TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 54 (No. 11), pp. 1077-1083, 2002

Seismic cycle on a strike-slip fault with rate- and state-dependent strength in an elastic layer overlying a viscoelastic half-space

Naoyuki Kato

Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan

(Received December 25, 2001; Revised July 30, 2002; Accepted August 14, 2002)

Abstract: A numerical simulation of seismic cycles is performed using a two-dimensional model with a vertical strike-slip fault in an elastic layer overlying a Maxwellian viscoelastic half-space, where the frictional stress on the fault is assumed to obey a rate- and state-dependent friction law. Simulated seismic cycles in the viscoelastic Earth model are nearly the same as those in a uniform elastic half-space model. The simulated postseismic deformation on the Earth's surface due to viscoelastic relaxation is significant for time duration comparable to the viscoelastic relaxation time following the occurrence of an earthquake, and after that the deformation due to aseismic sliding of the fault dominates over that due to viscoelastic relaxation.

Corresponding author E-mail: nkato@eri.u-tokyo.ac.jp

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