Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30m..14y&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 13, pp. 14-1, CiteID 1681, DOI 10.1029/2003GL017439
Physics
13
Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Dynamics And Mechanics, Seismology: Theory And Modeling
Scientific paper
We consider a two-degree-of-freedom block-spring model, in which two blocks (Block 1 and Block 2) are connected by a spring and driven by a slowly moving driver. Assuming a rate- and state-dependent friction law, we set the friction parameters such that dynamic instability occurs at Block 1. Episodic aseismic slip occurs at Block 2 when its frictional parameters are near the stability transition. When the stress has accumulated to approximately a steady state level during an interseismic period, Block 2 starts a slow slip. Quasi-static oscillation in the stress and slip velocity occurs with decaying fluctuation amplitudes leading to the steady state values. The decaying oscillation could be a plausible generation mechanism of the episodic aseismic slip observed in the Tokai district, Japan, since 2001. We also consider various slip modes on a plate boundary based on this two-block model associated with the interaction between different frictional properties.
Kato Naoyuki
Yoshida Shingo
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