GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 testified by the numerous coseismic landslide inventories compiled after recent earthquakes (e.g. Guzzetti et al., 2009). Figure 1: comparison between the seismic hazard and landslide susceptibility maps for the Italian territory and conterminous regions. The seismic hazard map on the left is from the 2020 European Seismic Hazard Model (ESHM20; Danciu et al., 2021) and is available at http://www.efehr.org/start/. The landslide susceptibility map on the right is the European Landslide Susceptibility Map v.2 (ELSUS v2; Wilde et al., 2018) and is available at https://esdac.jrc.ec.europa.eu/. As a first step of our workflow, we revised the database of seismic induced environmental effects connected to the CFTI5Med historical seismic catalogue (available at https://storing.ingv.it/cfti/cfti5/ ; Guidoboni et al., 2018; 2019). To achieve this goal, we collected new data points from new historical sources, revised the EILs already included in CFTI, and finally, in a dedicated GIS environment, we tried to locate them on topographic maps using the coeval descriptions. In some cases, it was possible to associate the historical EILs to landslides included and described in the Italian Landslide Inventory (IFFI database; Trigila et al., 2007). Following this, landslides were subdivided into three classes according to their positioning precision, i.e.: Class A if they were geographically well located using a toponymal (A I if associated to one of landslides included in IFFI); Class B, if they were generally located in an area (B I if associated to one of landslides included in IFFI); Class C, if not localized. The revised CFTI database includes more than 1000 historical EILs, associated to 159 individual earthquakes or seismic sequences occurred between 117 B.C.E. and 1997 (Fig. 2). With respect to the datasets used so far for deriving empirical relationships (e.g. Livio and Ferrario, 2019; Tanya ş et al., 2017), these figures dramatically increase the number of available data points for the Italian territory.