Shear strain localization in elastodynamic rupture simulations

Eric G. Daub; Mary Elizabeth Manning; Jean M. Carlson

doi:10.1029/2008GL033835

Shear strain localization in elastodynamic rupture simulations

Eric G. Daub, Mary Elizabeth Manning, Jean M. Carlson

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

We study strain localization as an enhanced velocity weakening mechanism on earthquake faults. Fault friction is modeled using Shear Transformation Zone (STZ) Theory, a microscopic physical model for non-affine rearrangements in granular fault gouge. STZ Theory is implemented in spring slider and dynamic rupture models of faults. We compare dynamic shear localization to deformation that is uniform throughout the gouge layer, and find that localized slip enhances the velocity weakening of the gouge. Localized elastodynamic ruptures have larger stress drops and higher peak slip rates than ruptures with homogeneous strain.

Original language	English (US)
Article number	L12310
Journal	Geophysical Research Letters
Volume	35
Issue number	12
DOIs	https://doi.org/10.1029/2008GL033835
State	Published - Jun 28 2008

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1029/2008GL033835

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AB - We study strain localization as an enhanced velocity weakening mechanism on earthquake faults. Fault friction is modeled using Shear Transformation Zone (STZ) Theory, a microscopic physical model for non-affine rearrangements in granular fault gouge. STZ Theory is implemented in spring slider and dynamic rupture models of faults. We compare dynamic shear localization to deformation that is uniform throughout the gouge layer, and find that localized slip enhances the velocity weakening of the gouge. Localized elastodynamic ruptures have larger stress drops and higher peak slip rates than ruptures with homogeneous strain.

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Shear strain localization in elastodynamic rupture simulations

Abstract

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