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DYNAMIC RUPTURE WITH OFF-FAULT CONTINUUM DAMAGE Jean-Paul Ampuero1
 

Summary: DYNAMIC RUPTURE WITH OFF-FAULT CONTINUUM DAMAGE
Jean-Paul Ampuero1
, Yehuda Ben-Zion2
and Vladimir Lyakhovski3
1 Institute of Geophysics, ETH Zšurich. ampuero@erdw.ethz.ch
2 Department of Earth Sciences, University of Southern California
3 Geological Survey of Israel, Jerusalem
INTRODUCTION
High stress concentration close to a dynamic rupture front can produce rock damage (reduction
of elastic moduli) in the material surrounding the fault. Off-fault yielding and energy absorption
in the damage process should reduce the amplitude of the ground motion. However, the reduced
elastic moduli in the damaged zone can amplify locally the motion and create a waveguide that
may allow the motion to propagate with little geometric attenuation. In addition, the asymmetric
damage generated in the in-plane rupture mode may produce bimaterial interfaces that can reduce the
frictional dissipation and increase the radiation efficiency. Off-fault damage is of special importance
for ruptures running along faults that separate rocks of different elastic properties, because they can
generate asymmetric patterns of material degradation that might be observable in the field.
Previous studies incorporated plastic yielding in simulations of dynamic rupture (Andrews, 1975,
2005; Ben-Zion and Shi, 2005; Templeton et al., 2007) while keeping the elastic moduli unchanged.
Here we examine dynamic earthquake ruptures on a frictional fault considering a continuum dam-

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences