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Abstract:
Several studies, conducted over the last 20 years, have shown that ground motion in Italy is characterized by a strong regional variability and, in particular, tectonic and geological factors play key roles in the definition of the observed differences. In the early 2000s, several researches (Castro et al. 1999, Malagnini et al., 2000; 2002) were focused on conducting systematic studies of the regionalization in Italy using local dataset of small magnitude recordings of the seismic sequences that occurred in Italy in the early instrumental epoch.Recently, the availability of a large number of records from moderate-to-strong earthquakes on the entire Italian territory allowed us to review previous results, with the final aim of producing a new generation of Ground Motion Models (GMM) models for the calibration of shaking scenarios. In this work, the analysis of the residuals (logarithm differences between observations and GMM predictions) was exploited to describe the regional differences in terms of source and path effects across the country (Brunelli et al. 2023), confirming the results of the previous studies conducted in Italy. Based on these results, we developed a regionalised model for Italy, using an approach similar to that of Kotha et al. (2020) for source effects, and a zoneless approach for propagation effects. We also improved the near-source predictions, integrating the dataset with records from the NESS database (https://ness.mi.ingv.it/), and through the introduction of the explicit dependence on focal depth.
