Slip-weakening instability on a strike-slip fault with asperity |
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| Authors: | Zhiren Niu and Dangmin Chen |
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| Institution: | (1) Seismological Bureau of Shaanxi Province, Xi’an, China |
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| Abstract: | In this paper, we studied the slip-weakening instability on a finite and vertical strike-slip fault with asperity. We assumed
that the fault strength is uniform in depth, but it is non-uniform in the strike direction, i.e., there is an asperity on
the fault. The segments of the fault with and without asperity follow the same type of constitutive law, but the peak stresses
are different. The material surrounding the fault is represented by elastic plates whose upper-surface and bottom are stress-free.
We use finite element method to study the evolution of theoretical displacement, stress and strain fields that vary with a
remote displacement. Here the displacement and frictional stress are not given in advance, but are determined in the solving
process. According to the results, we compared the theoretical displacemeut and the distribution of frictional stress on the
fault between the stable and unstable slips. In addition, we compared the results in this paper with known results for the
strike-slip fault with a segment of lower strength. |
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| Keywords: | Slip-weakening Instability Asperity Earthquake |
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