Effect of Pressure Rate on Rate and State Frictional Slip

J. W. Rudnicki*, Y. Zhan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article numbere2020GL089426
JournalGeophysical Research Letters
Volume47
Issue number21
DOIs
StatePublished - Nov 16 2020

Keywords

  • failure
  • friction
  • instability
  • pressure rate
  • rate and state

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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