Rate dependence of AE activity during frictional sliding

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Abstract

A velocity-step test was performed to examine effects of the macroscopic sliding-rate on AE activity during steady-state frictional sliding on a pre-cut fault in a granite sample. Both the amplitude-frequency relation and the number of AE events per unit displacement changed in response to a change in the macroscopic sliding-rate. Both the AE activity and its rate-dependence evolved with sliding. The rate dependence of cumulative seismic energy calculated from the AE activity shows a positive correlation to that of friction coefficient, suggesting that the rate dependence of seismic energy is one of the origins of rate-dependent friction, because the seismic energy is a part of frictional energy-loss. Further, the rate dependence of seismic energy is much larger than that of friction, meaning that a ratio of seismic energy to frictional energy-loss depends on the macroscopic sliding rate.

Original languageEnglish
Pages (from-to)26-1-26-4
JournalGeophysical Research Letters
Volume29
Issue number10
DOIs
Publication statusPublished - 2002 May 15

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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