Multidisciplinary study of the Torrio landslide (Northern Apennines, Italy).

The multidisciplinary approach (geological and geomorphological studies, structural analysis, geoelectrical and seismic surveys, borehole data) utilized in this research allowed the definition of a reliable geological model of the Torrio landslide, one of the largest mass movements of the whole Northern Apennines occurring in the Aveto valley (Emilia-Romagna Region) and that determined the inclusion of the Torrio old villages in the "List of inhabited centres to be transferred". The results indicate that the Torrio megalandslide is actually composed by three superposed main landslide bodies characterized by different genetic mechanisms, timing of emplacement and state of activity, but all showing deep sliding surfaces (from 30-40 m up to 250 m). This study represents a considerable improvement for the objective of achieving the landslide risk assessment mapping of the territory surrounding the Torrio inhabited centre, according to the Emilia-Romagna Region legislation.