GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.2 213 the pseudo-bending method (Um and Thurber, 1987), we used a regular horizontal grid with 10 km×10 km node spacing, covering an area of 110 km×110 km. In the vertical directions we used a grid spacing of 2 km, covering a depth range from the surface to 24 km, as in Brancato et al. (2009). A minimum 1D velocity model was used as input for the 3D inversion, with the initial V P /V S fixed at a constant value of 1.78 at all nodes, based on previous studies in the investigated area (Musumeci et al., 2003; Piana Agostinetti and Amato, 2009). Figgs. 1 and 2 show the horizontal slices at different depths and the N-S and W-E cross Fig. 3 – Q P model resulting from the 3D inversion. S-N and W-E vertical sections along the traces reported at 0 km level are also shown. The zones with RDE≥ 0.35 SF ≤ 4.5 and DWS > 100 shown with thick black, dotted white and dashed white contour lines, respectively.