GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 ___ GNGTS 2023 Near Surface Geophysics Contribution For First Level Seismic Microzonation Studies For The Municipality Of san Vito Lo Capo, Western Sicily, Italy A. Canzoneri, A. Bonfardeci, P. Capizzi, R. Martorana Università di Palermo, Dipartimento di Scienze della Terra e del Mare, Palermo, Italy Introduction Recent studies, carried out by the University of Palermo, allowed to define different seismic aspects of the area of San Vito Lo Capo, located in the north-western Sicily, Italy. These investigations were helpful to recognize and highlight, on a sufficiently detailed scale, the lithostratigraphic and morphological characteristics of the study area. Moreover, this approach has a particular importance in understanding which features could induce seismic shaking amplification episodes, instability phenomena and earthquake-triggered permanent deformation. These analyses underlie the Seismic microzonation (SM) of an area, which represents a useful tool for seismic prevention and risk assessment. The first level SM studies, applied to the Municipality of San Vito Lo Capo, has been based on the collection and analysis of pre-existing data and integrated by new in situ investigations. Finally, the interpretation and correlation of these data allowed to identify seismic bedrock depth and the homogeneous microzones from a seismic perspective (MOPS). Geological and geomorphological setting The area belonging to the Municipality of San Vito Lo Capo is located on the north-western coast of Sicily and extends from the promontory of Capo San Vito, to the north, to the village of Castelluzzo and the Zingaro natural reserve to the west and east respectively. The geological lithotypes that characterize the area are limestone and recent clastic-terrigenous terrains. Morphologically the area is characterized by a main contrast between mountains (Monte Monaco - Pizzo di Sella ridge) and flat and tabular areas hosting San Vito town and Macari and Castelluzzo villages. The mountain reliefs are characterized by several slope breaks, steep slopes and