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

• Project/Area Number: 15K05262
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: BABA Kiyoshi 東京大学, 地震研究所, 准教授 (70371721)
• Co-Investigator(Kenkyū-buntansha): 小山 崇夫 東京大学, 地震研究所, 助教 (00359192)
• Research Collaborator: FUJII Ikuko ; FUJITA Shigeru ; MATSUNO Tetsuo
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2017: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
• Keywords: マントル遷移層 / 電気伝導度 / 西太平洋 / 海底電磁気観測 / 水

Outline of Final Research Achievements

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.

Academic Significance and Societal Importance of the Research Achievements

沈み込む海洋プレートが地球表層からマントル深部への水輸送を担っているのは間違いなく、沈み込まれた側のマントル遷移層にはより多くの水が分布していることが予想される。本研究は、それを観測データから立証しようとするもので、固体地球科学分野における学術的意義は大きい。このような取組の蓄積により、地球の成り立ちと進化についての理解が深まり、一般社会への知の還元とつながる。

Research Products

• [Journal Article] The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau (2018)
  • Author(s): Suetsugu, D., H. Shiobara, H. Sugioka, N. Tada, A. Ito, T. Isse, K. Baba, H. Ichihara, T. Ohta, Y. Ishihara, S. Tanaka, M. Obayashi, T. Tonegawa, J. Yoshimitsu, T. Kobayashi, H. Utada
  • Journal Title: JAMSTEC Report of Research and Development Volume: 26 Issue: 0 Pages: 54-64
  • DOI: 10.5918/jamstecr.26.54
  • NAID: 130006725610
  • ISSN: 1880-1153, 2186-358X
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hot upper mantle beneath the Tristan da Cunha Hotspot, from probabilistic Rayleigh-wave inversion and petrological modeling (2018)
  • Author(s): Bonadio, R., W. H. Geissler, S. Lebedev, J. Fullea, M. Ravenna, N. L. Celli, W. Jokat, M. Jegen, C. Sens-Schoenfelder, K. Baba
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 印刷中 Issue: 5 Pages: 1412-1428
  • DOI: 10.1002/2017gc007347
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electrical conductivity of the oceanic asthenosphere and its interpretation based on laboratory measurements (2017)
  • Author(s): Katsura, T., K. Baba, T. Yoshino, and T. Kogiso
  • Journal Title: Tectonophysics Volume: 717 Pages: 162-181
  • DOI: 10.1016/j.tecto.2017.07.001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 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 (2017)
  • Author(s): Baba, K., N. Tada, T. Matsuno, P. Liang, R. Li, L. Zhang, H. Shimizu, N. Abe, N. Hirano, M. Ichiki, and H. Utada
  • Journal Title: Earth, Planets and Space Volume: 69
  • NAID: 120006358589
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Seismicity controlled by resistivity structure: the 2016 Kumamoto earthquakes, Kyushu Island, Japan (2017)
  • Author(s): Aizawa K. et al.
