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Étude de mouvements de terrain par méthodes géophysiques

Abstract : Understanding and forecasting landslides evolution could be improved by more quantitative information about their 3D geometry, their damage state and preferential fluid flow. The aim of this thesis wich is methodological and axperimental, is to perform a critical study of advantages and limits of different geophysical technics (Electrical tomography, seismic methods, seismic noise treatment and self-polarisation measurements) to characterize landslides.

We performed geophysical studies on five test sites, three in rocky context (Séchilienne in Isère, La Clapière in Alpes Maritimes and Ravin de l'Aiguille in Isère) and two in shale context (Super Sauze in Alpes de Hautes Provence and Léaz in Ain). We show that, thanks to the remaniement degree, geophysical parameters such as $\rho$ (electrical tomography), $V_P$ (seismic refraction and tomography) and $V_S$ (seismic refraction and surface wave analysis) could allow to characterize the movement shape. For surface wave analysis, we recommend constrained the parametrization with $V_P$ if it is known at surface and with the frequency peak of H/V. Furthermore, for regular shape and low lateral gradient in $V_S$, we show that the H/V method could help to obtain quickly quantitative information on spatial variation of substratum geometry.

Finally, we deployed an non-polarizable elctrodes network to monitor self-potential variations on the Séchilienne mass movement. This network allowed to point out preferential fluid flow path inside the mass and their complexity.
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Contributor : Ombeline Meric <>
Submitted on : Monday, June 2, 2008 - 2:44:03 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
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  • HAL Id : tel-00284215, version 1



Ombeline Meric. Étude de mouvements de terrain par méthodes géophysiques. Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00284215⟩



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