Updated on 2022/04/21

写真a

 
ICHIHARA Hiroshi
 
Organization
Graduate School of Environmental Studies Earthquake and Volcano Research Center Lecturer
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Science Department of Earth and Planetary Science
Title
Lecturer
External link

Degree 1

  1. 博士(理学) ( 2008.3   北海道大学 ) 

Research Areas 1

  1. Natural Science / Solid earth sciences

Research History 10

  1. Nagoya University   Lecturer

    2021.11

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    Country:Japan

  2. Nagoya University   Assistant Professor

    2017.6 - 2021.10

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    Country:Japan

  3. Kobe University   KOBEC

    2016.4 - 2017.5

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    Country:Japan

  4. 海洋研究開発機構   地震津波観測研究開発センター   招聘技術研究員(中断期間有)

    2015.11 - 2017.3

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    Country:Japan

  5. Kobe University   Graduate school of maritime sciences

    2015.10 - 2016.3

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    Country:Japan

  6. GNS Science   Guest Scientist

    2013.11 - 2014.10

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    Country:New Zealand

  7. The University of Tokyo

    2009.5 - 2016.3

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    Country:Japan

  8. Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

    2009.4 - 2015.9

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    Country:Japan

  9. The University of Tokyo   Earthquake Research Institute

    2008.4 - 2009.3

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    Country:Japan

  10. Japan Society for Promotion of Science

    2006.4 - 2008.3

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    Country:Japan

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Education 3

  1. Hokkaido University   Graduate School, Division of Natural Science

    2005.4 - 2008.3

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    Country: Japan

  2. Ehime University   Graduate School, Division of Science and Engineering

    2003.4 - 2005.3

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    Country: Japan

  3. Ehime University   Faculty of Science

    1999.4 - 2003.3

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    Country: Japan

Professional Memberships 4

  1. 地球電磁気・地球惑星圏学会   将来構想WG

    2018.1

  2. 物理探査学会   会誌編集委員

    2013.6

  3. 日本地質学会

  4. 日本地震学会

Committee Memberships 1

  1. 5th International Symposium on Three-Dimensional Electromagnetics "Future Challenges"   LOC and convener  

    2012 - 2013   

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    Committee type:Academic society

Awards 3

  1. 大林奨励賞

    2016   地球電磁気・地球惑星圏学会  

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    Country:Japan

  2. 第117回学術講演会優秀講演賞

    2007   物理探査学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  3. 第113年学術大会優秀講演賞

    2006   日本地質学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

 

Papers 51

  1. Drift of an ocean bottom electromagnetometer from the Bonin to Ryukyu Islands: estimation of the path and travel time by numerical tracking experiments Reviewed

    EARTH PLANETS AND SPACE   Vol. 73 ( 1 )   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-021-01552-8

    Web of Science

  2. Magnetization structure of Nishinoshima volcano, Ogasawara island arc, obtained from magnetic surveys using an unmanned aerial vehicle Reviewed

    Noriko Tada, Hiroshi Ichihara, Masaru Nakano, Mitsuru Utsugi, Takao Koyama, Tatsu Kuwatani, Kiyoshi Baba, Fukashi Maeno, Akimichi Takagi, Minoru Takeo

    Journal of Volcanology and Geothermal Research   Vol. 419   page: 107349   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jvolgeores.2021.107349

  3. Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings Reviewed

    Ichihara Hiroshi, Mogi Toru, Uchida Toshihiro, Satoh Hideyuki, Yamaya Yusuke, Fujii Masakazu, Yamazaki Shusaku, Okazaki Kenji, Tada Noriko

    EARTH PLANETS AND SPACE   Vol. 73 ( 1 )   2021.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-021-01482-5

    Web of Science

  4. タール火山(フィリピン)で2020年1月に起こった噴火の概要と防災対応 Reviewed

    熊谷 博之, 濵本, 未希, 市原 寛

    火山   Vol. 66 ( 1 ) page: 45 - 53   2021.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.18940/kazan.66.1_45