  • Journal Title: Earth, Planets and Space Volume: 69 Issue: 1 Pages: 4-4
  • DOI: 10.1186/s40623-016-0590-2
  • NAID: 120006360155
  • Peer Reviewed / Open Access
• [Journal Article] Unmanned observations in an area in danger of volcanic eruptions by using an UAV at Kuchinoerabu-jima volcano, southern Kyushu, Japan (2017)
  • Author(s): Ohminato, T., T. Kaneko, T. Koyama, A. Watanabe, W. Kanda, T. Tameguri, and R. Kazahaya
  • Journal Title: Journal of Natural Disaster Science Volume: 38 Pages: 85-104
  • Peer Reviewed / Open Access
• [Journal Article] Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic thickness, and water content (2017)
  • Author(s): Matsuno, T., D. Suetsugu, K. Baba, N. Tada, H. Shimizu, H. Shiobara, T. Isse, H. Sugioka, A. Ito, M. Obayashi, and H. Utada
  • Journal Title: Earth Planetary Science Letters Volume: 462 Pages: 189-198
  • DOI: 10.1016/j.epsl.2016.12.045
  • Peer Reviewed
• [Journal Article] Marine magnetotellurics imaged no distinct plume beneath the Tristan da Cunha hotspot in the southern Atlantic Ocean (2017)
  • Author(s): Baba, K., J. Chen, M. Sommer, H. Utada, W. H. Geissler, W. Jokat, and M. Jegen
  • Journal Title: Tectonophysics Volume: 印刷中 Pages: 52-63
  • DOI: 10.1016/j.tecto.2016.09.033
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electromagnetic evidence for volatile-rich upwelling beneath the Society hotspot, French Polynesia (2016)
  • Author(s): N. Tada, P. Tarits, K. Baba, H. Utada, T. Kasaya, D. Suetsugu
  • Journal Title: Geophysical Research Letters Volume: 43 Issue: 23 Pages: 12012-12026
  • DOI: 10.1002/2016gl071331
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Three-dimensional resistivity structure of Asama Volcano revealed by data-space magnetotelluric inversion using unstructured tetrahedral elements (2016)
  • Author(s): Usui Y., Y. Ogawa, K. Aizawa, W. Kanda, T. Hashimoto, T. Koyama, Y. Yamaya, and T. Kagiyama
  • Journal Title: Geophysical Journal International Volume: 208 Issue: 3 Pages: 1359-1372
  • DOI: 10.1093/gji/ggw459
  • NAID: 120006582592
  • Peer Reviewed / Open Access
• [Journal Article] Electrical image of subduction zone beneath northeastern Japan (2015)
  • Author(s): Ichiki, M., Y. Ogawa, T. Kaida, T. Koyama, M. Uyeshima, T. Demachi, S. Hirahara, Y. Honkura, W. Kanda, T. Kono, M. Matsushima, T. Nakayama, S. Suzuki, and H. Toh
  • Journal Title: Journal of Geophysical Research Volume: 120 Issue: 12 Pages: 7937-7965
  • DOI: 10.1002/2015jb012028
  • Peer Reviewed / Open Access
• [Presentation] On separation of Sq field and EM response estimation using seafloor array data (2018)
  • Author(s): Baba, K.
  • Organizer: 24th Electromagnetic Induction Workshop
  • Int'l Joint Research
• [Presentation] Estimation of electrical conductivity structure of the mantle by using Sq source model of GAIA (2018)
  • Author(s): Koyama, T., Y. Murata, S. Fujita, I. Fujii, K. Baba, Y. Miyoshi, H. Fujiwara, H. Jin, and H. Shinagawa
  • Organizer: 24th Electromagnetic Induction Workshop
  • Int'l Joint Research
• [Presentation] The initial report of the electromagnetic observation on the seafloor in the Ontong Java Plateau (2018)
  • Author(s): Tada, N., K. Baba, H. Ichihara, T. Ota, T. Kobayashi, H. Utada, and D. Suetsugu
  • Organizer: JpGU meeting 2018
  • Int'l Joint Research
• [Presentation] The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau (2018)
