Sugioka, Yoshiyuki Tatsumi

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

  Oral presentation


• Investigating Origin of landslide-like bathymetric feature at southernMt.Kaimon using bathymetric and multichannel seismic reflectionsurveys

  Hiroto Yamaguchi, Satoshi Shimizu, Hikaru Iwamaru, Mamoru Sano, Nobukazu Seama, Misaki Horiuchi, Tetsuo Matsuno, Yoshiyuki Tatsumi

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

  Poster presentation


• Identification of submarine volcanic ash around the Kikai caldera with the Koya pyroclastic flow deposit inferred from glass composition

  Reina Nakaoka, Keiko Suzuki-Kamata, Satoshi Shimizu, Yoshiyuki Tatsumi, Katsuya Kaneko, Koji Kiyosugi, Nobukazu Seama, Tetsuo Matsuno, Kimihiro Nishimura, Kazuki Hayashi

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

  Oral presentation


• Summary of Kikai submarine caldera researches conducted by KOBEC(Kobe Ocean-Bottom Exploration Center)

  Nobukazu Seama, Tetsuo Matsuno, Koji Kiyosug, Satoshi Shimizu, Reina Nakaoka, Keiko Suzuki-Kamata, Yasutomo Seto, Mamoru Sano, Yuiko Morita, Hikaru Iwamaru, Haruhisa Morozumi, Misaki Horiuchi, Kimihiro Nishimura, Hiroshi Ichihara, Kazuki Hayashi, Toki Hirose, Katsuya Kaneko, Hiroto Yamaguchi, Yuki Okizono, Hiroko Sugioka, Kazuo Nakahigashi, Yojiro Yamamoto, Tatsuya Koda, Shuichi Kodaira, Yoshiyuki Tatsumi, Scientific Party of T, S Fukae-maru, Kikai caldera, research cruises

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

  Oral presentation


• Preliminary report of the sea floor survey by a remotely operatedvehicle (ROV) at the Kikai caldera, SW Japan

  Koji Kiyosugi, Keiko Suzuki-Kamata, Haruhisa Morozumi, Yoshiyuki Tatsumi, Katsuya Kaneko, Reina Nakaoka, Mamoru Sano, Satoshi Shimizu, Hikaru Iwamaru, Nobukazu Seama, Tetsuo Matsuno, Kimihiro Nishimura, Kazuki Hayashi, Misaki Horiuchi

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

  Oral presentation


• 南部マリアナ背弧拡大海嶺下の上部マントル比抵抗構造の解明

  MATSUNO TETSUO, SEAMA NOBUKAZU, SHINDO HARUKA, NOGI YOSHIFUMI, OKINO KYOKO

  地球電磁気・地球惑星圏学会 第144回総会及び講演会, Nov. 2018, Japanese, Domestic conference

  Poster presentation


• 四国沖大陸棚斜面の海底地すべりの地形調査

  Yodai GON, Toshitaka BABA, Tetsuo MATSUNO, Mitsuru HAYASHI, Hiroshi ICHIHARA

  日本地震学会2018年度秋季大会, Oct. 2018, Japanese, ビッグパレットふくしま（福島県郡山市）, Domestic conference

  Oral presentation


• 徳島県宍喰沖海底地すべり痕のマルチナロービーム測深

  Toshitaka BABA, Yodai GON, Tetsuo MATSUNO, Mitsuru HAYASHI, Hiroshi ICHIHARA

  日本歴史地震研究会, Sep. 2018, Japanese, Oita City, Domestic conference

  Oral presentation


• 背弧海盆の非対称拡大を説明する仮説：南マリアナトラフでの観測事実と数値シミュレーション

  島 伸和, 中久喜 伴益, 松野 哲男, 沖野 郷子

  日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• The characteristics of seismic stratigraphic facies of Kikai submarine caldera and off the southern Kyusyu

  Satoshi Shimizu, Hikaru Iwamaru, Nobukazu Seama, Tetsuo Matsuno, Hiroshi Ichihara, Mamoru Sano, Hiroko Sugioka, Kazuo Nakahigashi, Yojiro Yamamoto, Kimihiro Nishimura, Yuka Furukawa, Misaki Horiuchi, Toki Hirose, Yasutomo Seto, Yoshiyuki Tatsumi

