Rockfall and sustainable development in the Sorrento-Amalfi peninsula

Based on an inventory of 721 rock landslides happened in the time span between 1899 and 2019 (120 years), the rockfall susceptibility affecting the Sorrento-Amalfi Peninsula has been evaluated. Both wide rock landslides (e.g.: Amalfi 1899, M. Catiello 2002) and small movements involving cliffs only a few hundred square meters wide, affect this area. Landslide data from different sources (IFFI Catalogue, bibliography, newspapers, websites, and onsite surveys) were processed to obtain the areal rockfall density (number of landslides/km2) of an area of about 303 km2 (including Capri), divided into 33 municipal territories. Also, the linear densities (number of landslides/km) for the two main state roads crossing the region (no. 163 Amalfitana and no. 145 Sorrentina), and coastline were evaluated. Even though there were an incomplete information concerning many failures, it was possible to draw susceptibility maps, the contents of which are explained and commented below. These maps can be considered useful tools for promoting the sustainable development of the area.