Geological models and triggering mechanisms of slide-flows in the volcaniclastic deposits of Campania region (Italy)

The main factors which predispose and eventually can trigger slide-flows in the Campanian volcaniclastic deposits are here analyzed, with reference to two geological-geomorphological settings (carbonate hills, Phlegraean Fields), frequently affected by such landslides in the last decade. Based upon a thorough stratigraphical and geomorphological survey, the role played by factors such as pumice layers, mountain roads, groundwater circulation, etc., is related to the features of some Campanian landslides occurred from 1996 onward. Basic differences between the Phlegraean (Naples, Ischia island) and the peri-Vesuvian (Pizzo d'Alvano, Penisola Sorrentina - Lattari Mts., Mt. Fellino) landslides have been noticed; in the latter setting, in fact, the structure of the volcanic sequence is fundamental, while in the Phlegraean district weathering of the pyroclastic sediments favours the detachments and their repeated occurrence. Eventually a good agreement is found between the main results here achieved and the recentmost specific literature.