Simulation of dynamic interactions between earthquake ruptures and fluid migration in a fault zone

断层带中地震破裂与流体运移之间的动态相互作用模拟

• 批准号: 12640402
• 负责人: YAMASHITA Teruo
• 金额: $ 1.41万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640402/
• 关键词: fault; permeability; porosity; fracture; earthquake; aftershock; earthquake swarm; simulation

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.

最近的实验室实验表明，断层带中的流体对地震破裂有显著的影响。本文通过模拟流体力学模型参数的时空变化，研究了流体运移对余震发生的影响。我们首先进行了模拟，假设Forchheimer方程的流体流量，这是作为一个扩展的达西方程的动态范围。然而，流体流动方程中的差异不会导致显著不同的结果。因此，我们进行了模拟余震发生假设达西方程。我们发现，似乎潜水员和复杂的余震现象，可以在一个统一的方式通过考虑流体流动的解释。