• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Evaluation of earthquake rupture process at the Nankai Trough by integrated method of fault material analysis and numerical simulation

Research Project

Project/Area Number 19K04039
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 InstitutionOsaka University

Principal Investigator

Hirono Tetsuro  大阪大学, 理学研究科, 准教授 (70371713)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords南海トラフ地震 / 動力学 / 断層 / 動力学解析 / プレート境界断層 / 断層ガウジ / 摩擦実験
Outline of Research at the Start

プレート境界断層の海溝付近での大規模滑りの発生メカニズム解明とその定量的評価を目的とし,南海トラフ地震発生帯掘削で採取された断層試料の鉱物組成・各種物性を計測,地震時における断層での摩擦発熱-熱拡散方程式とエネルギー保存則および反応速度式等を連立させた断層滑り弱化の数値解析と動力学破壊伝播シミュレーションを実施し,来たる南海トラフ地震で起こりえる海溝付近の断層滑りの時空間発展の定量的評価を行う.さらに,断層の物性情報が,断層滑り弱化と最終滑り量に与える影響を精査し,断層物質科学と破壊伝播過程の普遍的な関連性の解明を目指す.

Outline of Final Research Achievements

Dynamic rupture simulations using reported friction datasets measured in fault rocks on the Nankai Trough, that was ruptured during the 1944 Mw8.0 Tonankai earthquake, were performed. A steady-state friction triggered large slip (about 30 m) near the trench, whereas a high friction suppressed the rupture. The environmental condition in which the pore-fluid pressure was nearly equal to the lithostatic stress decreased the slip about 25 m in case of low friction. However, in case of high friction with negative stress drop, the slip reached about 20 m because the low shear strength did not arrest the inertial motion of rupture propagation. Such differences in fault-rock properties and fluid conditions may fundamentally influence on the complexity and the variability of rupture propagation along the Nankai trough.

Academic Significance and Societal Importance of the Research Achievements

来たる南海トラフ地震での破壊伝播過程の事前把握のため、地震時における海溝底付近のプレート境界断層の滑り量の定量的評価が重要である。統合国際深海掘削計画で採取された断層試料の分析と実測値を用いた動力学シミュレーションの結果、海溝付近の滑り量は断層の摩擦係数と初期の間隙水圧の状態に依存し、かつ、それらの僅かな差によって大きく変化することが明らかになった。これは、南海トラフ全体の地震時の滑り量の事前評価には、海溝に並行な方向での断層の物質科学特徴の評価が不可欠であることを示唆する。

Report

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

    (26 results)

All 2021 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (19 results) (of which Int'l Joint Research: 9 results) Remarks (3 results)

  • [Journal Article] Generation of sintered fault rock and its implications for earthquake energetics and fault healing2020

    • Author(s)
      Tetsuro Hirono, Shunya Kaneki, Tsuyoshi Ishikawa, Jun Kameda, Naoya Tonoike, Akihiro Ito, Yuji Miyazaki
    • Journal Title

      Communications Earth & Environment

      Volume: 1 Issue: 1

    • DOI

      10.1038/s43247-020-0004-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mechanical amorphization of synthetic fault gouges during rotary‐shear friction experiments at subseismic to seismic slip velocities2020

    • Author(s)
      Shunya Kaneki, Kiyokazu Oohashi, Tetsuro Hirono, Hiroyuki Noda
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125 Issue: 10 Pages: 1-28

    • DOI

      10.1029/2020jb019956

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Role of weak materials in earthquake rupture dynamics2019

    • Author(s)
      Hirono, T., Tsuda, K., and Kaneki, S.
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 6604-6604

    • DOI

      10.1038/s41598-019-43118-5

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] iagenetic and shear-induced transitions of frictional strength of carbon-bearing faults and their implications for earthquake rupture dynamics in subduction zones2019

    • Author(s)
      Kaneki, S., and Hirono, T.
    • Journal Title

      Scientific Reports

      Volume: 6 Issue: 1 Pages: 7884-7884

    • DOI

      10.1038/s41598-019-44307-y

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Experimental and numerical demonstrations for development of composite planar fabrics in fault zones2021

    • Author(s)
      Takeshi Miyamoto, Tetsuro Hirono, Akari Fuke, Kiyokazu Oohashi, and Satoshi Yukawa
    • Organizer
      EGU General Assembly 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Geochemical approach to evaluate slip behavior of an ancient plate boundary fault in the Shimanto accretionary complex, Japan2021

