GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.1 GNGTS 2024 Fig. 1 – Seismic history of Ferrara (1000-2020) from Locat et al. (2022). The dated earthquakes are local ones (i.e. with epicentral locaton “in” Ferrara or in the “Ferrarese”). Up to now our study has considered some dozen earthquakes with M ≥3.5, dated between 1234 and 1495, of which 11 are located by the CPTI15 catalogue (Rovida et al., 2022) in Ferrara, 3 in Modena, while a couple of cases are unknown to the CPTI15 catalogue. A couple of these earthquakes were never studied at all, in several cases epicentral parameters are derived from reference studies that are almost 20 years old, and in 5 cases even 40 years old. The informatve basis for these earthquakes, as summarized in Locat et al. (2022) and Rovida et al. (2022) is rather poor. In many case informaton on a single locality is available from a single source, whose intrinsic value and reliability are also questonable. The preliminary results of the revision work are generally an improvement of the intensity estmates. In a few cases, the studied earthquakes turned out to be doubtul or completely fake. Tab. 1 – The list of earthquakes in the Ferrara and Modena currently under revision (tme window: 1234-1500; M≥ 3.5).