  • Author(s): Suetsugu, D., H. Shiobara, H. Sugioka, N. Tada, A. Ito, T. Isse, K. Baba, H. Ichihara, T. Ota, Y. Ishihara, S. Tanaka, M. Obayashi, T. Tonegawa, J. Yoshimitsu, T. Kobayashi, and H. Utada
  • Organizer: JpGU meeting 2018
  • Int'l Joint Research
• [Presentation] Marine magnetotelluric data supports melt at the LAB as the origin of the petit-spot in the northwestern Pacific (2018)
  • Author(s): Baba, K., N. Abe, N. Hirano, and M. Ichiki
  • Organizer: JpGU meeting 2018
  • Int'l Joint Research
• [Presentation] Electrical feature supports the melt in the lithosphere-asthenosphere boundary as the origin of the petit-spot in northwestern Pacific (2018)
  • Author(s): Baba, K., N. Abe, N. Hirano, and M. Ichiki
  • Organizer: EGU General Assembly 2018
  • Int'l Joint Research
• [Presentation] 周期帯10^4～10^5秒のMTレスポンス推定について (2018)
  • Author(s): 馬場聖至
  • Organizer: 第144回地球電磁気・地球惑星圏学会講演会
• [Presentation] GAIA Sqモデルを用いたマントル電気伝導度構造の推定 (2018)
  • Author(s): 小山崇夫, 村田友香, 藤田茂, 藤井郁子, 馬場聖至, 三好勉信, 藤原均, 陣英克, 品川裕之
  • Organizer: 第144回地球電磁気・地球惑星圏学会講演会
• [Presentation] Lateral heterogeneity of nominally ‘normal’ oceanic upper mantle in the northwestern Pacific (2018)
  • Author(s): 多田訓子, 馬場聖至, 歌田久司
  • Organizer: 第144回地球電磁気・地球惑星圏学会講演会
• [Presentation] 海底MTアレイデータと独立成分分析を用いたSq成分分離とMTレスポンス推定の試み (2018)
  • Author(s): 馬場聖至
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Simple plate cooling model is no longer applicable to the upper mantle beneath the northwestern Pacific: Evidence from marine magnetotellurics (2017)
  • Author(s): Baba, K., N. Tada, T. Matsuno, P. Liang, R. Li, L. Zhang, H. Shimizu, N. Abe, N. Hirano, M. Ichiki, and H. Utada
  • Organizer: JpGU-AGU joint meeting 2017
  • Int'l Joint Research
• [Presentation] A three-dimensional electrical conductivity image of the mantle plume of the Society hotspot in French Polynesia (2017)
  • Author(s): Tada, N., P. Tarits, K. Baba, H. Utada, T. Kasaya, and D. Suetsug
  • Organizer: IAG-IASPEI Joint Scientific Assembly 2017
  • Int'l Joint Research
• [Presentation] Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic thickness, and water content (2017)
  • Author(s): Matsuno, T., D. Suetsugu, K. Baba, N. Tada, H. Shimizu, H. Shiobara, T. Isse, H. Sugioka, A. Ito, M. Obayashi, and H. Utada
  • Organizer: IAG-IASPEI Joint Scientific Assembly 2017
  • Int'l Joint Research
• [Presentation] Structure of the lithosphere-asthenosphere system in the vicinity of the Tristan da Cunha hot spot as seen by surface waves (2017)
  • Author(s): Bonadio R., W. H. Geissler, M. Ravenna, S. Lebedev, N. L. Celli, W. Jokat, M. Jegen, C. Sens-Schoenfelder, and K. Baba
  • Organizer: EGU General Assembly 2017
  • Int'l Joint Research
• [Presentation] Towards electrical resistivity imaging around outer-rise bending normal faults off the Japan trench (2017)
  • Author(s): Ichihara, H., T. Kasaya, T. Goto, K. Baba, and M. Yamano
  • Organizer: JpGU-AGU Joint meeting 2017
  • Int'l Joint Research
• [Presentation] Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data (2017)
  • Author(s): Matsuno, T., K. Baba, and H. Utada
  • Organizer: JpGU-AGU Joint meeting 2017
  • Int'l Joint Research
• [Presentation] Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data (2017)
  • Author(s): Matsuno, T., K. Baba, and H. Utada
  • Organizer: IAG-IASPEI Joint Scientific Assembly 201
  • Int'l Joint Research
• [Presentation] Synthetic modeling of global induction by the GAIA Sq source model (2017)
