2022 Fiscal Year Final Research Report
Numerical simulations of earthquake and SSE triggering by dynamic stress changes
| Project/Area Number |
18K03775
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Keywords | SSEのトリガー / 応力依存Nagata摩擦則 |
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| Outline of Final Research Achievements |
We performed numerical simulations of earthquake and SSE triggered by seismic waves. We assumed a revised Nagata frictional law which includes effects of normal stress changes. Shear or normal stress perturbations were applied to a circular asperity at some timing of earthquake cycle, earthquakes with high speed slip or SSE were triggered. In addition, we found that seismic wave can trigger earthquake or SSE at a patch where stable sliding occurs usually.
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| Free Research Field |
地震学
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| Academic Significance and Societal Importance of the Research Achievements |
地震波により地震やSSEがトリガーされた例は数多く報告されているが，そのメカニズムは明らかになっていなかった．本研究は，実験データから求められた摩擦則に基づき，地震波によって強度弱化が起こってトリガーされることを数値シミュレーションによって示した．
大地震が発生した後，次にどのような地震が起こるか推定することは防災上重要な課題である．本研究はその課題解決に向け，一つのアプローチを提示した．
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