Propagation Velocity of Pulse-Like Rupture Along Earthquake Faults
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During earthquakes , the rupture front propagates along faults at approximately 40–90 % of the shear or Rayleigh wave velocity, with slip rate often concentrated in a narrow region behind the front. Past studies have considered this phenomenon using a steady-state pulse-like rupture model and a slip-weakening friction law ; however, the results included a trade-off between rupture velocity and the scale of the pulse, which prevents the rupture velocity from being uniquely determined. In this study, we explore this issue and develop a model to determine rupture velocity by considering a friction law based on a numerical simulation of a past study for a slipping plane with its microscopic structure. We combine two models from past studies to construct a relationship between rupture velocity and some tectonophysical/geological parameters.
KeywordsSingular Integral Equation Slip Rate Rupture Velocity Fault Gouge Rupture Propagation
The author is grateful to T. Yamashita and T. Hatano for helpful discussions.
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