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 language | English (US) |
|---|---|
| Article number | e2020GL089426 |
| Journal | Geophysical Research Letters |
| Volume | 47 |
| Issue number | 21 |
| DOIs | |
| State | Published - Nov 16 2020 |
Funding
Y. Z. thanks the University of Science and Technology Beijing for support and Northwestern University for hosting him during his visit from 1 July 2018 to 1 January 2019. J. W. R. thanks Ghassan Shahin for assistance with the typesetting. We are grateful to reviewers Chris Marone and Paul Segall for their thorough reading of the manuscript and many constructive comments that significantly improved the manuscript.
Keywords
- failure
- friction
- instability
- pressure rate
- rate and state
ASJC Scopus subject areas
- Geophysics
- General Earth and Planetary Sciences