Development of an advanced inversion code for obtaining 3-D electrical conductivity structures by combining Wideband and Network MT data

• Project/Area Number: 25400443
• 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: Uyeshima Makoto 東京大学, 地震研究所, 准教授 (70242154)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 電気伝導度構造 / ３次元 / インヴァージョン / コード開発 / 表層不均質の影響除去 / 位相テンソル / 磁場変換関数 / ネットワークMT / 比抵抗構造

Outline of Final Research Achievements

Electrical conductivity is one of the most important geophysical properties and especially sensitive to existence of subsurface water or melts. Non-uniqueness in scales of conductivity values and structural lengths, however, has long been debated in the previous studies to estimate the conductivity structure. For the purpose of reproducing structures with the true scales from the observation parameters, we tried to develop 3-D inversion schemes where only the observation parameters free from distortions due to existence of near-surface small-scale resistivity heterogeneity are used. We succeeded in coding a 3-D inversion by using only the phase tensor and the induction vectors which can be obtained from the wide-band MT survey. We applied the code to the real data obtained in the Iwaki area with significant earthquake swarm activities induced by the 2011 great Tohoku earthquake. By examining the results, we confirmed that the true scales were reproduced in the real data application.

Research Products

• [Int'l Joint Research] マヒドール大学(タイ)
• [Journal Article] Gas pathways and remotely triggered earthquakes beneath Mt. Fuji, Japan (2016)
  • Author(s): Aizawa K., Sumino H., Uyeshima M., Yamaya Y., Hase H., Takahashi M., Kazahaya K., Ohno M., Rung-Arunwan T. and Ogawa Y.
  • Journal Title: Geology Volume: 44 Issue: 2 Pages: 127-130
  • DOI: 10.1130/g37313.1
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Temperature and melt fraction distributions in a mantle wedge determined from the electrical conductivity structure: Application to one non-volcanic and two volcanic regions in the Kyushu subduction zone, Japan (2015)
  • Author(s): Hata, M. and Uyeshima, M.
  • Journal Title: Geophysical Research Letters Volume: 42 Issue: 8 Pages: 2709-2717
  • DOI: 10.1002/2015gl063308
  • Peer Reviewed
• [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
• [Journal Article] Three-dimensional electromagnetic imaging of upwelling fluids in the Kyushu subduction zone, Japan (2015)
  • Author(s): Hata, M., Oshiman, N., Yoshimura, R., Tanaka, Y. and Uyeshima, M.
  • Journal Title: JOURNAL OF GEOPHYSICAL RESEARCH : SOLID EARTH Volume: 120 Issue: 1 Pages: 1-17
  • DOI: 10.1002/2014jb011336
  • Peer Reviewed
• [Journal Article] Study on the conductivity structure of the upper mantle and transition zone beneath North China (2015)
  • Author(s): Xu, GJ., Tang, J., Huan QH and Uyeshima, M.
  • Journal Title: Chinise Journal of Geophysics Volume: 58 Pages: 566-575
  • Peer Reviewed / Open Access
• [Journal Article] A 3-D electrical resistivity model beneath the focal zone of the 2008 Iwate-Miyagi Nairiku earthquake(M 7.2) (2014)
  • Author(s): Ichihara, H., Sakanaka, S., Mishina, M., Uyeshima, M., Nishitani, T., Ogawa, Y., Yamaya, Y., Mogi, T., Amita, K. and Miura, T.
  • Journal Title: Earth, Planets and Space Volume: 66 Issue: 1 Pages: 50-50
  • DOI: 10.1186/1880-5981-66-50
  • Peer Reviewed
• [Journal Article] Three- dimensional resistivity structure and magma plumbing system of the Kirishima volcanoes as inferred from broad-band magnetotelluric data (2014)
  • Author(s): Aizawa, K., T.Koyama, H.Hase, M.Uyeshima, W.Kanda, M.Utsusgi, R.Yoshimura, Y.Yamaya, T.Hashimoto, K.Yamazaki, S.Komatsu, A.Watanabe, K.Miyakawa, Y.Ogawa
  • Journal Title: J. Geophys. Res. Volume: 119 Issue: 1 Pages: 198-215
  • DOI: 10.1002/2013jb010682
  • NAID: 120006582304
  • Peer Reviewed
• [Journal Article] Three-dimensional inversion of magnetotelluric phase tensor data (2013)
  • Author(s): Patro, P.K., Uyeshima, M. and Siripunvaraporn, W.
