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Title: Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering: TRIGGERED SLIP IN SHEARED GRANULAR GOUGE

Abstract

A fundamental mystery in earthquake physics is “how can an earthquake be triggered by distant seismic sources?” We use discrete element method simulations of a granular layer, during stick slip, that is subject to transient vibrational excitation to gain further insight into the physics of dynamic earthquake triggering. We also observe delayed triggering of slip in the granular gouge, using Coulomb friction law for grains interaction. We find that at a critical vibrational amplitude (strain) there is an abrupt transition from negligible time-advanced slip (clock advance) to full clock advance; i.e., transient vibration and triggered slip are simultaneous. Moreover, the critical strain is of order 10 -6, similar to observations in the laboratory and in Earth. The transition is related to frictional weakening of the granular layer due to a dramatic decrease in coordination number and the weakening of the contact force network. Associated with this frictional weakening is a pronounced decrease in the elastic modulus of the layer. The study has important implications for mechanisms of triggered earthquakes and induced seismic events and points out the underlying processes in response of the fault gouge to dynamic transient stresses.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Swiss Federal Inst. of Technology, Zurich (Switzerland). Dept. of Civil, Environmental and Geomatic Engineering; Swiss Federal Lab. for Materials Science and Technology, Dubendorf (Switzerland)
  2. Swiss Federal Lab. for Materials Science and Technology, Dubendorf (Switzerland)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Solid Earth Geophysics Group; Univ. of Nevada, Reno, NV (United States). Dept. of Physics
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Solid Earth Geophysics Group
  5. Pennsylvania State Univ., University Park, PA (United States). Dept. of Geosciences and G3 Centre and Energy Inst.
  6. Swiss Federal Lab. for Materials Science and Technology, Dubendorf (Switzerland); Swiss Federal Inst. of Technology, Zurich (Switzerland). Chair of Building Physics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1340921
Report Number(s):
LA-UR-16-22288
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 22; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Earth Sciences

Citation Formats

Ferdowsi, Behrooz, Griffa, Michele, Guyer, Robert A., Johnson, Paul A., Marone, Chris, and Carmeliet, Jan. Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering: TRIGGERED SLIP IN SHEARED GRANULAR GOUGE. United States: N. p., 2015. Web. doi:10.1002/2015GL066096.
Ferdowsi, Behrooz, Griffa, Michele, Guyer, Robert A., Johnson, Paul A., Marone, Chris, & Carmeliet, Jan. Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering: TRIGGERED SLIP IN SHEARED GRANULAR GOUGE. United States. doi:10.1002/2015GL066096.
Ferdowsi, Behrooz, Griffa, Michele, Guyer, Robert A., Johnson, Paul A., Marone, Chris, and Carmeliet, Jan. Thu . "Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering: TRIGGERED SLIP IN SHEARED GRANULAR GOUGE". United States. doi:10.1002/2015GL066096. https://www.osti.gov/servlets/purl/1340921.
@article{osti_1340921,
title = {Acoustically induced slip in sheared granular layers: Application to dynamic earthquake triggering: TRIGGERED SLIP IN SHEARED GRANULAR GOUGE},
author = {Ferdowsi, Behrooz and Griffa, Michele and Guyer, Robert A. and Johnson, Paul A. and Marone, Chris and Carmeliet, Jan},
abstractNote = {A fundamental mystery in earthquake physics is “how can an earthquake be triggered by distant seismic sources?” We use discrete element method simulations of a granular layer, during stick slip, that is subject to transient vibrational excitation to gain further insight into the physics of dynamic earthquake triggering. We also observe delayed triggering of slip in the granular gouge, using Coulomb friction law for grains interaction. We find that at a critical vibrational amplitude (strain) there is an abrupt transition from negligible time-advanced slip (clock advance) to full clock advance; i.e., transient vibration and triggered slip are simultaneous. Moreover, the critical strain is of order 10-6, similar to observations in the laboratory and in Earth. The transition is related to frictional weakening of the granular layer due to a dramatic decrease in coordination number and the weakening of the contact force network. Associated with this frictional weakening is a pronounced decrease in the elastic modulus of the layer. The study has important implications for mechanisms of triggered earthquakes and induced seismic events and points out the underlying processes in response of the fault gouge to dynamic transient stresses.},
doi = {10.1002/2015GL066096},
journal = {Geophysical Research Letters},
number = 22,
volume = 42,
place = {United States},
year = {2015},
month = {11}
}

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