GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 ​ Analysis of recent seismic swarms in the Calabrian Arc G. D. Chiappetta 1 , A. Gervasi 2 , M. Ponte 1 , M. La Rocca 1 1 Università della Calabria, Rende, Italy; 2 Istituto Nazionale di Geofisica e Vulcanologia, Rende, Italy. ​ Introduction Calabria is considered the Italian region with the highest seismic hazard (https://emidius.mi.ingv.it/CPTI15-DBMI15/, http://storing.ingv.it/cfti/cfti5/ ), mainly due to the numerous high intensity earthquakes (MCS>VIII) which occurred in historical times. Recent crustal seismicity, characterized by low-to-medium magnitude earthquakes (M<=5), is irregularly widespread throughout the region and surrounding seas. Some of the main active or presumed active tectonic structures in the Calabrian Arc are known, and many of them have considerable extents, up to tens of kilometers. Frequently, swarms of a few hundred low-magnitude events occur along minor structures, in areas where there isn’t a comprehensive knowledge of the tectonic-structural context. The aim of this work is to study some of the seismic swarms that have occurred in the Calabrian Arc in the last 10 years. In fact, for some of them it has been possible to carry out very detailed analyses thanks to the quantity and quality of available data, despite the maximum magnitude observed is often quite low (M<4). These analyses include absolute location, relative location, computation of the focal mechanism, estimation of the seismogenetic volume, and definition of the geometry of the fault along which the earthquakes of a given swarm occur.