GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 earthquakes of 1976. Besides, the well-defined seismic volume activated during the 1976 earthquakes is confined towards the North and the East by the Idrija-Ampezzo and Predjama Fault Systems, respectively, highlighting that the dextral strike-slip fault systems play a fundamental role in the definition of the seismic volume of the area and strongly control seismogenesis. Fig. 1. Seismotectonic map of the Friuli region and western Slovenia. Focal mechanisms from Saraò et al. (2021). Historical seismicity from CPTI15 v4.0 (Rovida et al., 2022) (red stars) and from CFTI5 MED (Guidoboni et al., 2019) (green stars). Instrumental seismicity: 1976/05/06 Mw 6.5 (yellow circle) from Slejko (2018); 1976–1977 from Rebez et al. (2018) and 1978–2019 from OGS-CRS Friuli Venezia Giulia Seismometric Network Bulletin. Faults acronyms: AR: Arba–Ragogna Thrust; BFC: Borgo Faris–Cividale Fault; FS: Fella Sava Ft.; GK: Gemona–Kobarid Th.; IA: Idrija–Ampezzo Ft. MV: Musi–Verzegnis Th.; POZ: Pozzuolo Th.; PRJ: Predjama Ft.; RA: Ravne Ft.; RS: Ra š a Ft.; ST: Susans–Tricesimo Th.; TN: Trnovo Th.; TZ: Terenzano Th.; UB: Udine–Buttrio Th. (Patricelli et al., 2022).