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Title: Laboratory-developed contact models controlling instability on frictional faults: FORESHOCKS ON FRICTIONAL FAULTS

Abstract

Laboratory experiments were performed on a polymethyl methacrylate (PMMA)-PMMA frictional interface in a direct shear apparatus in order to gain understanding of fault dynamics leading to gross rupture. Actual asperity sizes and locations along the interface were characterized using a pressure-sensitive film. Slow aseismic slip accumulated nonuniformly along the fault and showed dependency on the applied normal force-increased normal force resulted in higher slip gradients. The slow slip front propagated from the trailing (pushed) edge into a region of more densely distributed asperities at rates between 1 and 9.5 mm/s. Foreshocks were detected and displayed impulsive signals with source radii ranging between 0.21 and 1.09 mm; measurements made using the pressure-sensitive film were between 0.05 and 1.2 mm. The spatiotemporal clustering of foreshocks and their relation to the elastodynamic energy released was dependent on the normal force. In the region where foreshocks occurred, qualitative optical measurements of the asperities along the interface were used to visualize dynamic changes occurring during the slow slip phase. To better understand the nucleation process, a quasi-static asperity finite element (FE) model was developed and focused in the region where foreshocks clustered. The FE model consisted of 172 asperities, located and sized based on pressure-sensitivemore » film measurements. The numerical model provides a plausible explanation as to why foreshocks cluster in space and observed a normal force dependency and lend credence to Ohnaka’s nucleation model.« less

Authors:
 [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1512146
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 120; Journal Issue: 6; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Selvadurai, Paul A., and Glaser, Steven D. Laboratory-developed contact models controlling instability on frictional faults: FORESHOCKS ON FRICTIONAL FAULTS. United States: N. p., 2015. Web. doi:10.1002/2014JB011690.
Selvadurai, Paul A., & Glaser, Steven D. Laboratory-developed contact models controlling instability on frictional faults: FORESHOCKS ON FRICTIONAL FAULTS. United States. doi:10.1002/2014JB011690.
Selvadurai, Paul A., and Glaser, Steven D. Thu . "Laboratory-developed contact models controlling instability on frictional faults: FORESHOCKS ON FRICTIONAL FAULTS". United States. doi:10.1002/2014JB011690. https://www.osti.gov/servlets/purl/1512146.
@article{osti_1512146,
title = {Laboratory-developed contact models controlling instability on frictional faults: FORESHOCKS ON FRICTIONAL FAULTS},
author = {Selvadurai, Paul A. and Glaser, Steven D.},
abstractNote = {Laboratory experiments were performed on a polymethyl methacrylate (PMMA)-PMMA frictional interface in a direct shear apparatus in order to gain understanding of fault dynamics leading to gross rupture. Actual asperity sizes and locations along the interface were characterized using a pressure-sensitive film. Slow aseismic slip accumulated nonuniformly along the fault and showed dependency on the applied normal force-increased normal force resulted in higher slip gradients. The slow slip front propagated from the trailing (pushed) edge into a region of more densely distributed asperities at rates between 1 and 9.5 mm/s. Foreshocks were detected and displayed impulsive signals with source radii ranging between 0.21 and 1.09 mm; measurements made using the pressure-sensitive film were between 0.05 and 1.2 mm. The spatiotemporal clustering of foreshocks and their relation to the elastodynamic energy released was dependent on the normal force. In the region where foreshocks occurred, qualitative optical measurements of the asperities along the interface were used to visualize dynamic changes occurring during the slow slip phase. To better understand the nucleation process, a quasi-static asperity finite element (FE) model was developed and focused in the region where foreshocks clustered. The FE model consisted of 172 asperities, located and sized based on pressure-sensitive film measurements. The numerical model provides a plausible explanation as to why foreshocks cluster in space and observed a normal force dependency and lend credence to Ohnaka’s nucleation model.},
doi = {10.1002/2014JB011690},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 120,
place = {United States},
year = {2015},
month = {4}
}

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