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Etude des séismes lents et du chargement intersismique dans la région de Guerrero au Mexique

Abstract : Recent observations reveal the existence of different slip behaviors on fault, and among them the occurrence of transient aseismic slip events, the so-called slow slip events (SSEs). The general goal of this work is to understand the impact of slow slip events on the seismic cycle. The area of study is located in the southern Mexican subduction zone, around the Guerrero seismic gap. We use continuous GPS measurements of the ground displacements to model the slip on the subduction interface, using a dislocation model in an elastic half space. We can thus constrain the spatial and temporal evolution of two slow slip events (in 2006 and in 2009-2010), as well as the coupling ratio of the subduction interface. Our results highlight the differences in the spatio-temporal evolution of the two slow slip events : during the 2006 SSE, the slip propagated at a velocity of 1 km/day. The 2009-2010 SSE occurred in two sub-events and the second sub-event was triggered by the surface waves of the Maule earthquake (in Chili). Our results also show the lateral variations in the interseismic coupling of the subduction interface : the coupling ratio in the Guerrero gap being only 1/4 of the couling ratio on both sides of the gap. Most of the slip is thus accommodated by slow slip events in the Guerrero seismic gap.
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Submitted on : Saturday, March 17, 2012 - 4:19:22 PM
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  • HAL Id : tel-00680098, version 1



Mathilde Radiguet de la Bastaie. Etude des séismes lents et du chargement intersismique dans la région de Guerrero au Mexique. Sciences de la Terre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENU047⟩. ⟨tel-00680098⟩



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