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Imagerie sismique 3D de la zone de subduction à la frontière Colombie-Equateur

Abstract : The Northern Andean convergent margin, where the Nazca plate plunges below the South American plate, is characterized by a morphologic, structural and seismic segmentation. Four subduction earthquakes shook the Colombian-Ecuador segment during the last century: 1906, 1942, 1958 and 1979. To determine the lithosperic structure at the Colombia-Ecuador border, and define the spatial extension of some velocity heterogeneities associated with margin seismic behaviour, Geoazur designed the geophysical experiment Esmeraldas between March and April 2005. This thesis consists in obtaining a 3D velocity model of the area by tomographic inversion of first arrival traveltimes, picked from OBS and land stations. Our 3D tomographic image shows two remarkable structures in the margin, that seem to have an impact on the regional geodynamic: a low velocity gradient backstop and a low velocity zone. Both structures seem to be at the seaward limit of the 1958 earthquake rupture zone.
keyword : imagerie subduction
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Contributor : Publications Géoazur <>
Submitted on : Wednesday, December 9, 2009 - 3:00:17 PM
Last modification on : Wednesday, December 9, 2020 - 3:08:05 PM
Long-term archiving on: : Thursday, June 17, 2010 - 8:37:29 PM


  • HAL Id : tel-00440140, version 1


L.C. Garcia Cano. Imagerie sismique 3D de la zone de subduction à la frontière Colombie-Equateur. Sciences de la Terre. Université Nice Sophia Antipolis, 2009. Français. ⟨tel-00440140⟩



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