GNGTS 2013 - Atti del 32° Convegno Nazionale

separating the sector surrounding the littoral of the southern Latium-northern Campania, characterized by active depositional processes, from the littoral to the south of the Neapolitan area, dominated by the interaction accumulation-erosion. The sea bottoms ranging among 0 to 30 m of water depth are characterized as the natural geologic and geomorphologic prosecution of the emerged coastal belt. These sectors show morphologic and structural analogies, more than lithologic affinities. The flooding of significant parts of the Italian coasts occurred during recent epochs (post-glacial); moreover, in the Campania area repeated phases of sub-aerial exposure due to tectonic and volcanic setting occurred. A first control on the physiography, structure and evolution of the sea bottoms is due to the coastal typology. It results perhaps evident that a morphologic and morpho-structural reconstruction of these sectors starts from the characteristics related to the sectors of emerged coasts. The Procida island and the S. Margherita promontory are characterized mainly by high relief coastal cliffs; they represent emerged coastal cliffs, mainly active, extended into the submerged portion with their natural continuity (Ispra, 2011). In particular, the Procida Island is characterized by high sub-vertical coastal cliffs observed along tracts of coasts which, in the north-eastern sector, are the tract among Punta della Lingua and Punta dei Monaci and in the south-eastern sector, the Punta Pizzaco promontory and the Santa Margherita promontory. High coastal cliffs, having gradients ranging between 30° and 40° characterize the coasts of Solchiaro located to the south-east and Punta Pizzaco (Ispra, 2011). The remnant sectors of the shoreline are occupied by narrow sandy belts, surrounded by inactive coastal cliffs, such as in the Chiaia Bay (Procida), where the coastal cliff shows a slightly bent shape, separated by a submerged structural high, which divides the bay into two bays; in the rectilinear coast between Ciraccio and Ciracciello and in the bay from the Punta Serra and Punta Ottimo promontories. The Vivara inlet is distinguished from high coasts directly exposed to the sea erosion. The inner and outer slopes of the crater are very steep, having steepness of more than 40°. The Fig. 2 – Three-dimensional reconstruction of the Naples Bay and Ischia offshore constructed through Multibeam bathymetry. The main morpho-structural lineaments have also been indicated.. 179 GNGTS 2013 S essione 3.3