  • Author(s): Koyama, T., Y. Murata, S. Fujita, I. Fujii, K. Baba, Y. Miyoshi, H. Fujiwara, H. Jin, H. Shinagawa
  • Organizer: IAPSO-IAMAS-IAGA Joint Assembly 2017
  • Int'l Joint Research
• [Presentation] Asthenospheric temperature and lithospheric thickness beneath the Tristan da Cunha hotspot from probablilistic inversion of surface-wave dispersion data and petrological modeling (2017)
  • Author(s): Bonadio, R., W. H. Geissler, S. Lebedev, M. Ravenna, J. Fullea, N. L. Celli, W. Jokat, M. Jegen, C. Sens-Schoenfelder, and K. Baba
  • Organizer: AGU 2017 fall meeting
  • Int'l Joint Research
• [Presentation] Electrical feature at the depth of lithosphere-asthenosphere boundary beneath the petit-spot volcanic field in northwestern Pacific, (2017)
  • Author(s): Baba, K., N. Abe, N. Hirano, and M. Ichiki
  • Organizer: AGU 2017 fall meeting
  • Int'l Joint Research
• [Presentation] Sensitivity analysis of high conductivity anomalies in the upper mantle beneath the Society hotspot (2017)
  • Author(s): 多田訓子, P. Tarits, 馬場聖至, 歌田久司, 末次大輔
  • Organizer: 日本地球惑星科学連合2017年大会
• [Presentation] Estimation of the seafloor electromagnetic responses in the mixed excitation band by using Sompi Spectral Analysis (2017)
  • Author(s): Li, R., 清水久芳, 馬場聖至, 歌田久司
  • Organizer: 日本地球惑星科学連合2017年大会
• [Presentation] GAIA Sqソースモデルによるグローバル電磁誘導計算とマントル電気伝導度構造推定への応用 (2017)
  • Author(s): 小山崇夫, 村田友香, 藤田茂, 藤井郁子, 馬場聖至, 三好勉信, 藤原均, 陣英克, 品川裕之
  • Organizer: 第142回地球電磁気・地球惑星圏学会講演会
• [Presentation] 海底MTアレイデータと独立成分分析を用いたSq成分分離の試み (2017)
  • Author(s): 馬場聖至
  • Organizer: 第142回地球電磁気・地球惑星圏学会講演会
• [Presentation] 高次モードの外部磁場ソースに対する3次元不均質球体電磁誘導モデリング (2016)
  • Author(s): 小山崇夫, 清水久芳
  • Organizer: 第140回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 九州大学（福岡県・福岡市）
  • Year and Date: 2016-11-19
• [Presentation] Marine magnetotellurics imaged no plume beneath the Tristan da Cunha hotspot in the southern Atlantic Ocean (2016)
  • Author(s): Baba, K., J. Chen, M. Sommer, H. Utada, W. Geissler, W. Jokat, and M. Jegen
  • Organizer: 23rd Electromagnetic Induction Workshop
  • Place of Presentation: Chiang Mai, Thailand
  • Year and Date: 2016-08-14
  • Int'l Joint Research
• [Presentation] Mantle transition zone beneath a normal seafloor in the northwestern Pacific: electrical conductivity, seismic thickness, and water content (2016)
  • Author(s): Matsuno, T., D. Suetsugu, H. Utada, K. Baba, N. Tada, H. Shimizu, H. Shiobara, T. Isse, H. Sugioka, A. Ito, and M. Obayashi
  • Organizer: 23rd Electromagnetic Induction Workshop
  • Place of Presentation: Chiang Mai, Thailand
  • Year and Date: 2016-08-14
  • Int'l Joint Research
• [Presentation] Estimating volatile content in oceanic upper mantle from magnetotelluric observations (2016)
  • Author(s): Baba, K
  • Organizer: Goldschmidt Conference 2016
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2016-06-26
  • Int'l Joint Research / Invited
• [Presentation] Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content (2016)
  • Author(s): Matsuno, T., D. Suetsugu, H. Utada, K. Baba, N. Tada, H. Shimizu, H. Shiobara, T. Isse, H. Sugioka, and A. Ito
  • Organizer: JpGU meeting 2016
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] Five years of the Normal Oceanic Mantle (NOMan) Project (2016)
  • Author(s): Utada, H., H. Kawakatsu, H. Shiobara, K. Baba, T. Isse, A. Takeo, and D. Suetsugu
  • Organizer: JpGU meeting 2016