    • Author(s)
      Ayana Shimamoto, Tetsuro Hirono, and Tsuyoshi Ishikawa
    • Organizer
      OGS2021 VIRTUAL 18th annual meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 摩擦実験と数値計算による断層複合面構造の発達過程の物理的描像の解明2021

    • Author(s)
      宮本 英,廣野 哲朗,福家 朱莉,湯川 諭
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 回転式せん断摩擦試験機を用いた砂岩の摩擦挙動の解明2021

    • Author(s)
      矢野 弘道, 宮本 英, 廣野 哲朗
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 四万十帯日高川層群美山累層における太古のプレート境界断層の滑り痕跡:有機地球化学 -地球化学的分析によるアプローチ2021

    • Author(s)
      嶋本朱那,廣野哲朗,石川剛志,小川丈
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 含水条件における炭質物の熱熟成反応の実験的評価:地震時の断層摩擦発熱の指標として2021

    • Author(s)
      岩垣恵太、廣野哲朗
    • Organizer
      日本地球惑星科学連合大会2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 様々なスケールで断層に発達する複合面構造とその物理的描像2021

    • Author(s)
      宮本 英,廣野 哲朗,湯川 諭
    • Organizer
      日本活断層学会2021年度秋季学術大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 断層摩擦発熱の指標としての炭質物の熱熟成反応の含水条件下での実験的評価2021

    • Author(s)
      岩垣恵太,廣野哲
    • Organizer
      日本地震学会2021年度秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Thermal maturation of carbonaceous material as a proxy for earthquake slip: Evaluation of effects by initial maturity, heating rate, and mechanochemical activation2020

    • Author(s)
      Shuhei Yamashita and Tetsuro Hirono
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Experimental investigation of cumulative effect on thermal maturation of carbonaceous material by repeated earthquakes2020

    • Author(s)
      Yutaro Shimamoto, Tetsuro Hirono, and Hideki Mukoyoshi
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Evaluation of reactivity under hydrous condition on thermal maturity of carbonaceous materials as a proxy of seismic slip2020

    • Author(s)
      Keita Iwagaki and Tetsuro Hirono
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Determination of frictional characteristics and evaluation of strong motion by dynamic rupture simulations of the Kamishiro fault at the 2014 Northern Nagano earthquake2020

    • Author(s)
      Tadashi Miyamoto, Kenichi Tsuda, and Tetsuro Hirono
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 断層摩擦発熱指標としての炭質物の熱熟成反応1:速度論的影響の実験的評価2020

    • Author(s)
      山下修平、廣野哲朗
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 断層摩擦発熱指標としての炭質物の熱熟成反応3:繰り返し地震イベントの影響の実験的評価2020

    • Author(s)
      島村優太郎、廣野哲朗
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 断層摩擦発熱指標としての炭質物の熱熟成反応2:含水状態での反応性の実験的評価評価2020

    • Author(s)
      岩垣恵太、廣野哲朗
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 実験と数値計算を組み合わせた断層における複合面構造の発達過程の解明2020

    • Author(s)
      宮本英,大橋聖和,福家朱莉,廣野哲朗
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Tectono-geochemical characteristics of faults in the shallow portion of an accretionary prism2019

    • Author(s)
      Hirono, T.
    • Organizer
      Goldschmidt Conference 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical simulations of tsunamis at hypothetical megathrust earthquakes2019

    • Author(s)
      Osada, S., Hirono, T., Yoshioka, S., and Baba, T.
    • Organizer
      International Symposium Crustal Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Low- to high-velocity frictional properties and microstructure evolution of volcaniclastic sediments2019

    • Author(s)
      Fuke, A., Hirono, T., and Kaneki, S.
    • Organizer
      International Symposium Crustal Dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 地震時に断層でセラミックスが作られる!?

    • URL

      https://resou.osaka-u.ac.jp/ja/research/2020/20200817_1

    • Related Report
      2020 Research-status Report
  • [Remarks] 断層の動力学解析により東北地方太平洋沖地震でプレート境界が大規模に滑った原因を特定

    • URL

      https://resou.osaka-u.ac.jp/ja/research/2019/20190429_1

    • Related Report
      2019 Research-status Report
  • [Remarks] 断層に含まれる有機物が地震発生メカニズムに影響している!?

    • URL

      https://resou.osaka-u.ac.jp/ja/research/2019/20190527_1

    • Related Report
      2019 Research-status Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi