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Rate dependence of AE activity during frictional sliding
Author(s) -
Yabe Yasuo
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014369
Subject(s) - amplitude , displacement (psychology) , energy (signal processing) , acoustic emission , geology , mechanics , materials science , physics , composite material , optics , psychology , quantum mechanics , psychotherapist
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.