Spatial cluster analysis and site effects in San Giuliano based on building typology and damage data collected after the 2002 Molise earthquake

This paper describes the methodology used to evaluate site effects in San Giuliano, based on building typology data and building damage data collected after the 2002 Molise-Puglia earthquake. The analysis has been performed within the working group, established by the Italian Civil Protection Department, in order to define a microzonation map for the area of San Giuliano. Despite the necessary approximations within the proposed methodology and the data inaccuracies, results clearly show that, in the historical centre, the seismic intensity (MCS) has been significantly smaller (2 degree less) than in the new expansion area. In addition, spatial cluster analysis on the ground motion amplification highlights a clear-cut boundary between the stiff soil in the historical centre and the soft soil in the expansion area.