GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.2 203 Falcucci E., Poli M.E., Galadini F., Scardia G., Paiero G. & Zanferrari A.; 2018: First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy. Insight on the 1511 earthquake seismotectonics . Solid Earth Discussions, 1-16. DOI 10.5194/se-2017-131. Galadini F., Poli M.E., Zanferrari A.; 2005: Seismogenic sources potentially responsible for earthquakes with M≥6 in the eastern Southern Alps (Thiene-Udine sector, NE Italy). Geophys. J. Int., 161 , 739-762. Poli M.E.; Zanferrari A.; 2018: The seismogenic sources of the 1976 Friuli earthquakes: a new seismotectonic model for the Friuli area. DOI: 10.4430/bgta0209. Rovida A., Locati M., Camassi R., Lolli B. & Gasperini P. (eds); 2016: CPTI15, the 2015 version of the Parametric Catalogue of Italian Earthquakes . Istituto Nazionale di Geofisica e Vulcanologia. DOI http://doi.org/10.6092/ INGV.IT -CPTI15. Serpelloni E., Vannucci G., Anderlini L. & Bennett R.A.; 2016: Kinematics, seismotectonics and seismic potential of the eastern sector of the European Alps from GPS and seismic deformation data . Tectonophysics, 688 , 157-181. DOI http://dx.doi.org/10.1016/j.tecto.2016.09.026. Zanferrari A., Avigliano R., Monegato G., Paiero G., Poli M.E., Stefani C.; 2008: Geological map and explanatory notes of the Geological Map of Italy at the scale 1:50.000: sheet 066 “Udine”. APAT – Servizio Geologico d’Italia – Regione Autonoma Friuli Venezia Giulia, 176 pp., <www.isprambiente.gov.it/Media/carg/friuli.html >. ACTIVE LANDSCAPE RESPONSE TO HALF-ELLIPTICAL TECTONIC DEFORMATION: SOUTHEASTERN HYBLEAN PLATEAU (SE-SICILY, ITALY) F. Pavano 1 , G. Romagnoli 2 , G. Tortorici 1 , S. Catalano 1 1 University of Catania, Department of Biological, Geological and Environmental Sciences, Catania, Italy 2 Consiglio Nazionale delle Ricerche, Istituto di Geologia Ambientale e Geoingegneria, Montelibretti (RM), Italy The recognition of active faults within a regional-scale fault belt represents a crucial challenge to define active crustal deformation and to outline the strain partitioning processes. As demonstrated by several studies in the last decades, the geomorphic features of a landscape represent the surficial expression of the relief-building endogenous processes, enabling to define the tectonic deformation distribution, the fault activity and its geometry, contributing significantly to the general seismic and hydrogeological risk assessment of a region. The present study provides geomorphic evidences of active landscape response to tectonic disturbance along the southeastern border of the Hyblean Plateau (SE-Sicily - Italy) (Fig. 1). This latter is located at the African-European convergent plate boundary and it was affected by high-level historical seismicity (e.g. 1693 seismic event - Postpischl, 1985; Boschi et al. , 1995). The Hyblean region is composed of distinct Quaternary crustal blocks (Catalano et al. , 2010) that derive from the fragmentation of the Late Miocene-Pliocene foreland bulge of the Sicilian orogenic belt (Ben Avraham et al., 1990). During the Quaternary, the low-amplitude flexuring of the Hyblean continental crust related to the NNW-SSE oriented Nubia-Eurasia convergence, determined the development of NE-SW-oriented extensional faulting (e.g. Scordia-Lentini Basin; S.L.B. in Fig. 1), accommodated along a regional N10-oriented, right-lateral transform fault zone (Scicli Line; S.L. in Fig. 1) (Ghisetti and Vezzani, 1980; Catalano et al. , 2008). Since the Middle Pleistocene (<850 ka), a generalised positive tectonic inversion caused the remobilisation of these main fault systems, resulting in the progressive NW-ward migration and emergence of the eastern sectors of the Hyblean Plateau (Fig. 1) (Catalano et al. , 2010). This Late Quaternary mobile crustal block is bounded, to the northwest by the inverted border faults of the Scordia-Lentini Basin (e.g. Pedagaggi-Agnone System; Fig. 1), to the northeast by the active dextral faults in the Ionian off-shore (Bianca et al. , 1999; Polonia et al. , 2011) and to the west by the inverted left-lateral Scicli Line (Fig. 1). At the southeastern counterpart the Hyblean kinematic block is controlled by the NE-SW oriented Ispica Fault (I.F. in Fig. 1) and Avola Fault (Catalano et al., 2008), this latter representing our study area.