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Temperature variations of constitutive parameters can significantly affect the fault dynamics
Language
English
Obiettivo Specifico
3.1. Fisica dei terremoti
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/306(2011)
Publisher
Elsevier
Pages (printed)
272-278
Issued date
June 2011
Alternative Location
Abstract
A rate- and state-dependent governing law with temperature-dependent constitutive parameters is
considered on the basis of laboratory inferences. We model the whole seismic cycle of a homogeneous
fault obeying to such a law by adopting a spring-slider dashpot fault analog model. We show that the
variations of the parameter a (accounting for the so-called direct effect) with the temperature cause the
system to enter, at high speeds, in a conditionally stable regime and also in a velocity strengthening regime.
Although we do not observe the complete cessation of slip we can see a severe reduction of the degree of the
instability of the fault. In particular, the peaks of the sliding velocity are reduced, as well as the developed
temperature due to frictional sliding and the released stress during each instability event. Moreover, the
recurrence times are reduced of a factor of two with respect to a reference configuration, where the canonical
formulation of rate and state friction (with temporally constant parameters) is assumed. The obtained results
can help the interpretation of high velocities laboratory experiments and further illuminate the importance of
the temperature in the context of seismic hazard assessment.
considered on the basis of laboratory inferences. We model the whole seismic cycle of a homogeneous
fault obeying to such a law by adopting a spring-slider dashpot fault analog model. We show that the
variations of the parameter a (accounting for the so-called direct effect) with the temperature cause the
system to enter, at high speeds, in a conditionally stable regime and also in a velocity strengthening regime.
Although we do not observe the complete cessation of slip we can see a severe reduction of the degree of the
instability of the fault. In particular, the peaks of the sliding velocity are reduced, as well as the developed
temperature due to frictional sliding and the released stress during each instability event. Moreover, the
recurrence times are reduced of a factor of two with respect to a reference configuration, where the canonical
formulation of rate and state friction (with temporally constant parameters) is assumed. The obtained results
can help the interpretation of high velocities laboratory experiments and further illuminate the importance of
the temperature in the context of seismic hazard assessment.
Type
article
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