GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Rheological modelling and seismotectonics of seismogenic sources in the Durres area (Albania) D. Russo 1,2 , M. Maggini 1,2 , R. Caputo 1,2 1 Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy 2 CRUST – UR Ferrara, Ferrara, Italy Keywords: Durres area, BDT, rheology, 3D modelling, seismotectonic Introduction The Durres area along the Albanian sector of the Adria-Eurasia collision was recently affected in 2019 by a seismic sequence with 6.4 as maximum magnitude. This active portion of the accretionary wedge belongs to the outer part of the western Balkan fold-and-thrust belt where the front is kinematically partitioned by the ENE-WSW Shkodra (to the North) and Lushnje (to the South) transfer faults (Fig. 1; Caputo and Pavlides, 2013). In this region the documented seismic activity (Baker et al., 1997; Louvari et al., 2001; Mu ҫ o et al., 1994) is associated to either thrusts and back-thrusts (Aliaj, 2006; Skrami et al., 2001; Velaj et al., 2001; Roure et al., 2004) so that the orientation of the causative source of the 26 November 2019 Durresi mainshock is somehow debated. In order to better characterize the seismogenic sources recognised within the area (Caputo and Pavlides, 2013; DISS Working Group, 2021), we systematically reviewed the seismotectonics of the region and produced a 3D rheological model of the broader crustal volume. The final target was to provide a better constraint for the seismogenic potential. Background From an accurate literature review and by consulting dedicated databases (Caputo and Pavlides, 2013; DISS Working Group, 2021), at least three seismogenic structures were recognized in the investigated sector of the Albanides, either thrusts and backthrusts. These tectonic structures are classified (and properly encoded) in GreDaSS ( Gre ek Da tabase of S eismogenic S ources; Caputo and Pavlides, 2013) as Composite Seismogenic Sources and labelled as ALCSxxx (where xxx is a distinctive number). The geometric (strike, dip, width, minimum and maximum depths) and kinematic (rake) parameters of the 3 investigated sources (Tab. 1) were inferred from a systematic and critical analysis of literature data (Caputo and Pavlides, 2013 and references therein). As