  Japan Geoscience Union Meeting 2018, May 2018, Japanese, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• The significance of the surface excavation in the Kikai caldera, southern Kyushu

  Keiko Suzuki-Kamata, Yoshiyuki Tatsusmi, Kouji Kiyosugi, Reina Nakaoka, Nobukazu Seama, Tetsuo Matsuno, Satoshi Shimizu, Mamoru Sano, Hikaru Iwamaru

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conference

  Oral presentation


• Seafloor electromagnetic investigations of the upper mantle of the Mariana back-arc spreading and subduction system

  Tetsuo Matsuno, Nobukazu Seama

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, International conference

  Poster presentation


• Integrated marine investigations of Kikai Caldera, SW Japan

  Tetsuo Matsuno, Yoshiyuki Tatsumi, Nobukazu Seama, Keiko Suzuki-Kamata, Hiroshi Ichihara, Koji Kiyosugi, Reina Nakaoka, Satoshi Shimizu, Mamoru Sano, Hikaru Iwamaru, Haruhisa Morozumi, Hiroko Sugioka, Kazuo Nakahigashi, Yojiro Yamamoto, Kazuki Hayashi, Kimihiro Nishimura, Yuka Furukawa, Misaki Horiuchi, Daichi Nakata, Ryoto Nakamura, Hirose Toki, Yasutomo Seto, Atsuhiro Oshige, Hideaki Takizawa, Tatsuro Chiba, Shuichi Kodaira

  Japan Geoscience Union Meeting 2018, May 2018, Japanese, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading ridge under the influence of the Pacific plate subduction

  Matsuno Tetsuo, SeamaNobukazu, Shindo Haruka, Nogi Yoshifumi, Okino Kyoko

  American Geophysical Union 2017 Fall Meeting, Dec. 2017, English, New Orleans, USA, International conference

  Poster presentation


• 背弧海盆の非対称拡大はどのようにして起こるのか？-南マリアナトラフでの観測事実と数値シミュレーション-

  SEAMA NOBUKAZU, 中久喜 伴益, MATSUNO TETSUO, 沖野 郷子

  InterRidge-Japan研究集会, Nov. 2017, Japanese, 東京大学大気海洋研究所, Domestic conference

  Oral presentation


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content

  MATSUNO TETSUO, SUETSUGU DAISUKE, BABA KIYOSHI, TADA NORIKO, SHIMIZU HISAYOSHI, SHIOBARA HAJIME, ISSE TAKEHI, SUGIOKA HIROKO, ITO AKI, OBAYASHI MASAYUKI, UTADA HISASHI

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

  Oral presentation


• Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data

  MATSUNO TETSUO, BABA KIYOSHI, UTADA HISASHI

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

  Poster presentation


• Constraints on lithospheric mantle and crustal anisotropy in the NoMelt area from an analysis of long-period seafloor magnetotelluric data

  MATSUNO TETSUO, EVANS L. ROB

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

  Poster presentation


• Simple plate cooling model is no longer applicable to the upper mantle beneath the northwestern Pacific: Evidence from marine magnetotellurics

  馬場 聖至, 多田 訓子, MATSUNO TETSUO, 梁 朋飛, 李 蕊白, 張 羅磊, 清水 久芳, 阿部 なつ江, 平野 直人, 市來 雅啓, 歌田 久司

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

  Oral presentation


• Integrated offshore investigations in the vicinity of Kikai Caldera, southwestern Japan -towards a comprehensive understanding of destructive caldera eruptions-

  ICHIHARA HIROSHI, 橋本 順歩, 高橋 大和, 清水 賢, SANO MAMORU, MATSUNO TETSUO, SEAMA NOBUKAZU, 山本 揚二朗, 井和丸 光, 中東 和夫, 若林 伸和, 小平 秀一, TATSUMI YOSHIYUKI

