Thermal imaging on simulated faults during frictional sliding

Details Thermal imaging on simulated faults during frictional sliding Thermal imaging on simulated faults during frictional sliding

2008-01-03

arxiv.org/abs/0801.0479v1

Geophysical Research Letters 33 (2006) L19301

Physics

Geophysics

Scientific paper

10.1029/2006GL027143

Heating during frictional sliding is a major component of the energy budget of earthquakes and represents a potential weakening mechanism. It is therefore important to investigate how heat dissipates during sliding on simulated faults. We present results from laboratory friction experiments where a halite (NaCl) slider held under constant load is dragged across a coarse substrate. Surface evolution and frictional resistance are recorded. Heat emission at the sliding surface is monitored using an infra-red camera. We demonstrate a link between plastic deformations of halite and enhanced heating characterized by transient localized heat spots. When sand 'gouge' is added to the interface, heating is more diffuse. Importantly, when strong asperities concentrate deformation, significantly more heat is produced locally. In natural faults such regions could be nucleation patches for melt production and hence potentially initiate weakening during earthquakes at much smaller sliding velocities or shear stress than previously thought.

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