Understanding of slip-weakening and -strengthening in a single framework of modeling and its seismological implications

Statistics – Computation

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Physical Properties Of Rocks: Permeability And Porosity, Physical Properties Of Rocks: Transport Properties, Seismology: Earthquake Dynamics (1242), Seismology: Theory, Seismology: Computational Seismology

Scientific paper

We theoretically study dynamic fault slip taking account of thermoporoelastic effects including inelastic porosity change; the porosity on the fault is assumed to increase inelastically with increasing fault slip. We find in the analysis of a 1D fault model that qualitative nature of system behavior is controlled by a single nondimensional parameter S u , a quantity proportional to the increase rate of inelastic porosity divided by the thickness of shear heating zone. The change of value of S u is found to cause slip-weakening as well as slip-strengthening. It is reported in some studies that the radiation efficiency estimated seismologically exceeds unity for some earthquakes, which contradicts its definition. This paradox can be solved if we assume a relatively large S u value for these earthquakes.

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