GNGTS 2019 - Atti del 38° Convegno Nazionale

36 GNGTS 2019 S essione 1.1 SEISMOTECTONIC MODEL OF THE MONTELLO AREA (NORTHEAST ITALY) DERIVED FROM SEISMIC REFLECTION DATA L. Bonini 1,2 , N. Bertone 1 , A. Del Ben 1 , G. Areggi 1 , M. Ponton 1 , G.A. Pini 1 1 Dipartimento di Matematica e Geoscienze, Università di Trieste, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Italy Reconstructing the architecture of active faults at depth is central to understand their earthquake potential. Among others, the geometry of the fault systems and the involved rocks are primary factors affecting the nature of the slip behavior, i.e. seismic or aseismic. In Northern Italy several active faults are hidden by Plio-Quaternary sediments of the alluvial planes bordering the Alps and the Apennines. Over the past 70 years extensive hydrocarbon exploration in these areas has shed light on a number of thrust-faults belonging to the external parts of the Northern Apennines and Southern Alps. Some of these structures produce anticlines well-visible at the topographic surface, such as the Montello hill in Northeast Italy or the San Colombano hill in the Central Po Plain. Others active faults and folds produce weaker effects at surface and their activity can be imaged through morphotectonic studies (e.g. Burrato et al. , 2003). In this study we used seismic reflection data to reconstruct the architectures of the active faults in the Montello area. Then, applying kinematic modelling we calculate their slip rate. Finally, we propose a seismotectonic model speculating on the slip behavior of these faults based on the distribution of the rocks at depth. The Montello hill is an outcropping anticline located at the front of the Neogene- Quaternary Venetian Alps. Three different kind of data suggest that this structure is still tectonically active: 1) Middle and Upper Pleistocene warped river terraces in the western sector (e.g. Benedetti et al. , 2000); 2) a geodetic shortening rate of 1-1.5 mm/yr (e.g. Cheloni et al. , 2014); 3) seismicity (e.g. Romano et al. , 2019). As data to reconstruct active faults in the Montello area, we used seismic reflection profiles and deep wells: some of them are publicly available at the VIDEPI database (http://unmig. Fig. 1 - Tectonic sketch of the Montello and Arcade-Nervesa anticlines and their associated faults (thick red lines).