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-22
  • Int'l Joint Research / Invited
• [Presentation] Possibility of anisotropic structure in electrical conductivity for the upper mantle beneath northwestern Pacific Ocean (2016)
  • Author(s): Baba, K., and H. Utada
  • Organizer: JpGU meeting 2016
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] 南大西洋トリスタン・ダ・クーニャホットスポットの下にはプルームがない：電気伝導度構造からの示唆 (2016)
  • Author(s): 馬場聖至, J. Chen, 歌田久司, M. Jegen
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-22
• [Presentation] Fast and memory saved 3-D forward modeling code by using the contracting integral equation (CIE) method (2016)
  • Author(s): T. Koyama
  • Organizer: Magnetotelluric 3D Inversion Workshop III
  • Place of Presentation: Bari, Italy
  • Year and Date: 2016-05-16
  • Int'l Joint Research
• [Presentation] Thermal and compositional constrains on the upper mantle beneath the northwestern Pacifc: imposed by marine magnetotelluircs (2016)
  • Author(s): Baba, K., N. Tada, T. Matsuno, H. Shimizu, L. Zhang, P. Liang, and H. Utada
  • Organizer: EGU General Assembly 2016
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2016-04-17
  • Int'l Joint Research
• [Presentation] Mantle transition zone beneath a normal seafloor in the northwestern Pacific: Electrical conductivity, seismic discontinuity, and water content (2016)
  • Author(s): Matsuno, T., D. Suetsugu, H. Utada, K. Baba, N. Tada, H. Shimizu, H. Shiobara, H. Sugioka, and A. Ito
  • Organizer: EGU General Assembly 2016
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2016-04-17
  • Int'l Joint Research
• [Presentation] Five years of the Normal Oceanic Mantle (NOMan) Project (2016)
  • Author(s): Utada, H, *H. Kawakatsu, H. Shiobara, K. Baba, T. Isse, D. Suetsugu, and NOMan Project team
  • Organizer: EGU General Assembly 2016
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2016-04-17
  • Int'l Joint Research
• [Presentation] GAIAモデルを利用したSqの再現とその応用 (2016)
  • Author(s): 藤田茂, 藤井郁子, 三好勉信, 陣英克, 小山崇夫, 馬場聖至, 松野哲男
  • Organizer: CA研究会
  • Place of Presentation: 東京大学地震研究所（東京都文京区）
  • Year and Date: 2016-01-06
• [Presentation] 北西太平洋のふつうの海洋マントル遷移層：電気伝導度、地震波不連続面、含水量 (2016)
  • Author(s): 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
  • Organizer: CA研究会
  • Place of Presentation: 東京大学地震研究所（東京都文京区）
  • Year and Date: 2016-01-06
• [Presentation] The amount of water reserved in a “normal” oceanic mantle transition zone beneath the northwestern Pacific, inferred from data of coincident ocean bottom electromagnetic and seismic observations (2015)
  • Author(s): Matsuno, T., D. Suetsugu, H. Utada, K. Baba, N. Tada, H. Shimizu, H. Shiobara, T. Isse, H. Sugioka, and A. Ito
  • Organizer: AGU 2015 fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Normal Oceanic Mantle (NOMan) project (2015)
  • Author(s): Baba, K., N. Tada, T. Matsuno, H. Shimizu, and H. Utada
  • Organizer: 26th Schmucker-Weidelt Kolloquium fuer Elektromagnetische Tiefenforschung
  • Place of Presentation: Dassel, Germany
  • Year and Date: 2015-09-21
  • Int'l Joint Research
• [Presentation] 「ふつう」の海洋マントルの電気伝導度構造イメージング (2015)
  • Author(s): 馬場聖至, 多田訓子, 松野哲男, 梁朋飛, 張羅磊, 清水久芳, 歌田久司
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2015-05-24
• [Presentation] 「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 (2015)
  • Author(s): 松野哲男, 歌田久司, 馬場聖至, 清水久芳, 多田訓子
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2015-05-24