Afterslip and aftershocks in the rate-and-state friction law

Details Afterslip and aftershocks in the rate-and-state friction law Afterslip and aftershocks in the rate-and-state friction law

2007-03-28

arxiv.org/abs/physics/0703249v1

Physics

Geophysics

Latex + eps figures, 17 pages, 7 figures, uses AGU style files

Scientific paper

We study how a stress perturbation generated by a mainshock affects a population of faults obeying a rate-state friction law. Depending on the model parameters and on the initial state, the fault exhibits aftershocks, slow earthquakes, or decaying afterslip. We found several regimes with slip rate decaying as a power-law of time, with different characteristic times and exponents. The complexity of the model makes it unrealistic to invert for the friction law parameters from afterslip data. We modeled afterslip measurements for the Southern California Superstition Hills earthquake using the complete rate-and-state law, and found a huge variety of model parameters that can fit the observed data. In particular, it is impossible to distinguish the stable velocity strengthening regime (A>B) from the (potentially) unstable velocity weakening regime (B>A and stiffness k

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