GNGTS 2013 - Atti del 32° Convegno Nazionale

Results. A deepening of the Pliocene base is observed along all seismic sections moving from the western to the eastern side (Fig. 1). Such variation mainly occurs as a sharp TWT increment (up to 250 ms in the northern part of the study area) within a small distance (200-300 m) and is interpreted as an offset related to fault activity. The faults traces in adjacent seismic sections were joined showing a complex fault system with a NW-SE or NNW-SSE trend. The faults are parallel to the Schio-Vicenza fault and collectively compose the so-called Schio- Vicenza fault system (SVFS) made by three main faults: i) the Schio-Vicenza fault to the NW, extending for about 45 km from the foot of the pre-Alps (Schio) to the north of the Euganei Hill (north of Padova) with a main NW-SE trend (SV in Fig. 1); ii) the Travettore-Codevigo fault to the E, extending for about 70 km from the foot of the pre-Alps to the to the south of the Venezia Lagoon (Codevigo) with a main NNW-SSE trend (TC in Fig. 1); iii) the Conselve-Pomposa fault to the SW, extending for about 80 km from the East of the Euganei Hill (south of Padova) to the south of the Po delta with a main NNW-SSE trend (CP in Fig. 1). The depth-converted sections (Fig. 2) show a general deepening from west to east and from north to south of all the recognised horizons (from Upper Triassic to Pleistocene). The W-E deepening is mainly related to faults with variable dip that are associated to the SVFS. These faults usually dip at high angle to ENE or NE and cut the horizons from Upper Triassic to Pliocene displaying a variable throw both in space and time (Tab. 2; Fig. 2). The geometric characteristics of the main faults of the SVFS are also depicted: i) the Schio-Vicenza fault dips 85° to ENE (section A-A’); ii) the Travettore-Codevigo faults dips 85° to 88° to ENE (section Fig. 3 – Map of the depth of the Pliocene base along the Schio-Vicenza fault system (SV: Schio-Vicenza fault; TC: Travettore-Codevigo fault; CP: Conselve-Pomposa fault). The contour lines (black solid lines; the depth is in metres below the ground level) show a deepening towards the S related to the Apennines Pliocene-Pleistocene flexuring. Conversely, the faults throw increase towards the NW (sketch in the inset). 189 GNGTS 2013 S essione 1.2