Effect of Slip Zone Structure on Earthquake Rupture Velocity
Source abstract
Abstract
The paper presents a brief analysis of the accumulated data on fast dynamics of earthquake ruptures and their qualitative comparison with the numerical results on supershear rupture propagation along homogeneous and heterogeneous fault surfaces. Calculation methods and parameters are described. The numerical results indicate that the rupture velocity in strong earthquakes can vary in a wide range, exceeding significantly the Rayleigh wave velocity treated as the maximum possible crack velocity in conventional fracture mechanics. It is shown that a necessary condition for the transition to supershear rupture propagation along the heterogeneous contact surface is the presence of a sufficient number of asperity contact spots that experience rapid frictional weakening during shear. The rupture velocity can periodically decrease or increase in the case of a heterogeneous fracture surface. Systematic variation in fault properties along strike increases the probability of supershear rupture in old contact segments.
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Research context
OpenAlex topics: earthquake and tectonic studies · High-pressure geophysics and materials · Geotechnical and Geomechanical Engineering
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References (22)
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