GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.3 GNGTS 2023 a GIS procedure was used to calculate the moving average of the data within a 500 m radius circle, starting from the centroid of each hexagonal cell. The same approach was adopted for the analysis of the questionnaires collected for the May 20, 2012 earthquake in Emilia (Mw=6.1). For both the Petrinja and Emilia earthquakes, we superimposed the residual intensity maps on the geological map (Carulli et al. 2002). The residual intensity maps agree well with the ground amplifications that would be expected based on the local geology. This study represents a positive case of citizen science being useful to increase knowledge and contribute to seismic risk reduction. The information provided by citizens was found to be reliable when properly analyzed and therefore can be used to provide a first approximation of reliable ground information when it is not available. Obviously, the more people involved, the better the resolution of the maps.