Resetting of IRSL and IRPL signals by frictional heating in experimentally sheared Granite rock at seismic slip rates

Abstract

Recent studies on natural and experimental seismic faults have revealed that frictional heating plays an important role in earthquake dynamics. We report IRSL and IRPL signals changes in the granite rock after frictional experiments. Our results indicate that high-rate (2.0 m/s) frictional heating during seismic events can reset the 'geologic clocks' of fault rocks. Thus, the IRSL and IRPL signal in granite from natural fault zones has the potential to directly constrain the age of seismic events. Whereas low-rate (2.0 mm/s) frictional slip, even over long times (1000 s), does not reset the IRSL and IRPL signals in granite. The result is similar to the quartz gouge（Hui Li Yang., et al., 2019）.