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Vibration-induced slip in sheared granular layers and the micromechanics of dynamic earthquake triggering

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Published 15 September 2011 • Europhysics Letters Association
, , Citation M. Griffa et al 2011 EPL 96 14001 DOI 10.1209/0295-5075/96/14001

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Author affiliations

1 Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Science and Technology, EMPA - Überlandstrasse 129, CH-8600, Dübendorf, Switzerland

2 Solid Earth Geophysics Group, Los Alamos National Laboratory - MS D443, NM 87545, Los Alamos, USA

3 Center for Nonlinear Studies, Los Alamos National Laboratory - MS B258, NM 87545, Los Alamos, USA

4 Department of Geosciences, Pennsylvania State University - PA 16802, State College, USA

5 G3 Center and Energy Institute, Pennsylvania State University - PA 16802, State College, USA

6 Chair of Building Physics, Swiss Federal Institute of Technology in Zürich, ETHZ - CH-8093, Zürich, Switzerland

Dates

  1. Received 13 February 2011
  2. Accepted 11 August 2011
  3. Published
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0295-5075/96/1/14001

Abstract

We perform 2D Molecular Dynamics simulations of sheared granular layers in the presence of applied vibration. A primary goal is to understand the physics of dynamic earthquake triggering. We adopt a mesoscopic measure of non-affine deformation for characterizing the granular dynamics during slip without or with applied vibration. Our results show that the onset of non-affine strains correlates with the onset of slip and appears earlier in the presence of vibration than in its absence, in agreement with the evidence for triggered slip.

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10.1209/0295-5075/96/14001