The effects of flash-weakening and damage on the evolution of fault strength and temperature

摘要: The effects of fluid pressurization in altering the fault strength and limiting temperature rise during earthquake slip are modeled for case a thin, but finite, shear zone, with state-dependent properties that chosen to represent conditions along mature at moderate seismogenic depth. We include flash-weakening highly stressed asperity contacts by extending model Rice [1999; 2006] treat relative motion between gouge particles as equal either 1) rate or 2) product particle diameter strain rate. At slips exceeding few centimeters, evolution is relatively insensitive difference these two formulations, predicted considerably greater strain-rate dependent case. Our calculations demonstrate how increasing levels damage can significantly limit reduction strength, resulting more rapid heating ultimately leading onset melting following modest slips.