GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.1 GNGTS 2023 Structural setting, active tectonics, 3D crustal model and shaking scenarios in the Crotone offshore (Calabria, Southern Italy) within the “H&RA-Lacinia project” I. Molinari 1 , L. Lipparini 2 , G. Sgattoni 1 , L. Faenza 1 , A. Argnani 3 , M. Rovere 3 , A. Morelli 1 , D. Di Bucci 4 , I. Antoncecchi 5 1. Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Bologna, Bologna, Italy 2. Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Roma 1, Roma, Italy 3. ISMAR – CNR, Bologna, Italy 4. Dipartimento della Protezione Civile, Roma, Italy 5. Ministero dell'Ambiente e della Sicurezza Energetica, Roma, Italy We present the results of our contribution to the “H&RA-Lacinia project” funded by the Italian Ministry of Environment and Energy Security and aimed at developing a methodology to study natural hazards, with which offshore production activities can potentially interfere. In this framework, the area offshore Crotone (Ionian Calabria coast, Southern Italy) has been chosen as a test site. The Calabrian accretionary prism is the result of a complex interaction between subduction-related tectonics and sedimentation, active since the Eocene. The limited seismicity recorded in recent years in the area appears mostly associated to the subduction interface and could reflect either a weak subduction coupling or a slow subduction rate. Nevertheless, recent intense deformation and uplift of the seafloor has been observed within the accretionary prism. We designed a workflow that, starting from the collection of all data available for the region lead to the interpretation of the tectonic features and active faults, to the construction of a 3D crustal geological and velocity model of the region and finally to the numerical simulations of 3D seismic shaking scenarios. The analysis of multichannel 2D and high-quality 3D seismic data, morpho-bathymetric data, instrumental seismicity, wells with stratigraphic and velocity information, etc., allowed defining and characterizing both the shallower and deeper tectonic features characterizing this sector of the Calabrian accretionary prism. Besides the uppermost thrust fault of the Calabrian accretionary prism, that outlines the Crotone promontory, the shallow tectonic pattern of the prism is characterized by a belt of broad flat-topped anticlines, and a set of minor narrow structures,