Two-dimensional Numerical Simulations of Effects of Static Stress Disturbance on Seismic Rupture Propagation near Stepovers of Striking-slip Fault
Capability of dynamic rupture propagation along stepover of strike-slip fault con-trols 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 per-turbance produced by previous rupture on subsequent rupture near stepover along a strike-slip fault.Our two-dimensional numerical results show that static stress perturbance pro-duced by previous rupture improve the capability of rupture propagating across stepover in the subsequent event significantly even the stepover arrested previous rupture.The influ-ence 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 ca-pability 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 a-long fault segmentations.
NETL
NSTL
万方数据
