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Establishment of a new method for evaluating fault activity based on rotary shear experiments, microstructural observations, and chemical analyses

Research Project

Project/Area Number 18K13977
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 25030:Disaster prevention engineering-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Shimizu Mayuko  国立研究開発法人日本原子力研究開発機構, 核燃料・バックエンド研究開発部門 東濃地科学センター, 研究職 (10751191)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords活断層 / 摩擦試験 / EPMA / clay-clast aggregate / CCA / XRD / XGT
Outline of Final Research Achievements

The method for evaluating activity of a fault covered by no strata has not been established. The purpose of this study is to capture features such as mineralogical changes, chemical composition changes, and microstructural deformation that can be key to evaluating fault activity. We performed rotary shear experiments on simulated fault gouges and conducted microstructural observations and chemical analyses of the samples after the experiments. As a result, clay-clast aggregates (CCAs) were identified in the samples of several experiments, including the experiment using quartz and biotite as a simulated fault gouge. By focusing on the textures and chemical compositions of these structures, some physical and chemical changes that characterize seismic fault slip may be identified.

Academic Significance and Societal Importance of the Research Achievements

原子力関連施設の耐震安全性評価や、地層処分の安全評価の際に必要となる断層の活動性評価は、一般的には断層を被覆する年代既知の地層の変位に基づいて実施されるが、そのような地層がない場合(例えば、地下坑道掘削中に出現した断層など)はこの手法を適用することが難しい。このような場合の断層の活動性評価手法として、断層運動に伴い生じる破壊や化学反応が有効な指標となり得る。補助事業期間内には活動性評価の指標として決定的な特徴を捉えることはできなかったものの、確認された複数パターンのCCAを今後詳細に調べることにより、新しい活動性評価手法構築の端緒となるような特徴を見出すことができる可能性がある。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (1 results)

All 2018

All Presentation (1 results)

  • [Presentation] 高速摩擦試験により断層ガウジ模擬物質中に形成されたCCAの特徴2018

    • Author(s)
      清水麻由子, 大橋聖和, 丹羽正和
    • Organizer
      日本地質学会第125年学術大会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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