Evaluation of the residual stress on the fault plane by stick slip experiment and high resolution observation of slip plane

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In order to clarify how rupture propagates and off-fault damages develop during a stick-slip, an experimental study on the stick-slip with a single crystal of synthetic quartz and quartz aggregate naturally formed has been performed. During large stick-slips at high peak stresses, the core samples were intensely pulverized with fragment size down to several ten nm and no shear deformation. The rupture velocities during such intense pulverization were estimated exceeding shear wave velocity. Anomalously high stress, strain and strain rate induced by supersonic wave radiated from rupture front probably caused to intense pulverization.We also performed residual stress measurement of damaged quartz around shear plane using EBSD patterns, and obtained clear EBSD patterns available for measurement of lattice strain quantitatively.