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

  Oral presentation


• Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data

  MATSUNO TETSUO, 馬場 聖至, 歌田 久司

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

  Poster presentation


• 南東インド洋海嶺近傍における上部マントル比抵抗構造の推定

  川野 由貴, MATSUNO TETSUO, SEAMA NOBUKAZU

  海半球観測研究センター20周年シンポジウム「新たな観測が開く海半球の未来」, Mar. 2017, Japanese, 地震研究所, Domestic conference

  Poster presentation


• Enhanced and asymmetric melting beneath the southern Mariana back-arc spreading ridge, influenced by the subduction of the Pacific plate

  MATSUNO TETSUO, SEAMA NOBUKAZU, Haruka Shindo, Yoshifumi Nogi, Kyoko Okino

  23rd Electromagnetic Induction Workshop, Aug. 2016, English, The Empress Convention Center, International conference

  Poster presentation


• Electrical resistivity structure under the western Cosmonauts Sea at the continental margin of East Antarctica inferred via a marine magnetotelluric experiment

  MATSUNO TETSUO, Yoshifumi Nogi, SEAMA NOBUKAZU

  23rd Electromagnetic Induction Workshop, Aug. 2016, English, The Empress Convention Center, International conference

  Poster presentation


• Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content

  MATSUNO TETSUO, SUETSUGU DAISUKE, BABA KIYOSHI, TADA NORIKO, SHIMIZU HISAYOSHI, SHIOBARA HAJIME, ISSE TAKEHI, SUGIOKA HIROKO, ITO AKI, OBAYASHI MASAYUKI, UTADA HISASHI

  Japan Geoscience Union Meeting 2016, May 2016, English, International conference

  Oral presentation


• Upper mantle electrical resistivity structure beneath the Southwest Indian Ridge 37°E

  MATSUNO Tetsuo, MIZUMA Keiko, SEAMA Nobukazu, NOGI Yoshifumi, OKINO Kyoko

  2012 AGU Fall Meeting, Dec. 2012, English, AGU, San Francisco, USA, International conference

  Poster presentation


• Mantle to hydrothermal vent sites of the Southern Mariana Trough back-arc Basin: Results from the Taiga Project

  SEAMA Nobukazu, OKINO Kyoko, NOGI Yoshifumi, SATO Toshinori, MATSUNO Tetsuo, YOSHIKAWA Shuro, MOCHIZUKI Nobutatsu, SHINOHARA Masanao

  2012 AGU Fall Meeting, Dec. 2012, English, AGU, San Francisco, USA, International conference

  Oral presentation


• Electrical resistivity structure of the upper mantle in the Southern Mariana Trough

  SHINDO Haruka, SEAMA Nobukazu, MATSUNO Tetsuo, SHIBATA Yuki, KIMURA Maho, NOGI Yoshifumi, OKINO Kyoko

  2012 AGU Fall Meeting, Dec. 2012, English, AGU, San Francisco, USA, International conference

  Poster presentation


• 南マリアナトラフ拡大軸にある海底熱水系下の比抵抗構造推定

  KIMURA Maho, SEAMA Nobukazu, MATSUNO Tetsuo, TADA Noriko

  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, 幕張メッセ,千葉, Domestic conference

  Poster presentation


• 南マリアナトラフにおける上部マントルの比抵抗構造

  SHINDO Haruka, SEAMA Nobukazu, MATSUNO Tetsuo, KIMURA Maho, SHIBATA Yuki, OKINO Kyoko, NOGI Yoshifumi

  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, 幕張メッセ,千葉, Domestic conference

  Poster presentation


• 中部マリアナ背弧拡大軸下のマントル溶融域に対する電磁気学的な制約

  MATSUNO Tetsuo, EVANS, R.L, SEAMA Nobukazu

  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, 幕張メッセ,千葉, Domestic conference

  Oral presentation


• ラウ背弧海盆下の比抵抗構造の推定

  SHIBATA Yuki, SEAMA Nobukazu, MIZUMA Keiko, KIMURA Maho, KOBAYASHI Seiya, MATSUNO Tetsuo, NOGI Yoshifumi

  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, 幕張メッセ,千葉, Domestic conference

  Oral presentation


• Upper mantle electrical resistivity structure beneath back-arc spreading centers

