Modélisation analogique du glissement sur une faille

Abstract : The presence of defaults on the surface of tectonic faults can affect the behaviour of the rupture along those interfaces. However, because of the limited resolution of the faults imaging at depth, the implication of these heterogeneities remains hard to quantify. We present here an analogic approach enabling the precision of the impact of the heterogeneities on the fracture propagation. On one hand, this analysis lays on the use of an experimental setup ensuring the monitoring of a fracture propagating under an imposed stress, normal to the rupture interface (mode I). The used model, implying an acoustic and an optical monitoring of the fracture front advance, leads us to the determination of the impact of asperities on the energy partitioning between seismic and aseismic processes. We make the link between radiation efficiency and rupture velocity, locally affected by the presence of microstructures along the interface. On another hand, to extend our results to other rupture modes, which are observed more often during rupture on tectonic faults, we get interested in the adaptation of our experimental setup for the observation of a fracture propagating under shear stress (mode III). The analysis of morphologic and dynamic properties of the mode III crack advance shows results similar to those obtained for mode I. This suggests eventually that the results observed in mode I can be extended to other rupture modes.
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Camille Jestin. Modélisation analogique du glissement sur une faille. Géophysique [physics.geo-ph]. Université de Strasbourg, 2018. Français. ⟨NNT : 2018STRAH017⟩. ⟨tel-02155962⟩

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