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Title: On factors controlling precursor slip fronts in the laboratory and their relation to slow slip events in nature

Abstract

Spatial variations in frictional properties on natural faults are believed to be a factor influencing the presence of slow slip events (SSEs). This effect was tested on a laboratory frictional interface between two polymethyl methacrylate (PMMA) bodies. We studied the evolution of slip and slip rates that varied systematically based on the application of both high and low normal stress (σ0=0.8 or 0.4 MPa) and the far-field loading rate (VLP). A spontaneous, frictional rupture expanded from the central, weaker, and more compliant section of the fault that had fewer asperities. Slow rupture propagated at speeds Vslow~0.8 to 26 mm s-1 with slip rates from 0.01 to 0.2 μm s-1, resulting in stress drops around 100 kPa. During certain nucleation sequences, the fault experienced a partial stress drop, referred to as precursor detachment fronts in tribology. Only at the higher level of normal stress did these fronts exist, and the slip and slip rates mimicked the moment and moment release rates during the 2013–2014 Boso SSE in Japan. The laboratory detachment fronts showed rupture propagation speeds Vslow/VRϵ (5 to 172) × 10-7 and stress drops ~ 100 kPa, which both scaled to the aforementioned SSE. Distributions of asperities, measured using amore » pressure sensitive film, increased in complexity with additional normal stress—an increase in normal stress caused added complexity by increasing both the mean size and standard deviation of asperity distributions, and this appeared to control the presence of the detachment front.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Univ. of California, Berkeley, CA (United States). Civil and Environmental Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1479305
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 6; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; slow slip evolution; precursory detachment fronts; laboratory friction studies; asperity formations; slow slip events (SSEs)

Citation Formats

Selvadurai, Paul A., Glaser, Steven D., and Parker, Jessica M. On factors controlling precursor slip fronts in the laboratory and their relation to slow slip events in nature. United States: N. p., 2017. Web. doi:10.1002/2017GL072538.
Selvadurai, Paul A., Glaser, Steven D., & Parker, Jessica M. On factors controlling precursor slip fronts in the laboratory and their relation to slow slip events in nature. United States. https://doi.org/10.1002/2017GL072538
Selvadurai, Paul A., Glaser, Steven D., and Parker, Jessica M. Fri . "On factors controlling precursor slip fronts in the laboratory and their relation to slow slip events in nature". United States. https://doi.org/10.1002/2017GL072538. https://www.osti.gov/servlets/purl/1479305.
@article{osti_1479305,
title = {On factors controlling precursor slip fronts in the laboratory and their relation to slow slip events in nature},
author = {Selvadurai, Paul A. and Glaser, Steven D. and Parker, Jessica M.},
abstractNote = {Spatial variations in frictional properties on natural faults are believed to be a factor influencing the presence of slow slip events (SSEs). This effect was tested on a laboratory frictional interface between two polymethyl methacrylate (PMMA) bodies. We studied the evolution of slip and slip rates that varied systematically based on the application of both high and low normal stress (σ0=0.8 or 0.4 MPa) and the far-field loading rate (VLP). A spontaneous, frictional rupture expanded from the central, weaker, and more compliant section of the fault that had fewer asperities. Slow rupture propagated at speeds Vslow~0.8 to 26 mm s-1 with slip rates from 0.01 to 0.2 μm s-1, resulting in stress drops around 100 kPa. During certain nucleation sequences, the fault experienced a partial stress drop, referred to as precursor detachment fronts in tribology. Only at the higher level of normal stress did these fronts exist, and the slip and slip rates mimicked the moment and moment release rates during the 2013–2014 Boso SSE in Japan. The laboratory detachment fronts showed rupture propagation speeds Vslow/VRϵ (5 to 172) × 10-7 and stress drops ~ 100 kPa, which both scaled to the aforementioned SSE. Distributions of asperities, measured using a pressure sensitive film, increased in complexity with additional normal stress—an increase in normal stress caused added complexity by increasing both the mean size and standard deviation of asperity distributions, and this appeared to control the presence of the detachment front.},
doi = {10.1002/2017GL072538},
journal = {Geophysical Research Letters},
number = 6,
volume = 44,
place = {United States},
year = {Fri Feb 17 00:00:00 EST 2017},
month = {Fri Feb 17 00:00:00 EST 2017}
}

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