GNGTS 2022 - Atti del 40° Convegno Nazionale

234 GNGTS 2022 Sessione 2.1 SIMULATIONS OF TSUNAMIS INDUCED BY SUBMARINE MASS FAILURES ON THE CALABRIAN IONIAN MARGIN G. Gallotti 1 , F. Zaniboni 1 , A. Armigliato 1 , S. Ceramicola 2 , N. Markezic 2 , C. Angeli 1 , M. Zanetti 1 1 Department of Physics and Astronomy “Augusto Righi” (DIFA), University of Bologna, Bologna, Italy 2 National Institute of Oceanography and Applied Geophysics (OGS), Sgonico, Italy The Calabrian Ionian margin is particularly prone to submarine mass movements, as testified by scars, canyons, deposits at the toe of the escarpment, and relatively high slope angles in the order of 3-8°. In this study, we present numerical investigations of submarine mass failures and of the ensuing tsunamis in one of the largest areas exposing several pieces of evidence of past mass failures. The approximately 100 km 2 Assi region reveals numerous slide deposits, suggesting sliding volumes ranging between 6 Mm 3 and 500 Mm 3 . Numerical simulations of a selection of these slides characterized by distinct features (sliding volumes, detachment depths, and rheology) are performed. As the slides move along the seabed, the impulse given to the water column is estimated and the generation of the waves is reckoned. Eventually, tsunami propagation and inundation are simulated in the near field. We adopt a well-established set of numerical models developed by the Tsunami Research Team of Bologna University. Results prove the strong correlation between the slide characteristics and the generated waves. Local studies of this kind are essential in the investigation of tsunamis generated by submarine failures, whose hazard assessment in the Mediterranean region is still highly debated.