Abstract.
New geoelectrical techniques have been applied to the study of the Giarrossa landslide in the Lucano Appennines of southern Italy. Dipole–dipole electrical resistivity tomographies (ERT) and self-potential (SP) surveys were carried out using innovative techniques for data acquisition and inversion. The ERT showed the presence of a conductive zone at a depth of about 25–35 m associated with the landslide body and some shallow high-resistivity nuclei associated with intercalations (calcilutitic, calcarenitic blocks, etc.) in the disturbed material. Two SP areal surveys, undertaken after the winter and summer seasons, highlighted equipotential contours following the landslide boundary and an electrical field predominantly negative in the source zone and positive in the accumulation zone.
Résumé.
De nouvelles techniques géo-électriques ont appliquées pour l'étude du glissement de Giarrossa dans les Apennins de Lucanie du sud de l'Italie. Des tomographies de résistivités électriques méthode dipôle–dipôle (ERT) et des prospections électriques par la méthode de polarisation spontanée (SP) ont été mises en œuvre, utilisant de nouvelles techniques pour l'acquisition et l'inversion des données. La méthode ERT a montré la présence de zones conductrices à des profondeurs d'environ 25–35 m en rapport avec le corps du glissement et d'un noyau peu profond, de forte résistivité, en rapport avec des intercalations (blocs de calcilutite et de calcarénite) dans le matériau remanié. Deux prospections SP, réalisées après l'hiver et l'été, ont permis de mettre en évidence par des lignes équipotentielles les limites du glissement ainsi qu'un champ électrique principalement négatif dans la zone source et positif dans la zone d'accumulation.
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This work has been financially supported by MURST (Ministry for University and Scientific and Technological Research).
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Lapenna, V., Lorenzo, P., Perrone, A. et al. High-resolution geoelectrical tomographies in the study of Giarrossa landslide (southern Italy). Bull Eng Geol Environ 62, 259–268 (2003). https://doi.org/10.1007/s10064-002-0184-z
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DOI: https://doi.org/10.1007/s10064-002-0184-z