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SITE RESPONSE ESTIMATION IN VITTORIO VENETO ( ITALY )

The area of Vittorio Veneto (Treviso, Italy) was heavily injured by a M=5.8 event in 1936, localized at about 20 km of distance. The damage distribution was extremely heterogeneous, suggesting the influence of site effects. In order to assess the seismic response of this area, some geophysical surveys consisting of environmental seismic noise measurement (Nakamura’s approach), shallow seismic refraction have been carried out. The horizontal-to-vertical spectral ratios (HVSR) resulting from the ambient noise measurements reveal that most sites display clear resonant peaks, with variable HVSR amplitudes. The large amplitude of most peaks suggests the presence of a large impedance contrast between the sediment coverage and the underlying formation. In addition, we perform a shear wave velocity profiling based on the inversion of surface waves. The technique consists of a surface wave analysis performed on both singleand multi-channel records, by inverting the phase and group velocity of the Rayleigh wave fundamental mode. By using a non-linear inversion technique, we constrain the resulting equivalent Swave velocity profiles to feature S-wave velocity contrasts higher than two in a depth range of 8-20 m. In this way, we obtain some S-wave velocity models, whose fundamental frequencies match exactly those estimated independently by the HVSR. Additional information coming from other studies such as a geological studies, refraction seismic lines, geophysical drillings and down-hole measurements support our results.