f The contribute of sonic and geoelectrical prospecting techniques in the study of the Giarossa landslide (Southern Italy).

In this work we focus our attention on the Giarrossa landslide, located on Southern Apennine chain close to the western side of Potenza town (Basilicata, Italy) (Fig. 1). In past and recent years this region was interested by many landslides that damaged villages, road systems and relevant engineering buildings. In particular in the investigated area on 5 December 1976 an old and large landslide, ascribed to a rotational slide – earthflow type, was totally reactivated from the main scarp down to the underlying debris layer.