GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 fault between the Pazarcık and Erkenek segments, and the Pütürge segment located between the previous 2020 Elaziğ seismic sequence and the north-eastern terminaton of the 2023 earthquake sequence. The coseismic slip model on the preferred fault network geometry shows the actvaton of diferent fault segments during the 2023 Kahramanmaraş seismic sequence. In partcular, the M W 7.8 earthquake ruptured the Amanos segment to the south and the Pazarcık and Erkenek segment to the north (for a total length of about 300 km), in agreement with previous studies (e.g. Barbot et al., 2023), with litle slip resolved along the Narlı segment where the mainshock nucleated (Melgar et al., 2023). The maximum slip is observed along the Pazarcık segment (peak slip of about 10 m). In contrast, the geodetc modelling of the M W 7.6 earthquake, nucleated in the middle of the E-W trending Çardak-Savrun fault and propagated westward to the Savrun fault and eastward along the Nurhak complexity, indicated a more localized rupture primarily within the Çardak- Savrun segment (for a total length of about 150 km), with up to 15 m of slip. Finally, at the southern terminaton of the mainshock rupture, our modelling revealed that the 20 February M W 6.4 afershock actvated the Antakya fault. Including the 2020 Elaziğ and 1971 Bingöl sequences, most of the EAFZ has been recently reactvated; similarly considering the well-known XX century earthquakes succession that reactvated the NAFZ (Stein et al., 1997), within the broader regional scale fault system associated to the lithospheric Arabia indenter, the N-S Dead Sea Trasform fault system could possibly be the focus of future ruptures.