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Effets de l'hétérogénéité des failles sur la dynamique de la rupture : étude numérique et expérimentale

Abstract : Seismic rupture dynamics can be highly dependent on the heterogeneity of faults, modelised by heterogeneity of the friction properties. We address this issue both numericaly and experimentaly. In the numerical study, we study the effects of small scale heterogeneity in 3D dynamic rupture modeling. We develop an homogenizing technique that allows to reproduce the effects of small scale hetereogeneity during the initiation phase, and for simple examples, during the propagation phase of the rupture. We then present a new experimental technique for laboratory study of rupture propagation. By coupling a classical friction experiment with an imaging technique by ultrafast ultrasonic speckle interferometry, we can observe the propagation of the rupture at the friction interface and the full-wave field emited in the bulk. We present the first experimental results and then use this apparatus to study the effect of heterogeneity on dynamic rupture propagation.
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Soumaya Latour. Effets de l'hétérogénéité des failles sur la dynamique de la rupture : étude numérique et expérimentale. Sciences de la Terre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENU055⟩. ⟨tel-00721946⟩

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