GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 2.2 295 Imax IX MCS) and Camerino (1799, Mw=6.18, Imax IX-X MCS) earthquakes (DBMI15 v4.0, Locati et al. , 2022). To reproduce the ground motion of the Fabriano and Camerino historical earthquakes, including site effects, we integrated in GIS the resulting Vs,30 base map with the GroundMotion Prediction Equation (GMPE, ITA18) proposed by Lanzano et al. , (2019). In this case study, given the absence of any earthquake-related surface fault rupture, we adopted the Joyner-Boore (1981; RJB) distance, which is the shortest distance from a site to the surface projection of the seismogenic structure. The seismogenic sources used in these simulations are ITIS048 “Fabriano” and ITIS049 “Camerino” from the DISS database (DISS Working Group, 2021). The outcomes of this workflow are maps of ground motion parameters (GMPs), such as peak ground acceleration (PGA), peak ground velocity (PGV), and peak spectral acceleration (PSA). Finally, the outcomes have been further investigated by converting the GMPs into macroseismic intensities using empirical relationships (Gomez et al. , 2020). A comparison of the synthetic intensity distribution with the observed macroseismic intensity (DBMI15 v4.0, Locati et al. , 2022) led to developing speculations about the characteristics of the still debated causative faults. Fig. 1 - Map of shear-wave velocity (Vs,30) of the Umbria and Marche regions. The black stars show the estimated epicenter locations of the two studied historical earthquakes, Fabriano (1741, Mw=6.17) and Camerino (1799, Mw=6.18).