Site effects in Fabriano from post-earthquake typological and damage data collection

Post earthquake site effect evaluation is a necessary step in any reconstruction strategy. Although several approaches are available today, the time required for a detailed microzonation is not usually compatible with the reconstruction process. In this paper a probabilistic methodology able to estimate seismic intensity at any building location from post-earthquake building type and damage data, is proposed. The seismic intensity is evaluated by means of a Bayesian approach that requires previously assessed vulnerability functions and takes into account uncertainties in building type and building damage. An application for the town of Fabriano, hit by the 1997 Umbria-Marche earthquake is presented. Results are compared with the amplification of the ground motion predicted by the detailed microzonation.