GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Insights on the (in)activity of the western Crati fault (Calabria) P. Galli 1,2 , F. Muto 3 , G. Naso 1 , E. Peronace 2 , G. Robustelli 3 1 Dipartimento Protezione Civile, Roma 2 CNR-IGAG, Roma 3 Dipartimento Biologia, Ecologia e Scienze della Terra, Cosenza Introduction The Crati Basin occupies a half-Graben that opened along ~NNW-SSE Plio-Quaternary normal faults. These separate Late Miocene-Quaternary deposits from the Paleozoic crystalline and metamorphic rocks along both the Coastal Range and Sila Massif (Lanzafame & Tortorici, 1981). In the depocentral area of the Crati Basin, these deposits are made by a Piacenzian-Middle Pleistocene conglomerate-arenites and sand-clay marine succession, topped by Late Pleistocene and Holocene alluvial deposits. The half-Graben master fault bounds the western side of the basin (e.g. in Brozzetti et al., 2017), running along the eastern slopes of the Coastal Range, where it shows planar straight slopes and sharp scarps in the footwall mountain range, as well as triangular and trapezoidal facets (San Marco Argentano-San Fili fault. MFF in Fig. 1). A structurally-controlled drainage network flows perpendicular to the fault system, with entrenched valleys in the rocky footwall and flat-bottomed reaches in the sandy-clayey deposits of the hanging-wall. The MFF shows sparse slickensides striking N-S to NNE-SSW, with subvertical to oblique striae indicating a right-lateral component of motion related to a N125E extensional (e.g. in Cifelli et al., 2007; Tansi et al., 2007; Spina et al., 2009; Pepe et al., 2010).