GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Fault (re)actvaton, fuid-induced seismic actvity and seismogenic potental in the Val d’Agri (southern Italy). A. Lavecchia 1 , V. Serlenga 2 , M. Filippucci 1,3 , T.A. Stabile 2 , G. Prosser 4 , A. Tallarico 1,3 1 University of Bari, Italy 2 Natonal Research Council of Italy, Insttute of Methodologies for Environmental Analysis, Tito Scalo, Italy 3 Natonal Insttute of Geophysics and Volcanology, Rome, Italy 4 University of Basilicata, Potenza, Italy The Val d’Agri is one of the regions around the globe where the relatonship between fuids and earthquakes has been suggested. In this basin, wastewater reinjecton led to the reactvaton of the Costa Molina blind fault and the generaton of a microearthquakes cluster. In additon, another cluster is observed within the basin and is related to seasonal variatons of the Pertusillo Lake. The factors that led to the generaton and reactvaton of the fault systems responsible for both the Costa Molina and Pertusillo seismic clusters are stll a mater of debate. Consequently, the characteristcs of the seismic potental in the basin is largely uncertain. Therefore, we have built a 2D thermo-mechanical model to address the main mechanisms promotng the present-day tectonic setng of the Val d’Agri and assess the seismic hazard in the basin. Our fndings suggest that deformaton is mostly led by mechanisms of thin-skinned tectonics and the Burano Formaton acts as a décollement layer between the sedimentary cover and the crystalline basement. Based on the quantfcaton of the stress feld in the region and estmatons of the crust’s Coulomb stress values, we suggest that the Val d’Agri sedimentary cover is characterized by a high seismic hazard, and therefore a careful approach is advisable when fuids injecton and storage actvites are programmed. Corresponding author: alessio.lavecchia@uniba.it