  5. Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan Reviewed

    Aizawa Koki, Takakura Shinichi, Asaue Hisafumi, Koike Katsuaki, Yoshimura Ryokei, Yamazaki Ken'ichi, Komatsu Shintaro, Utsugi Mitsuru, Inoue Hiroyuki, Tsukamoto Kaori, Uyeshima Makoto, Koyama Takao, Kanda Wataru, Yoshinaga Tohru, Matsushima Nobuo, Uchida Kazunari, Tsukashima Yuko, Matsushima Takeshi, Ichihara Hiroshi, Muramatsu Dan, Teguri Yoshiko, Shito Azusa, Matsumoto Satoshi, Shimizu Hiroshi

    EARTH PLANETS AND SPACE   Vol. 73 ( 1 )   2021.1

  6. Method for obtaining response functions from noisy magnetotelluric data using frequency-domain independent component analysis Reviewed

    Sato Shinya, Goto Tada-Nori, Kasaya Takafumi, Ichihara Hiroshi

    GEOPHYSICS   Vol. 86 ( 1 ) page: E21 - E35   2021

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    Language:Japanese  

    DOI: 10.1190/GEO2018-0792.1

    Web of Science

  7. Two independent signals detected by ocean bottom electromagnetometers during a non-eruptive volcanic event: Ogasawara Island arc volcano, Nishinoshima Reviewed

    Baba Kiyoshi, Tada Noriko, Ichihara Hiroshi, Hamano Yozo, Sugioka Hiroko, Koyama Takao, Takagi Akimichi, Takeo Minoru

    EARTH PLANETS AND SPACE   Vol. 72 ( 1 )   2020.8

  8. Electrical resistivity imaging of the inter-plate coupling transition at the Hikurangi subduction margin, New Zealand Reviewed International coauthorship

    Heise Wiebke, Ogawa Yasuo, Bertrand Edward A., Caldwell T. Grant, Yoshimura Ryokei, Ichihara Hiroshi, Bennie Stewart L., Seki Kaori, Saito Zenshiro, Matsunaga Yasuo, Suzuki Atsushi, Kishita Takahiro, Kinoshita Yusuke

    EARTH AND PLANETARY SCIENCE LETTERS   Vol. 524   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2019.115710

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

    Baba Toshitaka, Gon Yodai, Imai Kentaro, Yamashita Kei, Matsuno Tetsuo, Hayashi Mitsuru, Ichihara Hiroshi

    TECTONOPHYSICS   Vol. 768   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.tecto.2019.228182

    Web of Science

  10. Electrical resistivity modeling around the Hidaka collision zone, northern Japan: regional structural background of the 2018 Hokkaido Eastern Iburi earthquake (M-w 6.6) Reviewed

    Ichihara Hiroshi, Mogi Toru, Satoh Hideyuki, Yamaya Yusuke

    EARTH PLANETS AND SPACE   Vol. 71 ( 1 )   2019.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-019-1078-7

    Web of Science

  11. A 3D electrical resistivity model around the focal zone of the 2017 southern Nagano Prefecture earthquake (MJMA 5.6): implications for relationship between seismicity and crustal heterogeneity Reviewed

    Hiroshi Ichihara, Junna Kanehiro, Toru Mogi, Koshun Yamaoka, Edward Bertrand, Mamoru Adachi

    Earth, Planets and Space   Vol. 70 ( 182 )   2018.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-018-0950-1

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  12. A New Miniaturized Magnetometer System for Long-Term Distributed Observation on the Seafloor Reviewed

    1) Kazunori Ogawa, Tetsuo Matsuno, Hiroshi Ichihara, Kazuo Nakahigashi and Nobukazu Seama

    Earth, Planet, Space   Vol. 70   2018.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-018-0877-6

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  13. Report: The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau Reviewed

    Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Noriko Tada, Aki Ito, Takehi Isse, Kiyoshi Baba, Hiroshi Ichihara, Toyonobu Ota, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi, Hisashi Utada

    JAMSTEC-R   Vol. 26   page: 54-64   2018.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5918/jamstecr.26.54

  14. 議論:海陸の3次元比抵抗モデリングにおけるメッシュデザインについて

    市原 寛, 多田 訓子

    2018年 Conductivity Anomaly研究会論文集     page: 102-104   2018.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

