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SUMMARY We study in-plane ruptures on a bimaterial fault governed by a velocity-weakening friction with a regularized normal stress response. Numerical simulations and analytical estimates provide characterization of the ranges of velocity-weakening scales, nucleation lengths and background stresses for which ruptures behave as cracks or pulses, decaying or(More)
We develop a spectral-element method (SEM) for simulating dynamic rupture on rate-and-state faults and use it to study how the rupture is affected by a shallow fault region of steady-state velocity-strengthening friction. Our comparison of the developed SEM and a spectral boundary-integral method (BIM) for an anti-plane (two-dimensional) test problem shows(More)
We introduce the application of an Arbitrary high-order DERivative (ADER) Dis-continuous Galerkin (DG) method to simulate earthquake rupture dynamics. The ADER-DG method uses triangles as computational cells which simplifies the process of discretization of very complex surfaces and volumes using external automated tools. Discontinuous Galerkin methods are(More)
Introduction Numerical simulations of earthquake rupture dynamics are now common, yet it has been difficult to test the validity of these simulations because there have been few field observations and no analytic solutions with which to compare the results. This paper describes the Southern California Earthquake Center / U.S. Geological Survey (SCEC/USGS)(More)
SUMMARY We perform a systematic parameter space study of the seismic response of a large fault with different levels of heterogeneity, using a 3-D elastic framework within the continuum limit. The fault is governed by rate-and-state friction and simulations are performed for model realizations with frictional and large scale properties characterized by(More)
One of the challenging tasks in predicting near-source ground motion for fu-4 ture earthquakes is to anticipate the spatio-temporal evolution of the rupture process. 5 The final size of an event but also its temporal properties (propagation velocity, slip ve-6 locity) depend on the distribution of shear stress on the fault plane. Though these in-7 cipient(More)
This study investigates near-field ground motion variability due to dynamic rupture models with heterogeneity in the initial shear stress. Ground velocity seismo-grams are synthesized by convolving the time histories of slip velocity obtained from spontaneous dynamic rupture models with Green's functions of the medium calculated with a discrete wavenumber /(More)
Large dynamic stresses near earthquake rupture fronts may induce an in-elastic response of the surrounding materials, leading to increased energy absorption that may affect dynamic rupture. We systematically investigate the effects of off-fault plastic energy dissipation in 2D in-plane dynamic ruptures under velocity-and-state-dependent friction with severe(More)