GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.1 - POSTER GNGTS 2023 Fig. 3 Comparison between GMM (Schiappapietra et al., 2022; black lines), recorded SD spectra (Sgobba et al., 2021; blue lines), and PBS mean displacement spectra (red lines) at a) and b) PCB, c) and d) RFC; e) and f) SPD; on the left panels the horizontal component (geometrical mean), on the right boards the vertical component. Thin red and black lines show the related standard deviation (reproduced from Moratto et al., 2023). The computed broadband seismograms constrain the upper bound of the simulated ground motion at specific sites; numerical simulations can exceed the limits of the GMM in the near source to fit observations and define reliable seismic input. However, ground motion simulations require a constrained definition for the seismic source, the propagation, and local site effects; adequate knowledge of these parameters' bounds is a primary key to defining reliable strong motion and uncertainties of the results. This approach, extensively described by Moratto et al. (2023), can be applied in other areas with high seismic hazard to evaluate the seismic safety of existing critical facilities.