2001 Fiscal Year Final Research Report Summary
Simulation of dynamic interactions between earthquake ruptures and fluid migration in a fault zone
| Project/Area Number |
12640402
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMASHITA Teruo Earthquake Research Institute, The University of Tokyo Professor, 地震研究所, 教授 (10114696)
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| Project Period (FY) |
2000 – 2001
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| Keywords | fault / permeability / porosity / fracture / earthquake / aftershock / earthquake swarm / simulation |
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| Research Abstract |
Recent laboratory exoeriments suggest that fluids in a fault zone affect earthquake ruptures significantly. We here study the effects of fluid migration on aftershock occurrence through spatio-temporal changes in hydro-mechanical model parameters in our simulation. We first carried out the simulation assuming the Forchheimer equation for the fluid flow rate, which is regarded as an extension of the Darcy equation to dynamic range. However, the difference in the fluid flow equation does not give rise to significantly different results. We therefore carried out simulation of aftershock occurrence assuming the Darcy equation. We found that seemingly divers and complex aftershock phenomena can be explained in a unified way by the consideration of fluid flow.
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