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<dc:title xml:lang="fr">Conversions sismo-électromagnétiques en milieux poreux.</dc:title>
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<dc:subject xml:lang="fr">Géophysique de proche surface</dc:subject>
<dc:subject xml:lang="fr">Signaux sismo-électromagnétiques</dc:subject>
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<dc:subject xml:lang="fr">Sismologie</dc:subject>
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<tef:elementdEntree autoriteExterne="027355217" autoriteSource="Sudoc">Matériaux poreux</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Cette thèse s'attache à la compréhension des phénomènes de couplages sismo-électromagnétiques survenant dans des milieux poreux contenant des fluides, ainsi qu'au développement de méthodes d'imagerie géophysique basées sur ces conversions. Deux axes de travail sont investigués. Le premier concerne le traitement des données sismo-électromagnétiques et notamment l'extraction des réponses interfaciales, qui peuvent renseigner sur le sous-sol en profondeur. Nous comparons l'impact de plusieurs méthodes de filtrage sur les amplitudes et les formes d'onde de ces réponses, dont une nouvelle technique de filtrage en domaine des curvelets, qui s'appuie sur les similarités entre les données sismiques et cosismiques. D'autre part, nous étendons la théorie de la propagation couplée des ondes sismiques et électromagnétiques à des milieux partiellement saturés pour le cas d'un mélange air/eau. Nous adaptons un programme de simulation numérique des ondes sismo-électromagnétiques à ces conditions.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis aims to improve our understanding of seismo-electromagnetic coupling phenomena occuring in fluid-containing porous media and to develop geophysical imaging techniques based on conversions.Two areas of work are explored. The first encompasses seismoelectromagnetic data processing, especially the extraction of interface responses, which may provide information about the subsurface at depth. We compare the influence of several filtering techniques on the amplitudes and waveforms of the interface responses, among which a new filtering technique in the curvelet domain, taking advantage of the similarity between seismic and coseismic data. Furthermore, we extend the theory for the coupled propagation of seismic and electromagnetic waves here to partially saturated media for the case of a water/air mixture. We adapt a seismoelectromagnetic wave modelling program to these conditions.</dcterms:abstract>
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