
Frictional heating on faults: Stable sliding versus stick slip
Author(s) -
Brown Stephen R.
Publication year - 1998
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/98jb00200
Subject(s) - slip (aerodynamics) , mechanics , lubrication , materials science , geology , slip line field , friction coefficient , composite material , shear (geology) , thermodynamics , physics
Laboratory experiments were performed where heat generation was measured during both stable sliding and stick‐slip friction. For a given average slip velocity, stick‐slip sliding produces heat at a considerably lower rate than stable sliding without appealing to high pore pressure or lubrication. These experiments show that faults can be apparently both “strong” when slip initiates and “weak” during rapid sliding, suggesting that different mechanisms operate under the two sliding conditions. If these results apply to the Earth, then all seismogenic faults should produce less heat than creeping fault zones. Possible explanations are that during rapid sliding, in the slip portion of a stick‐slip cycle, either the friction coefficient or the normal stress is reduced by a factor up to about 7. Comparison with other experimental results suggests the reduction of normal stress by interface separation waves is the most likely explanation.