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Rupture initiation and stop under nonuniform stress and friction

Research Project

Project/Area Number 20K14583
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology (2021-2023)
National Research Institute for Earth Science and Disaster Prevention (2020)

Principal Investigator

Urata Yumi  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (80780452)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords断層 / 破壊開始 / 地震規模 / 非一様応力摩擦場 / 断層破壊 / 破壊の開始と停止 / 破壊開始停止 / 震源物理 / 破壊力学
Outline of Research at the Start

本研究では、断層破壊力学に基づき、空間非一様な応力・摩擦下における断層破壊の伝播条件を理論的に予測する。断層破壊の開始・停止・伝播方向に関し、理論予測を3次元動的破壊伝播の数値計算結果と比較することにより、理論予測の妥当性を評価する。そして、その理論予測を自然地震発生モデルに適用し、自然地震の予測可能性を明らかにするともに、想定南海トラフ地震について巨大地震発生の可能性を検討する。

Outline of Final Research Achievements

Theoretical works on rupture initiation have assumed the uniform or axisymmetric shear stress distribution and the uniform friction properties. However, stress and friction distributions are considered to be heterogeneous, and the heterogeneity would contribute to the stopping of ruptures. In this study, we showed that indices for the prediction of rupture initiation and the earthquake magnitude, based on the static fracture mechanics. We applied the indices to anticipated Nankai-trough earthquakes. These results would be useful in the study on the earthquake rupture scenarios.

Academic Significance and Societal Importance of the Research Achievements

本課題では、空間非一様な応力・摩擦下での断層破壊の開始と地震規模の予測に関する指標を得ることができた。これは、破壊の開始・停止の物理に関する基礎的な理解を深化させるものである。また、この指標は、今後、防災減災対策にも有用な、想定地震の震源位置や規模の予測に関する研究を進める上での基礎となりうる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (2 results)

All 2020

All Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Presentation] Earthquake magnitude estimation under nonuniform stress and friction2020

    • Author(s)
      Yumi Urata, Eiichi Fukuyama, and Chihiro Hashimoto
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 非一様応力・摩擦下における地震規模の予測2020

    • Author(s)
      浦田優美, 福山英一, 橋本千尋
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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