Interpretation of various slip modes on a plate boundary based on laboratory and numerical experiments

Details Interpretation of various slip modes on a plate boundary based on laboratory and numerical experiments Interpretation of various slip modes on a plate boundary based on laboratory and numerical experiments

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ep%26s...56..795y&link_type=abstract

Earth, Planets and Space, Volume 56, p. 795-801.

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Scientific paper

This paper discusses various slip modes on a plate boundary on the basis of a two-degree-of-freedom block-spring model and large-scale biaxial experiments, including a new experimental result on afterslip. We conducted slip experiments using large granite blocks with a pre-existing fault surface of 100 cm in length. Velocity-strengthening friction was given over a half of the fault length by inserting a thin Teflon sheet, while the other half retained velocity-weakening friction of the bare rock surface. Under a loading at a constant velocity, dynamic stick-slip repeated on the velocity-weakening region, causing afterslip on the velocity-strengthening region. The velocitystrengthening region experienced small coseismic slip as well, with the magnitude decreasing with the distance from the velocity-weakening region. The behaviors observed in the laboratory experiments were quantitatively simulated by a two-degree-of-freedom block-spring model, in which two blocks (Block 1 and Block 2) are connected by a liner spring and driven by a slowly moving driver. The friction on each block was assumed to obey rate and state dependent friction law. When a - b was assumed to be negative for Block 1, and positive for Block 2, afterslip occurred at Block 2. This model can also reproduce wide spectrum of slip modes by adjusting frictional parameters.

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