Amplification of ground motions incorporating uncertainty in subsurface soils throughout extensive seismic microzonation data

Different uncertainties sources affect the results of site response studies. Thus, the variability of the resulting synthetic hazard parameters should be modelized by considering appropriate probability distributions obtained by reproducing effects induced by stratigraphy and topography. Within this framework, a Project named PRIN SERENA aims at joining spatialized information (surface geology, topography), available over the whole Italian territory, with the outcomes of local surveys (shallow seismostratigraphic and geotechnical information after geognostic prospections) within a coherent frame. Particularly, a specific WorkPackage (WP3) is devoted to combining the effects of the velocity profiles variations and the variability in shear modulus reduction, G/G0 (?) and damping ratio, D(?) curves. Large scale extensive seismic microzonation studies have been explored for this purpose to properly aggregate information (Romagnoli et al., 2022; Gaudiosi et al., 2021). The present work provides insights from sensitive analyses carried out for prototypal sites in Italy and a state of art of the models obtained from the seismic microzonation studies to highlight the relevant geological and geophysical site signatures.