LUCILE BRUHAT PhD, Geophysics

Near-field radiation from stopping ruptures (Second-year Master research project)

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in collaboration with Harsha Bhat (Institut de Physique du Globe, Paris)

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When a seismic rupture ends, a stopping phase is radiated out at the tip of the ruptured area, changing the surrounding seismic radiation. This study aimed at describing the near-field effect of stopping phases. We modeled 2D dynamic propagation of an in-plane shear fault, separating two semi-infinite elastic media, for sub-Rayleigh and Supershear rupture velocities. The rupture stop as it encounters a barrier, defined as a region with a higher frictional resistance over a given distance. For different shapes and lengths of the barrier, we analyzed the high-frequency velocity spectra obtained from stations localized near the fault.