GNGTS 2013 - Atti del 32° Convegno Nazionale

Pleistocene, only the south-westernmost part of the Veneto-Friuli foredeep (southern part of the Veneto Basin) bent towards SW due to the Northern Apennines build up (Fantoni et al., 2002). Seismic interpretation. The Landmark software was used to digitise the seismic horizon of the intra-Messinian Unconformity (corresponding to the Pliocene base) in Two Way Travel time (TWT) domain (Fig. 1). This horizon records the last deformational phase (Pliocene- Pleistocene) affecting the Veneto-Friuli foredeep. Several TWT variations are observed and interpreted as related to faults that accommodated the Pliocene-Pleistocene flexural phase. The depicted network of fault segments was subsequently imported and analysed by a GIS software to map the whole system. Seven seismic sections (Tab. 1; Fig. 2) sub-orthogonal to the western margin of the Veneto- Friuli foredeep were depth converted. Stratigraphic horizons from the Upper Trias to the Pleistocene were recognised (Fig. 2) and deep exploration wells, located close to the lines (Tab. 1), were used to calibrate the interpretation. The use of a GIS software has allowed conversion of the seismic section from the time-domain to the depth-domain. Fig. 1 – Map of the Upper Messinian unconformity (Pliocene base) performed using the seismic sections database and carried on in the time domain (TWT). A sharp colour transition evidence a TWT/depth variation of the horizon interpreted as linked to a fault. Three main faults composing the Schio-Vicenza fault system are evidenced: the Schio–Vicenza fault (SV) to the NW, the Travettore–Codevigo fault (TC) to the E and the Conselve–Pomposa fault (CP) to the SW. Inset: simplified structural map of the eastern Southern Alps (modified from Zampieri et al. , 2003). 187 GNGTS 2013 S ESSIONE 1.2