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Analyse de la polarisation de données multi-composantes à partir d'une seule station ou d'une antenne : méthodes et applications à la caractérisation du champ d'ondes sismiques

Abstract : The analysis of the seismic wavefield is an essential pre-requisite to the study of seismic wave propagation which in turns helps improving our understanding of the physical processes behind the sources and our knowledge of the propagation medium. The objective of this thesis is to further develop signal processing techniques to more fully exploit the information brought by the 3 component stations and arrays in order to characterize the seismic wavefield. The thesis work focuses on polarization analysis, its extension to 3-component arrays and its joint use with classical array processing. A review of the existing methods that attempt to extend array processing to the 3-components leads to the observation that these methods are complex and their use is limited. Therefore, two alternative methods that associate array processing and polarization sequentially are suggested. In order to best exploit the polarization analyses, a standardized parametrization system describing the polarization is developed and associated with a visualization solution regrouping all the parameters necessary for the interpretation on one figure. Finally, a polarization analysis performed on data from the LSBB 3-component array demonstrates the possibility to use spatial coherency to assist with the interpretation of seismograms
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https://tel.archives-ouvertes.fr/tel-01489485
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Submitted on : Tuesday, March 14, 2017 - 2:35:08 PM
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  • HAL Id : tel-01489485, version 1

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Claire Labonne. Analyse de la polarisation de données multi-composantes à partir d'une seule station ou d'une antenne : méthodes et applications à la caractérisation du champ d'ondes sismiques. Sciences de la Terre. Université Côte d'Azur, 2016. Français. ⟨NNT : 2016AZUR4135⟩. ⟨tel-01489485⟩

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