静态应力扰动对走滑断层阶区附近地震破裂传播影响的二维数值模拟

doi:10.12196/j.issn.1000-3274.2024.02.006

Abstract

Abstract: Capability of dynamic rupture propagation along stepover of strike-slip fault controls the possible size of earthquake rupture. The effects of heterogenous initial stress on dynamic rupture propagation are significant. In the study, we integrate a dynamic rupture propagation model with a static stress perturbance model to construct a heterogenous stress field along strike-slip fault. Then, we investigate the influence of static stress perturbance produced by previous rupture on subsequent rupture near stepover along a strike-slip fault. Our two-dimensional numerical results show that static stress perturbance produced by previous rupture improve the capability of rupture propagating across stepover in the subsequent event significantly even the stepover arrested previous rupture. The influence of various high initial stress on rupture propagation across stepover along a strike-slip is insignificant. Rupture with various high initial stress can propagate across stepover of similar width. Larger stress drop and smaller fault strength ration (S) can improve the capability of rupture over stepover with larger width. So, static stress perturbance produced by previous events should not be ignored when studying the cascading rupture behavior along fault segmentations.

Key words: Strike-slip fault, Stepover, Dynamic rupture propagation, Static stress perturbance, Numerical simulation

CLC Number:

P315.8

WANG Hui, CAO Jian-ling, YAO Qi, SHI Yu-tao, LIU Yue. Two-dimensional Numerical Simulations of Effects of Static Stress Disturbance on Seismic Rupture Propagation Near Stepovers of Striking-slip Fault[J]. EARTHQUAKE, 2024, 44(2): 86-103.

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Two-dimensional Numerical Simulations of Effects of Static Stress Disturbance on Seismic Rupture Propagation Near Stepovers of Striking-slip Fault

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