  15. 御嶽山南東麓での MT 法による地熱探査

    金廣純奈, 茂木 透, 市原 寛, 山岡耕春, 足立 守, 田中 良

    2018年 Conductivity Anomaly研究会論文集     page: 94-99   2018.3

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

  16. Giant rhyolite lava dome formation after 7.3 ka supereruption at Kikai caldera, SW Japan Reviewed

    Yoshiyuki Tatsumi, Keiko Suzuki-Kamata, Tetsuo Matsuno, Hiroshi Ichihara, Nobukazu Seama, Koji Kiyosugi, Reina Nakaoka, Kazuo Nakahigashi, Hideaki Takizawa, Kazuki Hayashi, Tatsuro Chiba, Satoshi Shimizu, Mamoru Sano, Hikaru Iwamaru, Haruhisa Morozumi, Hiroko Sugioka, Yojiro Yamamoto

    Scientific Reports   Vol. 8   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: doi:10.1038/s41598-018-21066-w

  17. Three-dimensional time domain simulation of tsunami-generated electromagnetic fields: application to the 2011 Tohoku earthquake tsunami Reviewed

    Takuto Minami, Hiroaki Toh, Hiroshi Ichihara, Issei Kawashima

    J. Geophys. Res.   Vol. 122   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2017JB014839

  18. Mapping subduction interface coupling using magnetotellurics; Hikurangi Margin, New Zealand Reviewed

    W. Heise, T.G. Caldwell, S. Bannister, E.A. Bertrand, Y. Ogawa, S.L. Bennie,H. Ichihara

    Geophys. Res. Lett.   Vol. 44   2017

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2017GL074641

  19. Noise-reduction method of magnetotelluric data based on frequency-domain independent component analysis Reviewed

    Shinya Sato, Tada-Nori Goto, Takafumi Kasaya, and Hiroshi Ichihara

    SEG Technical Program Expanded Abstracts 2017     page: 1241-1245   2017

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    DOI: 10.1190/segam2017-17727472.1

  20. 3-D electrical resistivity modeling of the southern Hidaka collision zone, northern Japan: constraints for arc-arc collision tectonics and earthquakes Reviewed

    H. Ichihara, T. Mogi, K. Tanimoto, Y. Yamaya, T. Hashimoto, M. Uyeshima and Y. Ogawa

    Geochemistry, Geophysics, Geosystems.   Vol. 17   2016

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/2015GC006222

  21. Investigations of shallow slow slip offshore of New Zealand

    R. Harris, L. Wallace, S. Webb, Y. Ito, K. Mochizuki, H. Ichihara, S. Henry , A. Tréhu , S. Schwartz, A. Sheehan, R. Lauer, D. Saffer

    Eos   Vol. 97   2016

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    Language:English  

    DOI: 10.1029/2016EO048945

  22. Tsunami-induced Magnetic Fields Detected at Chichijima Island before the Arrival of the 2011 Tohoku Earthquake Tsunami Reviewed

    H. Tatehata, H. Ichihara and Y. Hamano

    Earth Planets Space   Vol. 67   2015

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-015-0347-3

  23. A 3-D electrical resistivity model beneath the focal zone of the 2008 Iwate-Miyagi Nairiku earthquake (M 7.2) Reviewed

    H. Ichihara, S. Sakanaka, M. Mishina, M. Uyeshima, T. Nishitani, Y. Ogawa, Y. Yamaya, T. Mogi, K. Amita and T. Miura

    Earth Planets Space   Vol. 66   2014

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/1880-5981-66-50

  24. Tsunami source of the 2011 Tohoku earthquake detected by an ocean-bottom magnetometer Reviewed

    H. Ichihara, Y. Hamano, K. Baba and T. Kasaya

    Earth Planet. Sci. Lett   Vol. 382   2013

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2013.09.015

  25. Three-dimensional resistivity modeling of a seismogenic area on an oblique subduction zone in western Kurile arc: constraints from anomalous magnetotelluric phases Reviewed

    H. Ichihara, T. Mogi, and Y. Yamaya

    Tectoniphysics   Vol. 603   2013

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.tecto.2013.05.020

  26. Developing new magnetometer system for marine EM survey Reviewed

    Kasaya, T., H. Ichihara and T. Goto

    Proceedings of the 11th SEGJ International Symposium     page: 339-341   2013

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  27. Ocean bottom EM observations around the seismo-genic zone of the 2011 Tohoku earthquake (M9.0)

