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Utilisation du bruit sismique ambiant dans le suivi temporel de structures géologiques

Abstract : The ambient noise correlation technique is now widely used in seismology. It is especially useful since data provided do not depend on the occurrence of earthquakes. This technique has been used to construct high-resolution tomographic images of the crust in various regions of the world. More recently, ambient noise correlations have been used to detect changes in elastic properties of the Earth's crust, and monitor the temporal evolution of potentially dangerous geological structures. In this scientific context, my research work has consisted of two main parts : 1/A methodological study to improve the quality of noise-based measurements. Usually, the distribution of noise sources prevents the exact reconstruction of the Green's function in noise correlations, that may introduce bias in noise-based measurements. We propose here two different approaches that can help in suppressing noise source influence in measurements. 2/A monitoring case study in Sichuan (China), associated with the Wenchuan earthquake (12 May 2008, Mw = 7.9). This case study provides many opportunities, with the study of a great continental earthquake and a large amount of data available. We especially investigated the behavior of the crust at different depths, in response to the Wenchuan earthquake.We also present an inversion method in order to locate variations in the medium.
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Submitted on : Tuesday, December 6, 2011 - 2:24:31 PM
Last modification on : Tuesday, December 8, 2020 - 10:20:49 AM
Long-term archiving on: : Wednesday, March 7, 2012 - 2:47:26 AM


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  • HAL Id : tel-00648796, version 1



Bérénice Froment. Utilisation du bruit sismique ambiant dans le suivi temporel de structures géologiques. Sciences de la Terre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENU035⟩. ⟨tel-00648796⟩



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