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Upper limit on damage zone thickness controlled by seismogenic depth

Ampuero, Jean Paul and Mao, Xiaolin (2017) Upper limit on damage zone thickness controlled by seismogenic depth. In: Fault Zone Dynamic Processes: Evolution of Fault Properties During Seismic Rupture. American Geophysical Union , Washington, DC , pp. 243-254. ISBN 978-1-119-15688-8.

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The thickness of fault damage zones, a characteristic length of the cross-fault distribution of secondary fractures, significantly affects fault stress, earthquake rupture, ground motions and crustal fluid transport. Field observations indicate that damage zone thickness scales with accumulated fault displacement at short displacements, but saturates at few hundred meters for displacements larger than few kilometers. To explain this transition of scaling behavior, we conduct 3D numerical simulations of dynamic rupture with off-fault inelastic deformation on long strike-slip faults. We find that the distribution of coseismic inelastic strain is controlled by the transition from crack-like to pulse-like rupture propagation associated with saturation of the seismogenic depth. The yielding zone reaches its maximum thickness when the rupture becomes a stable pulse-like rupture. Considering fracture mechanics theory, we show that seismogenic depth controls the upper bound of damage zone thickness on mature faults by limiting the efficiency of stress concentration near earthquake rupture fronts. We obtain a quantitative relation between limiting damage zone thickness, background stress, dynamic fault strength, off fault yield strength and seismogenic depth, which agrees with first-order field observations. Our results help linking dynamic rupture processes with field observations, and contribute to a fundamental understanding of damage zone properties.

Item Type:Book Section
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URLURL TypeDescription Table of Contents
Ampuero, Jean Paul0000-0002-4827-7987
Mao, Xiaolin0000-0002-8410-4629
Additional Information:© 2017 John Wiley & Sons, Inc. This work was supported by the Southern California Earthquake Center (funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038) and by the National Science Foundation (CAREER award EAR-1151926). We thank Yoshihiro Kaneko for sharing his version of the SPECFEM3D code modified for the SCEC TPV27 benchmark, and Steve Day and an anonymous reviewer for their stimulating comments.
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:Damage zone; Seismogenic depth; Pulse-like rupture; Fracture; Strike-slip fault
Record Number:CaltechAUTHORS:20170509-142306720
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77313
Deposited By: Tony Diaz
Deposited On:12 May 2017 22:31
Last Modified:03 Oct 2019 17:56

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