  Seama, N, Shibata, Y, Kimura, M, Shindo, H, Matsuno, T, Nogi, Y, Okino, K

  2011 AGU Fall Meeting, Dec. 2011, English, AGU, San Francisco, USA, International conference

  Oral presentation


• Constraint on a melting regime in upper mantle beneath the central Mariana back-arc spreading center through the geophysical electromagnetic forward modeling

  Matsuno, T, Evans, R.L, Seama, N

  2011 AGU Fall Meeting, Dec. 2011, English, AGU, San Francisco, USA, International conference

  Poster presentation


• 南マリアナトラフ拡大軸にある海底熱水系下の電気伝導度構造

  木村 真穂, 島 伸和, 松野 哲男, 多田 訓子

  地球電磁気・地球惑星圏学会第130回総会・講演会, Nov. 2011, Japanese, 地球電磁気・地球惑星圏学会, 神戸大学，兵庫, Domestic conference

  Oral presentation


• ラウ背弧海盆下の2次元比抵抗構造の推定

  柴田 侑希, 島 伸和, 野木 義史, 松野 哲男, 木村 真穂

  地球電磁気・地球惑星圏学会第130回総会・講演会, Nov. 2011, Japanese, 地球電磁気・地球惑星圏学会, 神戸大学，兵庫, Domestic conference

  Oral presentation


• Estimation of 2-D resistivity structure beneath the Lau back-arc Basin

  Shibata, Y, Seama, N, Mizuma, K, Kimura, M, Kobayashi, S, Matsuno, T, Nogi, Y

  Workshop on Ocean Mantle Dynamics: from Spreading Center to Subduction Zone, Oct. 2011, English, Chiba, Japan, International conference

  Poster presentation


• Electrical conductivity structure of the upper mantle beneath in the southern Mariana Trough

  Shindo, H, Seama, N, Kimura, M, Shibata, Y, Matsuno, T, Nogi, Y, Okino, K

  Workshop on Ocean Mantle Dynamics: from Spreading Center to Subduction Zone, Oct. 2011, English, Chiba, Japan, International conference

  Poster presentation


• Electrical conductivity structure of a seafloor hydrothermal system at the southern Mariana Trough spreading axis

  Kimura, M, Seama, N, Matsuno, T, Tada, N

  Workshop on Ocean Mantle Dynamics: from Spreading Center to Subduction Zone, Oct. 2011, English, Chiba, Japan, International conference

  Poster presentation


• Constraint on a melting regime in upper mantle beneath the central Mariana back-arc spreading center through the geophysical electromagnetic forward modeling

  Matsuno, T, Evans, R.L, Seama, N

  Workshop on Ocean Mantle Dynamics: from Spreading Center to Subduction Zone, Oct. 2011, English, Chiba, Japan, International conference

  Poster presentation

• 日本地球惑星科学連合


• 日本地震学会


• 地球電磁気・地球惑星圏学会

• International collaborative research on the viscosity of the oceanic asthenosphere through marine geophysical observations and geodynamic modeling

  馬場 聖至, 一瀬 建日, 竹内 希, 竹尾 明子, 森重 学, 杉岡 裕子, 松野 哲男, 多田 訓子, 市原 寛

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 01 Apr. 2023 - 31 Mar. 2027


