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

Research Project

Project/Area Number 16K17793
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionNagoya University (2017-2019)
Kobe University (2016)

Principal Investigator

Ichihara Hiroshi  名古屋大学, 環境学研究科, 助教 (90553074)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords海陸統合解析 / Magnetotelluric / 比抵抗構造 / 巨大地震発生帯 / 沈み込み帯 / OBEM / スロー地震 / 日向灘 / magnetotelluric / 南海トラフ / 海底電磁気 / 海溝型地震 / 地震 / 間隙流体 / 電気伝導度構造 / 海陸統合 / 海底電磁場観測 / 海陸統合探査 / magnetotelluric法 / 三次元比抵抗構造
Outline of Final Research Achievements

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.

Academic Significance and Societal Importance of the Research Achievements

本研究は複雑な海底地形を示す領域でも三次元比抵抗構造解析が可能であることを示した世界初の例であり、今後は世界の沈み込み帯において比抵抗構造の解明が進むことが期待される。特に、本研究で観測点を設置した南海トラフ西端部に位置する日向灘―高知県西方沖は、近年スロー地震が発生する地域として注目されており、さまざまなプロジェクトにより観測が進行中である。本研究による検討がこれらの研究に活用されると同時に、取得したデータについても活用可能であることから、今後は南海トラフ西端部において比抵抗構造、さらには流体分布の解明がこれまでにない精度で解明されることが期待される。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 2016

All Journal Article (1 results) (of which Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 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2018

    • Author(s)
      市原寛,多田訓子
    • Journal Title

      2018年 Conductivity Anomaly研究会論文集

      Volume: - Pages: 102-104

    • Related Report
      2017 Research-status Report
    • Open Access
  • [Presentation] Marine electromagnetic observations around a slow earthquake region in the western Nankai trough2019

    • Author(s)
      市原寛, 後藤忠徳, 松野哲男, 多田 訓子, 佐藤 真也
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Three-Dimensional Resistivity Modeling Incorporating Topography for Appropriate Mesh Designs in Land and Marine Magnetotelluric Inversions2018

    • Author(s)
      Hiroshi ICHIHARA, Noriko TADA, Toru MOGI
    • Organizer
      AOGS 15th Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 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2018

    • Author(s)
      市原寛,多田訓子
    • Organizer
      平成29年度 Conductivity Anomaly 研究会 (SGEPSS分科会)
    • Related Report
      2017 Research-status Report
  • [Presentation] 北海道北部の地震発生境界域における三次元比抵抗構造解析2016

    • Author(s)
      市原 寛, 茂木 透, 内田 利弘, 山谷 祐介, 多田 訓子
    • Organizer
      第140回 地球電磁気・地球惑星圏学会 総会・講演会
    • Place of Presentation
      福岡市
    • Year and Date
      2016-11-23
    • Related Report
      2016 Research-status Report
  • [Presentation] Fluid distribtuion and its contribution to inland earthquakes in the Hidaka collision zone, Northern Japan bsed on magnetotelluric measurements2016

    • Author(s)
      Hiroshi Ichihara, Toru Mogi
    • Organizer
      International Symposium Crustal Dynamics 2016: Unified Understanding of Geodynamic Processes at Different Time and Length Scales
    • Place of Presentation
      高山市
    • Year and Date
      2016-07-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2021-02-19  

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