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Effect of Pressure Rate on Rate and State Frictional Slip
  • John W. Rudnicki,
  • Yatai Zhan
John W. Rudnicki
Northwestern University, Northwestern University, Northwestern University

Corresponding Author:[email protected]

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Yatai Zhan
University of Science and Technology Beijing, University of Science and Technology Beijing, University of Science and Technology Beijing
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Abstract

This paper analyzes the effects of pore pressure rate for a spring - block system that is a simple model of a laboratory experiment. Pore pressure is increased at a constant rate in a remote reservoir and slip is governed by rate and state friction. The frequency of rapid slip events increases with the increase of a nondimensional pressure rate that is the ratio of the time scale of frictional sliding to that for pressure increase. As the pressure rate increases, the more rapid increase of pore pressure on the slip surface quickly stabilizes slip events due to rate and state friction. Rate and state and pressure rate effects interact in a limited range of pressure rate and diffusivity. This range includes pressure rates and diffusivities representative of recent laboratory experiments.
16 Nov 2020Published in Geophysical Research Letters volume 47 issue 21. 10.1029/2020GL089426