“…The main objectives of geophysical surveys are: (1) geometrical reconstruction of landslide bodies (lateral extension and thickness); (2) identification of sliding surfaces found between the landslide body and the underlying bedrock; and (3) studying the movements and accumulations of groundwater flows that may provoke landslide reactions (McCann and Forster, 1990;Bruno and Marillier, 2000;Gallipoli et al, 2000;Hack, 2000;Mauritsch et al, 2000;Lapenna et al, 2003). Recently, great attention has been focused on geoelectrical techniques, such as electrical resistivity tomography (ERT) (Griffiths and Barker, 1993;Loke and Barker, 1996;Giano et al, 2000;Schmutz et al, 2000) and self-potential (SP) techniques (Bogoslovsky and Ogilvy, 1977;Patella et al, 1995;Bruno et al, 1998;Revil et al, 2002). Both methods show high spatial resolution capability and are characterized by relatively fast field data acquisition and low costs.…”