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Stress evaluation of earthquake fault and slow slip fault in subduction zone

Research Project

Project/Area Number 19K04019
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionYamaguchi University

Principal Investigator

Sakaguchi Arito  山口大学, 大学院創成科学研究科, 教授 (80304666)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords断層 / 歪み / 応力 / カルサイト / 震源断層 / スロー地震 / カルサイト双晶密度 / 歪 / 形成場 / 沈み込み帯
Outline of Research at the Start

沈み込み帯の地震挙動は温度によってコントロールされている.浅部スロー地震が150℃以下の温度で,大地震が150から350℃の間で,そして深部スロー地震が350℃以上の温度領域で発生する.陸上付加体で,それぞれの温度に相当する陸上付加体である房総地域,四国地域,九州地域の断層をカルサイト応力計で調査し,断層周囲の応力集中状態から,通常地震とスロー地震の断層を識別し比較する.そこからスロー地震発生機構の物質科学的理解を深める.

Outline of Final Research Achievements

It had been difficult to distinguish whether the fault caused a seismic rapid slip or a slow slip from the fault rock. We proposed that the slip mode can be identified from the stress concentration condition around the fault. For this subject, we improved the technique of the calcite twin analysis. It was found that strain distribution around the fault depends on the depth.
In the process of this study, we developed new technique to estimate stress/strain condition of rock and related materials. This method can apply to safety evaluation for concrete buildings.

Academic Significance and Societal Importance of the Research Achievements

地震発生帯が巨大地震やスロー地震といった複雑な挙動を起こすメカニズムを説明するうえで,研究対象となる陸上断層の過去の挙動を知る手段の開発は急務であった.本研究は新しい応力・歪み計を開発して,これに有効であることを示した.
また,同手法はコンクリート構造物にも応用できるため,経年劣化や災害によるダメージを受けた構造物の安全評価にも利用出来る(特許出願済み).

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (8 results)

All 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 1 results)

  • [Journal Article] Fluid source of seismogenic accretionary body based on calcite isotope ratio, Shimanto complex, Shikoku, southwest Japan2021

    • Author(s)
      Uchida Natsuki、Murayama Masafumi、Matsubara Yuki、Sakaguchi Arito
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 127 Issue: 12 Pages: 701-708

    • DOI

      10.5575/geosoc.2021.0031

    • NAID

      130008142581

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2021-12-15
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 沈み込み帯ルーフスラスト・OSTの破壊伝播:四万十帯牟岐メランジュ南阿波断層・水落断層の例2021

    • Author(s)
      曽川 裕、坂口 有人
    • Organizer
      日本地質学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 固結砂岩中における粒子溶解を伴う流体移動2021

    • Author(s)
      宮原 拓己、坂口 有人
    • Organizer
      日本地質学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 断層の浅部活動を特徴づける周辺歪み分布2021

    • Author(s)
      坂口 有人、吉松 寛奈
    • Organizer
      日本地質学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Comparison of paleostress and paleotemperature analysis at Roof Thrust and Out-of-Sequence Thrust of subduction zone : The Minami Awa Fault and Mizoochi Fault, The Mugi area in the Shimanto Belt2021

    • Author(s)
      Yu Sogawa, Arito Sakaguchi
    • Organizer
      Japan Geoscience Union meeting, 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Heterogeneous strain energy distribution as indicator for asperity in seismogenic fault2020

    • Author(s)
      Arito Sakaguchi, Kikka Takiguchi, Masato Ichiki
    • Organizer
      Japan Geoscience Union meeting, 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] セメントを主体とする複合材における応力・歪みの履歴推定方法およびカルサイト粒子集合体2020

    • Inventor(s)
      坂口有人・安藤航平
    • Industrial Property Rights Holder
      山口大学
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Acquisition Date
      2022
    • Related Report
      2021 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] セメントを主体とする複合材における応力・歪みの履歴推定方法2020

    • Inventor(s)
      坂口有人・安藤航平
    • Industrial Property Rights Holder
      山口大学
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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