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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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Nonlin. Processes Geophys., 24, 343-349, 2017
https://doi.org/10.5194/npg-24-343-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
11 Jul 2017
Generation and propagation of stick-slip waves over a fault with rate-independent friction
Iuliia Karachevtseva1, Arcady V. Dyskin2, and Elena Pasternak1 1School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Australia
2School of Civil and Resource Engineering, The University of Western Australia, Crawley, Australia
Abstract. Stick-slip sliding is observed at various scales in fault sliding and the accompanied seismic events. It is conventionally assumed that the mechanism of stick-slip over geo-materials lies in the rate dependence of friction. However, the movement resembling the stick-slip could be associated with elastic oscillations of the rock around the fault, which occurs irrespective of the rate properties of the friction. In order to investigate this mechanism, two simple models are considered in this paper: a mass-spring model of self-maintaining oscillations and a one-dimensional (1-D) model of wave propagation through an infinite elastic rod. The rod slides with friction over a stiff base. The sliding is resisted by elastic shear springs. The results show that the frictional sliding in the mass-spring model generates oscillations that resemble the stick-slip motion. Furthermore, it was observed that the stick-slip-like motion occurs even when the frictional coefficient is constant. The 1-D wave propagation model predicts that despite the presence of shear springs the frictional sliding waves move with the P wave velocity, denoting the wave as intersonic. It was also observed that the amplitude of sliding is decreased with time. This effect might provide an explanation to the observed intersonic rupture propagation over faults.

Citation: Karachevtseva, I., Dyskin, A. V., and Pasternak, E.: Generation and propagation of stick-slip waves over a fault with rate-independent friction, Nonlin. Processes Geophys., 24, 343-349, https://doi.org/10.5194/npg-24-343-2017, 2017.
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Short summary
We concentrate on the stick-slip-like movement occurring under rate-independent friction due to the eigenoscillation of the fault faces and the associated wave propagation. Also, a simple mechanism of unusually high shear fracture or sliding zone propagation is considered. This is the P sonic propagation of sliding area over a fault based on the fact that the accumulation of elastic energy in the sliding plates can produce oscillations in the velocity of sliding (friction is constant).
We concentrate on the stick-slip-like movement occurring under rate-independent friction due to...
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