Probabilistic seismic hazard assessment and deterministic ground shaking scenarios for Vittorio Veneto (N.E. Italy)

Probabilistic seismic hazard estimates have been assessed for the Vittorio Veneto broader area in north-eastern Italy and two deterministic ground shaking scenarios have been computed for the study site, respectively for the design and extreme earthquakes. Different hazard parameters and three soil conditions have been taken into account. The probabilistic estimates will be used to compute a regional seismic risk map. The two deterministic ground shaking scenarios will constrain the ones obtained by complete ground motion modelling and will be used for the detailed damage assessment at Vittorio Veneto in the case of future possible earthquakes. The results, although not very high (the median value on soft soil plus the total uncertainty is 0.64 g in the worst case), refer to shakings that can produce also significant damage. The median ground motion on rock expected in Vittorio Veneto from the two scenario earthquakes are very similar to each other (respectively 0.16 and 0.22 g). An even more interesting aspect is that they do not differ much from the probabilistic estimate for a 475-year return period (0.21 g). These similarities are justified by the characteristics of the seismicity influencing the study site.