Rockfall susceptibility map for Athinios port, Santorini Island, Greece

This article analyzes rockfall susceptibility in the steep caldera slopes upstream of Athinios port, Santorini Island, Greece. The study area is situated in the internal rim of a submarine caldera where the most important problem that is recorded is the frequent rockfalls that not only cause damages to roads and vehicles but also pose a threat to people that are transported or located on the port. As a result, a methodology which combines information relatively to surficial and engineering geology, geomorphological processes, and structural analysis was adopted. The methodology incorporates evenly a maximum runout map generated by means of reach probability of rock block analysis, using the empirical model of “reach angle”. Additionally volumes of rockfall events categorized and presented through a map to assist the compilation of rockfall susceptibility map which allows us to identify areas and human activities exposed to these incidents and set up several protection meters.