Investigation of stress field and pulverization mechanism at the fault rapture front propagating at a high speed

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In order to clarify the mechanism of rock pulverization around fault, a series of stick-slip experiment was conducted with a gas-medium triaxial apparatus, recording strains with5MHz sampling rate for up to10 channels. The mechanical data confirmed a supershear velocity of the propagation of rapture front during large stick-slip. Fracture pattern in the pulverized cores shows obvious dependence on the slip direction. It is likely that anomalously high axial stress caused strong tension stress on the slip plane during slip resulted in pervasive mode I fractures.