The investigations carried out in the Petit Mont Rouge and Lapires talus slopes were funded by the Swiss National Science Foundation (SNF) (project No. thesis of Cristian Scapozza performed at the University of Lausanne. The investigations carried out in the Swiss RhГґne Valley are part of the Ph.D. thesis of Laetitia Laigre at the University of Lausanne, under the supervision of Prof.

The ERT data for the Cimadera landslide are reported with the permission of the Ufficio dei pericoli naturali, degli incendi e dei progetti of the public administration of the Canton of Ticino. A special thanks to all those who helped in the fieldwork, to Prof. Emmanuel Reynard for the comments on a first version of the manuscript, and to the anonymous reviewers. IntroductionДЎFor the last three decades, geophysical prospecting remarkably increased in geomorphological researches (Schrott and Sass, 2008). For a long time, studies of geomorphological landforms were carried out from direct observation of internal structure visible in outcrops or obtained by diggings and corings, thus in a one-dimension. With the technological improvements like light-weighted materials, a change in the practice of geomorphological investigations was noted thanks to the integration of the geophysical approach (Schrott et al., 2003).

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