• 巨大カルデラ噴火を導いたマグマ供給系の現状把握

  島 伸和, 山本 揚二朗, 松野 哲男, 伊藤 亜妃

  日本学術振興会, 科学研究費助成事業 基盤研究(A), 基盤研究(A), 神戸大学, 01 Apr. 2020 - 31 Mar. 2024

  研究目的を達成するために、鹿児島市の南約100kmの海域に位置する「鬼界海底カルデラ火山」を対象として、この巨大カルデラ火山のマグマ供給系全体の地球物理学的なイメージングを実施する。これにより、鬼界カルデラ直下に存在すると考えられる特徴的な構造の位置や大きさ等を把握する。 本年度は、巨大カルデラ火山のマグマ供給系全体のイメージングのために、海底および陸上での地震観測と海底電磁気観測を開始した。 ・観測に必要な機器である、広帯域海底地震計（BBOBS）、短周期海底地震計（SPOBS）、海底磁力計（OBM）、海底電位差磁力計（OBEM）、陸上用の広帯域地震計の準備を行った。BBOBS、SPOBS、OBEMについては、電池、切り離し部品を含む錘などの必要な消耗品を購入し、海底に設置するための整備を行った。OBMをSPOBSに取り付けるための治具の作成やその準備を行った。また、OBMの専用データロガーを4台購入して台数を増やした。一方、陸上用の広帯域地震計は、1セット分を購入するともに、必要な消耗品を購入して既存の分の整備も行った。 ・9月～10月に実施されたJAMSTECの深海調査研究船「かいれい」のKR20-11航海に必要な準備を行った。この航海により「鬼界海底カルデラ火山」とその周辺海域の海底に、BBOBS、SPOBS、OBM、OBEMの設置を行い、海底での観測を開始した。 ・臨時陸上観測点は、鬼界カルデラに近い三島村、および水深上の制約で海底地震計の設置が難しい鬼界カルデラ東方をカバーするために種子島と屋久島に、広帯域地震計を設置し、陸上での地震観測を開始した。 ・2月～3月に実施された神戸大学の練習船「深江丸」の航海により、8台のOBEMを回収した。回収したOBEMにより得られた海底電磁場変動データを確認し、その観測データの解析を開始した。


• Inovation for the imaging of water in the mantle transition zone using seafloor electromagnetic array data

  BABA Kiyoshi, FUJII Ikuko, FUJITA Shigeru, MATSUNO Tetsuo

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), The University of Tokyo, 01 Apr. 2015 - 31 Mar. 2019

  This study aims to investigate the distribution of water in the mantle transition zone beneath the western Pacific region using the seafloor electromagnetic observation data collected by our research group in the last decade. For this purpose, we focused on the natural magnetic field variations in the period range that the data is sensitive to the depth of the mantle transition zone, and attempted to develop new analysis methods; 1) separating the complex magnetic field components from the observed data, and 2) incorporating the complex spacial distribution of the magnetic field which is used for the inversion analysis to image the electrical conductivity in the mantle transition zone.


• Investigation on upper mantle heterogeneity through sea-floor spreading system

  Seama Nobukazu, Nakakuki Tomoeki, Nakahigashi Kazuo, Nogi Yoshifumi, Morishita Tomoaki, Sato Hiroshi, Harigane Yumiko, Ogawa Kazunori

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2015 - Mar. 2019

  Our main results of 2-D electrical resistivity structure and of numerical simulation lead us to propose a hypothesis that the low viscosity region in the mantle wedge due to hydration driven by water release from the subducting slab results in highly asymmetric seafloor spreading, which is commonly recognized in many back-arc basins. The resistivity structure was imaged through marine magnetotelluric experiment across a spreading segment in the Southern Mariana Trough back-arc basin. This result shows that a low resistivity region exists beneath the spreading axis and is asymmetrically extended to the subducting slab; the low resistivity region is interpreted as asymmetric melting in the mantle wedge due to hydration driven by water release from the subducting slab. Further, numerical simulation results indicate that the spreading axis is kept locating above the low viscosity mantle zone that capture the mantle upwelling zone due to water release from the subducting slab.


• Melt region structures beneath back-arc basin spreading centers

  SEAMA Nobukazu, NOGI Yoshifumi, NAKAKUKI Tomoeki, TAKEI Yasuko, MATSUNO Tetsuo

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 2009 - 2011

  Investigations on melt region structures beneath spreading axes are a key to understand back-arc spreading system. We developed a compact ocean bottom magnetometer(OBM), which was designed to be attached to US ocean bottom seismograph(OBS); that became first ocean bottom seismograph and magnetometer(OBSM) in the world achieved by an international cooperation. We carried out one year ocean bottom observation near the Eastern Lau spreading axis using the instruments. Marine magnetotelluric analysis using ocean bottom data allows us to image the resistivity structures of the upper mantle beneath the spreading axis, which were compared to identify differences in melt region structures and to understand the cause of the differences.