    Ichihara, H., T. Kasaya, K. Baba and Y. Hamano

    Extended Abstract, 21st EM Induction Workshop     page: S5.9   2012

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  28. A fault-zone conductor beneath a compressional inversion zone, northeastern Honshu, Japan Reviewed

    H. Ichihara, M. Uyeshima, S. Sakanaka, T. Ogawa, M. Mishina, Y. Ogawa, T. Nishitani, Y. Yamaya, A. Watanabe, Y. Morita, R. Yoshimura, and Y. Usui

    Geophys. Res. Lett.,   Vol. 38   2011

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2011gl047382

  29. 地殻・上部マントル電気比抵抗構造:観測の原理・精度と物性データの現状 Reviewed

    市原 寛, 市來 雅啓

    岩石鉱物科学   Vol. 40   page: 73-90   2011

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    Authorship:Lead author   Language:Japanese  

  30. 北海道東部弟子屈地域の重力異常

    本多亮, 市原寛, 神山裕幸, 茂木透, 中川光弘

    北海道大学地球物理学研究報告   Vol. 74   page: 21-43   2011

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  31. 屈斜路カルデラ周辺におけるMT 法による比抵抗探査

    本多亮, 山谷祐介, 市原寛, 長谷英彰, 茂木透, 山下晴之, 大山倫敦, 上嶋誠, 中川光弘

    北海道大学地球物理学研究報告   Vol. 74   page: 45-55   2011

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  32. 海底資源探査に向けた磁気探査装置の開発 -R/V「よこすか」YK09-09 航海における実海域試験-

    原田誠, 佐柳敬造, 伊勢崎修弘, 笠谷貴史, 澤隆雄, 浅田美穂, 多田訓子, 市原寛, 後藤忠徳, 野木義史, 大西信人, 松尾淳

    東海大学紀要海洋学部「海ー自然と文化」   Vol. 8   page: 23-40   2010

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  33. Three dimensional conductor models explaining out of quadrant magnetotelluric phases

    Ichihara, H., T. Mogi, M. Uyeshima and S. Sakanaka

    IAGA WG 1.2 on Electromagnetic Induction in the Earth 20th Workshop Extended Abstract     page: S1-O4   2010

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    Authorship:Lead author   Language:English  

  34. 日本海東縁ひずみ集中帯(庄内—新庄地域)の比抵抗構造イメージング

    市原寛, 上嶋誠, 坂中伸也, 小河勉, 三品正明, 小川康雄, 西谷忠師, 山谷祐介, 渡邊篤志, 森田裕一, 吉村令慧, 臼井嘉哉

    月刊地球   Vol. 32   page: 417-424   2010

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    Authorship:Lead author   Language:Japanese  

  35. A realistic 3-D resistivity model explaining anomalous large magnetotelluric phases: the L-shaped conductor model Reviewed

    H. Ichihara, T. Mogi

    Geophys J Int   Vol. 179   2009

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/j.1365-246X.2009.04310.x

  36. Hydrothermal system beneath the crater of Tarumai volcano, Japan: 3-D resistivity structure revealed using audio-magnetotellurics and induction vector Reviewed

    Y. Yamaya, T. Mogi, T. Hashimoto, and H. Ichihara

    Journal of Volcanology and Geothermal Research     2009

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jvolgeores.2009.09.008

  37. Resistivity and density modelling in the 1938 Kutcharo earthquake source area along a large caldera boundary Reviewed

    H. Ichihara, T. Mogi, H. Hase, T. Watanabe, and Y. Yamaya

      Vol. 61   page: 345-356   2009

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  38. The L-shaped conductor model explaining anomalous large magnetotelluric phases

