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Modélisation physique à échelle réduite pour l'adaptation de l'inversion des formes d'ondes sismiques au génie civil et à la subsurface.

Abstract : Full Wave Inversion (FWI) is a multiparameter quantitative method of seismic imaging that is currently booming. Taking into account all propagation phenomena recorded, especially the surface waves, makes it a promising technique for near surface applications on geotechnical and environmental issues. However, adapting a seismic method validated on synthetic data to the context of near surface or on deep imaging applications remains a difficult task. What we are proposing here is a reduced scale physical modelling approach using a laboratory of non contact laser-ultrasonic measurement, which will have been set up as part of this thesis. The various elements of the laboratory were validated for reduced scale seismic modelling, and particular attention has been paid to the simulation of the source. The acquired data has been validated by comparison with data obtained by numerical modelling using algorithmes provided by Géoazur within the context of the ANR SEISCOPE project. In a second step, we evaluated the potential of the use of FWI for near surface applications by using a joint approach of numerical modelling and experimental modelling. By this dual approach, we have thus shown that FWI allows to obtain information on the morphology of underground cavities by taking into account surface waves. Furthermore, on the various multilayer models we studied, the FWI was able to exploit the information on the most superficial areas supplied by dispersive surface waves.
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https://tel.archives-ouvertes.fr/tel-00730540
Contributor : François Bretaudeau <>
Submitted on : Monday, September 10, 2012 - 3:33:18 PM
Last modification on : Friday, July 17, 2020 - 5:08:27 PM
Long-term archiving on: : Friday, December 16, 2016 - 11:36:43 AM

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  • HAL Id : tel-00730540, version 1

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François Bretaudeau. Modélisation physique à échelle réduite pour l'adaptation de l'inversion des formes d'ondes sismiques au génie civil et à la subsurface.. Géophysique [physics.geo-ph]. Université de Nantes, 2010. Français. ⟨tel-00730540⟩

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