Caractérisation de la structure interne et de l'état hydrique de glissements argilo-marneux par tomographie géophysique : l'exemple du glissement-coulée de Super-Sauze (Alpes du Sud,France) |
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| Authors: | Gilles Grandjean Céline Pennetier Adnan Bitri Ombeline Meric Jean-Philippe Malet |
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| Institution: | 1. Bureau de recherches géologiques et minières (BRGM), Aménagement et risques naturels, BP 6009, 45060 Orléans, France;2. Institut de physique du globe de Paris, 4, place Jussieu, 75252 Paris cedex 05, France;3. Laboratoire interdisciplinaire de recherche impliquant la géologie et la mécanique (LIRIGM), Maison des Géosciences, BP 53, 38041 Grenoble cedex 9, France;4. Faculty of Geosciences, UCEL, University of Utrecht, P.O. Box 80.115, 3508 TC Utrecht, The Netherlands |
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| Abstract: | Geophysical methods such as seismic surveying and electrical resistivity imaging appear to be well-adapted to investigate and understand landslide mechanisms. They allow direct and non-intrusive measurement of acoustic velocity and electrical resistivity, two fundamental parameters used to define the physical properties of the reworked moving materials. Both methods were applied at the Super-Sauze site in the French South Alps, where a typical example of an intra-material earthflow-mudslide can be observed. Measurements were taken simultaneously along two orthogonal profiles: one 325 m in length is perpendicular to the axis of the earthflow; the other 235 m in length is located along the axis of the earthflow. The results show a correlation between the seismic and electrical resistivity data, confirming that the simultaneous use of both methods gives complementary information about landslide mechanisms. The seismic data provide information on fracture density variations, whereas the electrical resistivity data provide information on water content variations. To cite this article: G. Grandjean et al., C. R. Geoscience 338 (2006). |
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| Keywords: | Glissement de terrain Géophysique Tomographie Sismique Méthodes électriques Alpes du Sud France Landslide Geophysics Tomography Seismic survey Electrical methods South Alps France |
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