Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 122, Issue 12, Pages 9658-9688Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JB014228
Keywords
microphysical model; slip stability criterion; linear stability analysis; critical stiffness; cutoff velocity
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Funding
- European Research Council starting grant SEISMIC [335915]
- SEISMIC [335915]
- Netherlands Organisation for Scientific research (NWO) VIDI [854.12.011]
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Physical constraints for the parameters of the rate-and-state friction (RSF) laws have been mostly lacking. We presented such constraints based on a microphysical model and demonstrated the general applicability to granular fault gouges deforming under hydrothermal conditions in a companion paper. In this paper, we examine the transition velocities for contrasting frictional behavior (i.e., strengthening to weakening and vice versa) and the slip stability of the model. The model predicts a steady state friction coefficient that increases with slip rate at very low and high slip rates and decreases in between. This allows the transition velocities to be theoretically obtained and the unstable slip regime (V-sw
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