    Ichihara, H. and T. Mogi

    Proceedings of the SEGJ international symposium     page: ID:79   2009

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  39. 有珠火山東麓におけるMT法電磁探査

    高倉伸一, 橋本武志, 小川康雄, 井上寛之, 山谷祐介, 市原寛, 茂木透, 宇津木充, 松島善雄, 佐藤秀幸

    北海道大学地球物理学研究報告   Vol. 72   page: 107-115   2009

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  40. 有珠2000年新山域の比抵抗構造

    橋本武志, 小川康雄, 高倉伸一, 山谷祐介, 市原寛, 宇津木充, 井上寛之, 小池哲司, 長谷川浩, 茂木透

    北海道大学地球物理学研究報告   Vol. 72   page: 79-105   2009

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  41. MT法による黒松内地域の地下構造

    平田貴一, 茂木透, 山谷祐介, 長谷英彰, 山谷祐介, 市原寛

    北海道大学地球物理学研究報告   Vol. 72   page: 387-398   2009

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  42. Resistivity structure around the focal area of the 2004 Rumoi-Nanbu earthquake (M 6.1), northern Hokkaido, Japan Reviewed

    H. Ichihara, R. Honda, T. Mogi, H. Hase, H. Kamiyama, Y. Yamaya, and Y. Ogawa

    Earth Planets Space   Vol. 60   page: 883-888   2008

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  43. Magnetotelluric observations around the focal region of the 2007 Noto Hanto Earthquake (M-j 6.9), Central Japan

    Yoshimura, R., Oshiman, N., Uyeshima, M., Ogawa, Y., Mishina, M., Toh, H., Sakanaka, S., Ichihara, H., Shiozaki, I., Ogawa, T., Miura, T., Koyama, S., Fujita, Y., Nishimura, K., Takagi, Y., Imai, M., Honda, R., Yabe, S., Nagaoka, S., Tada, M., Mogi, T.

    Earth Planets Space   Vol. 60   page: 117-122   2008

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  44. 2004 年留萌支庁南部地震震源域の重力測定

    本多亮, 神山裕幸, 山口照寛, 市原寛, 茂木透

    北海道大学地球物理学研究報告   Vol. 70   page: 27-41   2007

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  45. 1938年屈斜路地震断層周辺の比抵抗および密度構造

    市原寛, 茂木透, 長谷英彰, 渡邉朋典, 山谷祐介

    CA研究会2007年論文集     page: 1-8   2007

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  46. 広帯域MT観測および重力測定による北海道東部弟子屈地域の地殻構造

    市原寛, 茂木透, 山谷祐介, 神山裕幸, 小川康雄

    北海道大学地球物理学研究報告   Vol. 69   page: 233-255   2006

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  47. 重力異常およびボーリング資料による松山平野北部, 堀江低地の地下構造 Reviewed

    市原 寛, 榊原 正幸, 大野 一郎

    地質学雑誌   Vol. 110 ( 12 ) page: 746-757   2004

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  48. 松山平野下の基盤構造および第四系

    榊原正幸・大野一郎・市原寛・岩崎仁美

    四国の自然災害と防災(土木学会四国支部)   Vol. 3   page: 98-124   2004

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  49. 松山平野北部, 堀江低地の基盤構造

    市原寛・榊原正幸・大野一郎

    地盤災害・地盤環境問題論文集(地盤工学会四国支部)   Vol. 3   page: 141-154   2003

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

  50. 松山平野周辺の地盤地質およびボーリングコア中のテフラの対比

    榊原正幸・岩崎仁美・市原寛

    地域防災研究(愛媛大学地域防災研究会)   Vol. 1   page: 5-38   2003

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  51. 松山平野周辺の地盤地質

    榊原正幸・小松正幸・市原寛

    愛媛大学芸予地震学術調査団最終報告書     page: 101-112   2002

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    Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

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Research Project for Joint Research, Competitive Funding, etc. 2

  1. 海底カルデラ地下構造探査手法の検討

    2016.10 - 2017.3

    出資金による受託研究 

  2. 組み合わせ最適化アルゴリズムによる電磁気、重力インバージョンおよびその評価法の開発

    2005

    日本科学財団笹川研究助成 

    市原 寛

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    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 13

  1. Precise volcano monitoring by actively controlled electromagnetic signal using frequency comb

    Grant number:20H01992  2020.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s) 

  2. 難観測域解消のための遠隔電場観測手法の開発

    Grant number:20K04105  2020.4 - 2023.3

    市原 寛

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    Authorship:Principal investigator 

