GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Recent advances in the knowledge of the Pollino area crustal structure F. Napolitano 1 , O. Amoroso 1 , L. De Siena 2 , S. Gabrielli 3 , D. Galluzzo 3 , M. La Rocca 4 , R. De Matteis 5 , V. Convertito 3 , P. Capuano 1 1 Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, Fisciano, Italy 2 Institute of Geosciences, Johannes Gutenberg University, Mainz, Germany 3 Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy 4 Dipartimento di Biologia, Ecologia e Scienze della Terra, Rende, Italy 5 Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Benevento, Italy Introduction Detailed knowledge of the crustal properties of geologically complex areas is of fundamental importance for an adequate assessment of the seismic hazard of the area and the consequent implementation of risk mitigation strategies. This is the idea behind the analyses of the Pollino area, which is one of the most tectonically interesting areas of the Southern Apennines, characterized by the largest seismic gap in Italy. Located on the border between Calabria and Basilicata regions in Southern Italy, the area was hit between 2010 and 2014 by a long-lasting seismic sequence with more than 10,000 small-to-medium magnitude earthquakes (max M L 5.0). Seismicity developed across a wider western ellipse-shaped lobe where the main M L 5.0 event occurred and a smaller eastern one comprising a M L 4.3 event. The earthquakes followed a temporal evolution typical of a seismic swarm and, to a lesser extent, of aftershocks following the strongest events (Passarelli et al., 2015). A large delay separated the two main events (M L 4.3 on 28 May 2012, M L 5.0 on 25 October 2012), with the primary event occurring two years after the beginning of the swarm. A slow slip event began about three months before the main shock (Cheloni et al., 2017). The present work aims to provide a multi-parametric image of the seismogenic volume involved in the 2010-2014 Pollino sequence summarizing the results of the most recent analyses performed by the authors. These results considerably improve the knowledge of this important seismic gap area, favoring an adequate evaluation of its possible seismic hazard.