Volume 96, Number 1, October 2011
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||15 September 2011|
Vibration-induced slip in sheared granular layers and the micromechanics of dynamic earthquake triggering
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
Accepted: 11 August 2011
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.
PACS: 45.70.-n – Granular systems / 61.43.-j – Disordered solids / 91.30.Px – Earthquakes
© EPLA, 2011
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