Simulation of the Transition of Earthquake Rupture from Quasi-static Growth to Dynamic Propagation
Simulation of the Transition of Earthquake Rupture from Quasi-static Growth to Dynamic Propagation
复制标题
地震破裂从准静态增长到动态传播转变的模拟
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Matsu'ura
中科院分区：
文献类型：
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作者：
E. Fukuyama;C. Hashimoto;M. Matsu'ura
摘要：我们使用边界积分方程方法模拟了从准静态增长到动态传播的破裂转变。为了建立物理上合理的地震周期模型，我们必须在准静态模拟的背景下评估动态破裂传播。我们在准静态模拟中使用了地震前的应力分布快照。所得应力将反馈至准静态模拟。由于准静态模拟使用了滑移和时间相关的本构关系，因此摩擦定律本身随时间而演变。因此，我们使用与准静态模拟一致的动态破裂传播的滑移弱化本构关系。我们模拟了圣安德烈亚斯型走滑断层，其中存在两种不同尺寸的粗糙体。
Abstract— We have simulated a rupture transition from quasi-static growth to dynamic propagation using the boundary integral equation method. In order to make a physically reasonable model of earthquake cycle, we have to evaluate the dynamic rupture propagation in the context of quasi-static simulation. We used a snapshot of the stress distribution just before the earthquake in the quasi-static simulation. The resultant stress will be fed back to the quasi-static simulation. Since the quasi-static simulation used the slip-and time-dependent constitutive relation, the friction law itself evolves with time. Thus, we used the slip-weakening constitutive relation for dynamic rupture propagation consistent with that used for the quasi-static simulation. We modeled a San Andreas type strike-slip fault, in which two different size asperities existed.