GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Multdisciplinary analysis of 3D seismotectonic modelling: a case study of Serre and Citanova faults in Southern Calabrian Arc (Italy). S. Giufrida 1* , F. Brighent 1-4 , F. Cannavò 3 , F. Carnemolla 1-2 , G. De Guidi 1-2 , G. Barreca 1-2 , S. Gambino 1 , G. Barberi 3 , L. Scarf 3 , C. Monaco 1-2-3 1 Department of Biological, Geological and Environmental Sciences, University of Catania, Italy. 2 CRUST-Interuniversity Center for 3D Seismotectonics with territorial applicatons. U.R. Catania, Italy. 3 INGV-OE, Natonal Insttute of Geophysics and Volcanology-Etnean Observatory, Catania, Italy. 4 Department of Physics and Earth Sciences, University of Ferrara, Italy. Introducton The Calabrian Arc (CA hereinafer), in Southern Italy (Figure 1a,b,c), is an actve structural domain where high-intensity historical and instrumental earthquakes with magnitude higher than 7 were recorded. In partcular, some earthquakes in southern Calabria such as the seismic sequence of 1783, with the mainshock on February 5 (M 6.9–7.1; Jacques et al., 2001 (Figure 1a) have been regarded as the strongest seismic events of the Italian Peninsula. The seismogenic sources of major earthquakes occurred in the area are stll debated, for instance, diferent interpretatons were proposed regarding the locaton and the geometries of the causatve faults responsible for the 1783 historical seismic sequence. In this work, a multdisciplinary approach has been followed to reconstruct, in the MOVE Sofware Suite environment (granted by Petroleum Experts Limited; www.petex.com) , the 3D geometry of the Citanova fault (CF) and Serre fault (SRF), the longest tectonic structures occurring in southern Calabria. These faults, belonging to the A2 category of the DISS (Database of Individual Seismogenic sources, htps://diss.ingv.it/) (Fig.1 a), are defned by Jacques et al. (2001) and recently, startng from macroseismic data, by Andrenacci et al. (2023) as the seismogenic sources of the 5 and 7 February 1783 seismic events, whereas other authors (e.g., Cucci et al., 1996 and reference therein) consider the Gioia Tauro and Mesima faults, belonging to the A1 category, as the most likely sources for the same seismic events. The open debate between diferent geometric interpretatons (E-dipping vs. W-dipping) reported in DISS and diferent schools of thought on the sources of the 1783 seismic sequence proves that the development of a 3D model for these faults may be crucial to beter characterize the seismotectonics of the area and evaluate its seismic potental. Being characterized by clear surface evidence and seismic cluster at depth, we choose the CF and SRF for our analysis.