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Abstract: We study strain localization as an enhanced velocity weakening mechanism onearthquake faults. Fault friction is modeled using Shear Transformation ZoneSTZ Theory, a microscopic physical model for non-affine rearrangements ingranular fault gouge. STZ Theory is implemented in spring slider and dynamicrupture models of faults. We compare dynamic shear localization to deformationthat is uniform throughout the gouge layer, and find that localized slipenhances the velocity weakening of the gouge. Localized elastodynamic ruptureshave larger stress drops and higher peak slip rates than ruptures withhomogeneous strain.



Author: Eric G. Daub, M. Lisa Manning, Jean M. Carlson

Source: https://arxiv.org/







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