GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Interplay Between Fault Ruptures and Man- Made Structures Related With the 2023 Mw 7.8 and 7.5 Turkey Earthquakes T. Volatli 1 , A. Dall’Asta 2 , S. Mazzoli 1 , F. Micozzi 2 , F. Stmilli 1 , G. Valentni 1 , M. Tümay 3 , B. Aksay 3 , A. Beycioğlu 3 , E. Tondi 1, 4 1 School of Science and Technology – Geology Division, University of Camerino, Italy 2 School of Architecture and Design, University of Camerino, Italy 3 Adana Alparslan Türkeş Science and Technology University, Turkey 4 Natonal Insttute of Geophysics and Volcanology, Seismology and Tectonophysics Division, Camerino, Italy The February 6, 2023, earthquake twins, Mw 7.8 and 7.5, which struck Turkey and Syria on February stmulated scientfc research on their geological and societal implicatons. Such destructve events, causing ca. 60’000 confrmed casualtes, according to the Disaster and Emergency Management Authority (AFAD), was triggered by the partal re-actvaton of the Eastern Anatolian fault. Specifcally, the southernmost segment of this lef-lateral strike-slip structure produced fault ruptures at surface extending for ca. 500 km. Most of such fault expressions, clearly observable even from satellite images, were mapped soon afer the mainshocks (Mai et al., 2023; Reitman et al., 2023). The present study delved into the afermath of this seismic upheaval: in 7 days of intense feld survey (from 04/07/23 to 10/07/23), a total of 334 fault records were collected (Fig. 1) employing a multfaceted approach that combined traditonal structural geology surveys with aero photogrammetric techniques. Covering the whole extent of the fault rupture at the surface, this research aimed to elucidate the manifold efects of surface faultng on both natural landscapes and human-built infrastructures and setlements. Through metculous structural geology surveys, the study catalogued the surface manifestatons of the fault rupture, providing insights into the characteristcs and behaviours of the ruptured fault segments. This in-depth analysis facilitated a comprehensive understanding of fault dynamics and their implicatons for seismic hazard assessments in the region. Moreover, the integraton of aero photogrammetric surveys signifcantly expanded the scope and precision of the investgaton. High- resoluton aerial imagery enabled detailed mapping and three-dimensional reconstructon of fault rupture in key-zones. This comprehensive visualizaton proved instrumental in discerning fault displacement paterns and delineatng the most susceptble areas to seismic actvity.