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Earthquake cycle simulation in heterogeneous medium by XBIEM

Research Project

Project/Area Number 19K04009
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 InstitutionThe University of Tokyo

Principal Investigator

Kame Nobuki  東京大学, 地震研究所, 准教授 (90304724)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords地震サイクルシミュレーション / 境界積分方程式法 / 不均質構造 / 断層 / XBIEM / 構造不均質 / 地震 / 破壊 / 震源物理学
Outline of Research at the Start

本研究は、高度化する観測研究から投げかけられた地震発生機構の根源的な問い「構造不均質と地震発生の因果関係」に対して、世界に先駆けて、地震の断層破壊の理論的研究(破壊力学に基づき亀裂の進展・停止を定量的に解析する)の立場から答えることを目的とする。本研究では、XBIEMを「不均質媒質中の地震サイクルシミュレーション: XBIEM-based Earthquake Cycle Simulation = XBIEM-ECS」へ展開する。構造不均質が引き起こす「非一様な歪み蓄積」からその結果生じる「地震の動的破壊」までの地震発生サイクル全体を模擬し、構造不均質に起因する地震破壊機構を抽出する。

Outline of Final Research Achievements

To investigate the effect of structural heterogeneity, which is characteristic of subduction zones called accretionary structures, on the stress loading process of earthquake occurrence, a simplified "triangular accretionary zone model" is considered and a numerical code is developed to calculate elastic deformation using the extended boundary integral equation method (XBIEM). Backslip was applied in the sticking zone and the stiffness contrast between the upper accretionary zone and the lower plate was systematically varied to numerically analyze the distribution of backslip in the upper and lower plates, the magnitude of submarine crustal deformation, and quantitative changes in the plate boundary stress loadings. The results show that the stress field decreases in shear stress without changing the spatial distribution, and that the presence of low-stiffness accretionary zone structures lowers the stress loading rate of the seismic cycle.

Academic Significance and Societal Importance of the Research Achievements

高度化する地震観測研究は、地下の「構造不均質」と「断層形状」ついて明かにしつつあるが、「地震発生前の応力場」の直接測定は未だ困難な問題として残る。本研究では、地震発生の理論的研究から応力場のヒントを探る。すなわち、構造不均質を含む地震発生サイクルモデルを用いて、構造不均質に起因する応力場が地震の動的破壊を規定し得るか調べた。本研究が更に発展し、地震開始/停止の位置と構造不均質との関係が理論的に示されたならはば、強震動予測における想定シナリオ地震の断層モデルパラメタ (現在、不確定性が非常に大きい) に強い拘束を与えることができる。より正確な予測は地震減災と直接結びつき、社会への影響も大きい。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (13 results)

All 2022 2021 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (9 results)

  • [Journal Article] Determination of the source parameters of the 2011 Tohoku-Oki earthquake from three-component pre-P gravity signals recorded by dense arrays in Japan2021

    • Author(s)
      Kimura Masaya、Kame Nobuki、Watada Shingo、Araya Akito、Kunugi Takashi、Wang Rongjiang
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1 Pages: 223-223

    • DOI

      10.1186/s40623-021-01553-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Pre-P gravity signals from dynamic earthquake rupture: modelling and observations2021

    • Author(s)
      Nobuki Kame
    • Journal Title

      Philosophical Transactions of the Royal Society A

      Volume: 379 Issue: 2196 Pages: 1-13

    • DOI

      10.1098/rsta.2020.0136

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nucleation of Characteristic Earthquakes in Simulated Cycles Involving Deep Huge Slow Slip Events2019

    • Author(s)
      Ohtani Makiko、Kame Nobuki、Nakatani Masao
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 124 Issue: 2 Pages: 1822-1837

    • DOI

      10.1029/2018jb016156

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Reply to comment by Vallee et al. on “Earthquake-induced prompt gravity signals identified in dense array data in Japan”2019

    • Author(s)
      Kimura Masaya、Kame Nobuki、Watada Shingo、Ohtani Makiko、Araya Akito、Imanishi Yuichi、Ando Masaki、Kunugi Takashi
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1 Pages: 1-8

    • DOI

      10.1186/s40623-019-1099-2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 豊後 SSEの断層摩擦特性・すべり推定の4 DVAR数値実験2022

    • Author(s)
      大谷真紀子, 亀伸樹, 加納将行
    • Organizer
      日本地震学会秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 地震で即時に生じる重力場変動の弾性歪み計測による検出可能性2022

    • Author(s)
      河合貫太郎, 亀伸樹, 綿田辰吾, 新谷昌人
    • Organizer
      日本地震学会秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Determination of source parameters of the 2011 Tohoku-Oki earthquake from three-component pre-P gravity signals recorded by dense arrays in Japan2021

    • Author(s)
      Nobuki Kame, Masaya Kimura, Shingo Watada, Akito Araya, Takashi Kunugi, Rongjiang Wang
    • Organizer
      2021 JPGU
    • Related Report
      2021 Research-status Report
  • [Presentation] P波前地震重力信号に現れる地震波形と異なる見かけの震源励起依存性2021

    • Author(s)
      河合貫太郎・亀伸樹
    • Organizer
      日本地震学会2020秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 構造不均質中の2次元地震サイクルシミュレーションで必要となる静的XBIEM核関数の全導出2020

    • Author(s)
      大竹和機・亀伸樹・大谷真紀子
    • Organizer
      日本地震学会2020秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 表現定理とグリーン関数 (3) ― 全無限グリーン関数の2階微分を用いた点震源が引き起こす歪み・応力・密度摂動場の表現 ―2019

    • Author(s)
      木村 将也・亀 伸樹
    • Organizer
      JpGU2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 津波のグリーン関数Kajiura Filterの級数表現の導出2019

    • Author(s)
      亀 伸樹・日下部 哲也・綿田 辰吾
    • Organizer
      JpGU2019
    • Related Report
      2019 Research-status Report
  • [Presentation] Detection of Earthquake-induced Prompt Gravity Signals in Multi-channel Data2019

    • Author(s)
      木村将也・亀伸樹・綿田辰吾・大谷真紀子・新谷昌人・今西 祐一・安東正樹・功刀 卓
    • Organizer
      JpGU2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 即時に生じた重力摂動に対する弾性体の過渡的応答の根源的性質:「総内力ゼロ」となる不思議な弾性変形様式とその物理機構2019

    • Author(s)
      亀 伸樹・木村 将也
    • Organizer
      日本地震学会2019秋季大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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