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    近年、火山山頂部および火山島などの「観測の空白域」において、ドローンを用いた遠隔観測が注目されている。しかし、深部比抵抗構造の解明に重要な電場観測は難易度が高く研究例はない。本研究は、海底で先行している遠隔電場観測の技術を応用してドローン電場観測を行い、陸上の「観測の空白域」における地下の電気比抵抗構造の解明を可能にすることを目的とする。令和2-3年度はおもに装置の開発を行い、令和3-4年度に検証試験および研究成果の発表を行う計画である。本観測によって得られた知見は、将来的に月および火星等における惑星内部構造解明に向けた探査にも活用可能であると期待される。

  3. Understanding the magma system at Taal volcano, Philippines, based on in-situ geophysical observations

    Grant number:19KK0084  2019.10 - 2023.3

    Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Authorship:Coinvestigator(s) 

  4. Can we understand strength and hydraulic permeability of a large fracture zone by using geophysical technique?

    Grant number:18H03894  2018.4 - 2022.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

  5. 海底電磁場データを利用した西之島の火山活動の解明と噴火予測

    Grant number:18H01319  2018.4 - 2022.3

    科学研究費助成事業  基盤研究(B)

    多田 訓子, 馬場 聖至, 市原 寛

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    Authorship:Coinvestigator(s) 

    西之島は2013年11月に活動を再開した小笠原弧の火山島で、太平洋プレートの沈み込みによる島弧火山活動・大陸地殻の形成過程を理解する上で貴重なフィールドである。本研究では、西之島とその周辺の海底下の電気伝導度構造を求めることによって、西之島火山の内部構造を調べるとともに、磁場・電場・傾斜の時間変動から、西之島火山の活動の実体に迫る。そのために、我々は海底に海底電位磁力計(OBEM)を設置し、データを取得してきた。2019年6月の気象庁「啓風丸」航海で、昨年度に設置したOBEM4台を回収した。
    一方で、ポタシウム磁力計を搭載したドローンを利用して、西之島上空の全磁力をマッピングした。得られる全磁力分布は、西之島を形成する浅部の岩石の磁化構造を反映すると考えられる。磁化構造を求めることで、構成岩石の分布や温度分布を求めることができると期待できる。
    得られたOBEMやポタシウム磁力計のデータは、現在解析中である。
    2016年の観測データから得られた磁場と傾斜の変動については、論文を執筆中である。
    2020年1月には西之島電磁気観測第2回報告会を開催し、今年度実施した観測および来年度の計画について情報交換と議論を行った。
    2019年8月5日から予定していたOBEMの回収航海が台風8号、9号、および10号の発生により実施できなかった。そのため、2019年度中に全てのOBEMの回収を予定していたが、2020年度に繰越になった。
    2019年8月の回収航海が実施できなかったため、一部の観測機器が未回収である。来年度は、回収可能な航海の機会を模索するとともに、西之島の暫定の三次元電気伝導度構造を推定する。暫定構造を求めておくことで、全てのデータが揃った後に、より速やかに三次元電気伝導度構造を求めることができると考えられる。
    一方、ドローンで取得した西之島上空の全磁力データの解析を行い、西之島浅部の磁化構造などを推定する。

  6. Study on Seismic and Electromagnetic Subsurface Structure around the Source of Slow Earthquakes

    Grant number:16H06475  2016.6 - 2021.3

    Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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  7. Integrated analyses of marine and land magnetotelluric data for investigations of fluid distribution in megathrust earthquake zones

    Grant number:16K17793  2016.4 - 2020.3

    Ichihara Hiroshi

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Integrated analyses of marine and land magnetotelluric data are important to understand fluid distribution in subduction zones. However, “coastal effect” due to 3-D seawater distribution is essential problem for this purpose. In this study, we firstly obtained ocean bottom mangetotelluric data in the shallow sea areas where long term observation had not been carried out. The estimated MT impedances showed the coastal effect especially at the period between 100-1000 second. Then we investigated the applicability of the 3-D forward/inversion code for magnetotelluric data. The results showed that the code explained coastal effect and 3-D resistivity modeling was feasible.

