On the physical mechanism of silent slip events along the deeper part of the seismogenic zone

Details On the physical mechanism of silent slip events along the deeper part of the seismogenic zone On the physical mechanism of silent slip events along the deeper part of the seismogenic zone

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30i..42s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 9, pp. 42-1, CiteID 1489, DOI 10.1029/2003GL017047

Physics

20

Seismology: Earthquake Dynamics And Mechanics, Seismology: Theory And Modeling, Geodesy And Gravity: General Or Miscellaneous, Tectonophysics: Rheology-Crust And Lithosphere

Scientific paper

To investigate the mechanism of recently observed silent slip events, we simulated earthquake preparation processes using the Dieterich/Ruina rate- and state-dependent friction law. To ensure realistic modeling of the unstable-stable transition, we considered small cut-off velocity to an evolution effect in the friction law for the transition zone. When the cut-off velocity to the evolution effect is significantly smaller than that of a direct effect, steady state friction behaves as velocity weakening at low slip velocity and velocity strengthening at high slip velocity. This frictional behavior was experimentally and theoretically confirmed for the unstable-stable transition zone. The results of our numerical simulations show that silent slips of which velocity is higher than the velocity of relative plate motion, eventually propagates horizontally along the unstable-stable transition over a period of several years. Silent slip events can be interpreted as being caused by the transitional behavior of the fault constitutive law.

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