  • Journal Title: Geophysical Journal International Volume: 192 Issue: 1 Pages: 58-66
  • DOI: 10.1093/gji/ggs014
  • Peer Reviewed
• [Journal Article] Magnetotelluric and temperature monitoring after the 2011 sub-Plinian eruptions of Shinmoe-dake volcano (2013)
  • Author(s): Aizawa, K., Koyama, T., Uyeshima, M., Hase, H., Hashimoto, T., Kanda, W., Yoshimura, R., Utsugi, M., Ogawa, Y., Yamazaki, K.
  • Journal Title: Earth Planets Space Volume: 65 Issue: 6 Pages: 539-550
  • DOI: 10.5047/eps.2013.05.008
  • NAID: 10031193467
  • Peer Reviewed
• [Presentation] いわき誘発地震帯での３次元比抵抗イメージング (2015)
  • Author(s): 上嶋誠，小川康雄，市來雅啓
  • Organizer: 研究集会「内陸地震．なんで地震はそこで起こるか？」
  • Place of Presentation: 京都大学阿武山地震観測所（大阪府高槻市）
  • Year and Date: 2015-09-01
• [Presentation] Three-Dimensional Inversion of MT Phase Tensor Combined with Geomagnetic Transfer Function (2015)
  • Author(s): Uyeshima, M. and Siripunvaraporn, W.
  • Organizer: 12th AOGS Annual Meeting
  • Place of Presentation: シンガポール（シンガポール国）
  • Year and Date: 2015-08-04
  • Int'l Joint Research
• [Presentation] Development of 3-D inversion code using phase tensors and induction vectors and its application to the Iwaki source regions of normal faulting sequences (2015)
  • Author(s): Uyeshima, M., Ogawa, Y., Ichiki, M. and Siripunvaraporn, W.
  • Organizer: 26th IUGG GENERAL ASSEMBLY 2015
  • Place of Presentation: プラハ（チェコ国）
  • Year and Date: 2015-06-25
  • Int'l Joint Research
• [Presentation] いわき誘発地震帯での３次元比抵抗イメージング (2015)
  • Author(s): 上嶋誠，小川康雄，市來雅啓
  • Organizer: 日本地球惑星科学連合 2015年度連合大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2015-05-28
• [Presentation] Three-dimensional inversion of MT phase tensor combined with geomagnetic transfer function (2014)
  • Author(s): Uyeshima, M. and Siripunvaraporn, W.
  • Organizer: 22th EM Induction Workshop
  • Place of Presentation: ドイツ国ヴァイマール
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] PT and IV imaging of source regions of normal faulting sequences induced by the 2011 M9.0 Tohoku-Oki earthquake (2014)
  • Author(s): Uyeshima, M., Ogawa, Y. and Ichiki, M.
  • Organizer: 22th EM Induction Workshop
  • Place of Presentation: ドイツ国ヴァイマール
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Thermal Structure and Melt Fraction beneath Kyushu in the Southwest Japan Arc: Interpretation of the 3D Electrical Resistivity Model by Using Network-MT Data (2014)
  • Author(s): Hata, M., Uyeshima, M., Oshiman, N., Yoshimura, R. and Tanaka, Y.
  • Organizer: 22th EM Induction Workshop
  • Place of Presentation: ドイツ国ヴァイマール
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] 3D Electrical Resistivity Imaging by Geomagnetic Transfer Function Data based on the Structure Determined by Network-MT Data beneath Kyushu in the Southwest Japan Arc (2014)
  • Author(s): Hata, M., Uyeshima, M., Handa, S., Shimoizumi, M., Tanaka, Y., Takeshi Hashimoto, T., Kagiyama, T., Utada, H., Munekane, H., Ichiki, M., Fujita, K.
  • Organizer: 22th EM Induction Workshop
  • Place of Presentation: ドイツ国ヴァイマール
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] On elucidation of the regional anomalous phase contained in the Network-MT data in the Chubu district, central Japan
  • Author(s): Uyeshima, M., Yamaguchi, S., Murakami, H., Tanbo, T., Yoshimura, R., Ichihara, H. and Omura, K.
  • Organizer: 3DEM workshop
  • Place of Presentation: 札幌市（北海道大学）
• [Presentation] Network-MT法の紹介－広域深部電気伝導度構造解明を目指して－
  • Author(s): 上嶋誠
  • Organizer: 日本地球惑星科学連合大会2013
  • Place of Presentation: 千葉市（幕張メッセ）
  • Invited
• [Presentation] Upwelling Fluids interpreted by 3D Electrical Resistivity Structure beneath island-arc volcanoes in Kyushu, southern Japan
  • Author(s): Hata, M., Oshiman, N., Tanaka, Y. and Uyeshima, M.
  • Organizer: IAVCEI 2013
  • Place of Presentation: 鹿児島市（かごしま県民交流センター）
• [Presentation] 九州地方における磁場変換関数データのコンパイル：Network-MTデータと磁場変換関数データの統合解析に向けて
  • Author(s): 畑真紀, 上嶋誠, 下泉政志, 田中良和, 鍵山恒臣, 歌田 久司, 大志万 直人, 吉村 令慧, 市來 雅啓
  • Organizer: SGEPSS秋大会
  • Place of Presentation: 高知市（高知大学）