  8. Exploring Large Igneous Provinces: Determination of crust and mantle structure beneath the Ontong Java Plateau by marine geophysical observation

    Grant number:15H03720  2015.4 - 2018.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    SUETSUGU Daisuke, SUGIOKA Hiroko, ITO Aki, ISSE Takehi, BABA Kiyoshi, ICHIHARA Hiroshi, TADA Noriko, TANAKA Satoru, ISHIHARA Yasushi, OBAYASHI Masayuki, TONEGAWA Takashi, NAKANISHI Masao, MIURA Seiichi, UTADA Hisashi, SANO Takashi, Shen Yang, Harmon Nick

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    We performed seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau (OJP) region from 2014 to 2017. Preliminary results of data analyses indicate that the cold Pacific slab is stagnant at depths around 600 km beneath the OJP. Low-velocity anomalies surround the OJP at depths shallower than 400 km. It may suggest that a mantle upwelling from the bottom of the mantle transition zone or the core-mantle boundary ascends, makes its way around the stagnant Pacific slab, and reaches to the Earth’s surface around the OJP. Seismic attenuation indicates stronger attenuation in the mantle beneath regions surrounding the OJP than that beneath the OJP, supporting the hypothesis described above. In addition, we confirm that a thick Moho discontinuity (~40 km) and mid-crust discontinuity beneath the OJP.

  9. Study of pore fluid circulation in the uppermost part of the subducting plate and its influence on seismogenic zone of large thrust earthquakes

    Grant number:15H03715  2015.4 - 2018.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YAMANO Makoto, UYESHIMA Makoto, TAKEI Yasuko, ICHIHARA Hiroshi, KODAIRA Shuichi, GOTO Shusaku

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    We revealed that heat flow significantly varies at a scale of 3 to 5 km on the incoming Pacific plate seaward of the Japan Trench. The short-wavelength heat flow variation can be attributed to heterogeneity in development of fractures and fluid circulation in oceanic crust due to bending of the plate near the trench. We also estimated the electrical resistivity structure seaward of the Japan Trench using electromagnetic survey data and could obtain information on water distribution in the upper part of the Pacific plate and its variation toward the trench.

  10. 日本周辺でのアレイ電磁気観測(JEMINI計画)のための基礎的研究

    2014 - 2016

    科学研究費補助金  基盤研究(B)

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    Authorship:Coinvestigator(s) 

  11. 海沈み込むプレートにおける含水・脱水プロセス~海底電磁気観測からのアプローチ~

    2012 - 2013

    科学研究費補助金  新学術領域研究

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    Authorship:Principal investigator 

    新学術領域研究「地殻流体:その実態と沈み込み変動への役割」の公募研究課題

  12. 海底電磁気観測による沈み込み帯全域の流体分布の解明

    2010 - 2011

    科学研究費補助金  新学術領域研究

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    Authorship:Principal investigator 

    新学術領域研究「地殻流体:その実態と沈み込み変動への役割」の公募研究課題

  13. 物理探査・地質情報の統合解析による内陸地震発生帯の3次元イメージング

    2006 - 2007

    科学研究費補助金 

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    Authorship:Principal investigator 

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Teaching Experience (On-campus) 5

  1. 地球惑星科学セミナー I

    2020

  2. 地球惑星科学セミナー I

    2019

  3. 地球惑星物理学実験法及び実験Ⅰ

    2019

  4. 地球惑星物理学実験法及び実験Ⅰ

    2018

  5. 地球惑星科学セミナー I

    2018

Teaching Experience (Off-campus) 1

  1. 海洋理工学演習

    2017.4 - 2018.3 Kobe University)

 

Social Contribution 3

  1. 2020年度火山学会LOC(親子実験担当)

    Role(s):Presenter, Planner, Organizing member

    2020.10

  2. 地球電磁気・地球惑星圏学会アウトリーチ部会

    Role(s):Planner, Organizing member, Demonstrator

    2020.10

  3. 地震学夏の学校運営委員

    Role(s):Planner, Organizing member, Investigater

    2015.4 - 2015.9

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    Audience: College students, Graduate students, Teachers, Researchesrs

Media Coverage 1

  1. 東日本大震災で発生した津波が巨大化した原因となった場所を特定(文部科学省記者クラブ)

    2013.10

Academic Activities 2

  1. 地球電磁気・地球惑星圏学会将来構想検討WG

    Role(s):Planning, management, etc.

    2018

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    Type:Academic society, research group, etc. 

  2. 物理探査学会会誌編集委員 International contribution

    Role(s):Planning, management, etc., Peer review

    2013