GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Earthquake Induced Landslides (EILs) occurrence and earthquake parameters: new empirical relationships developed using the updated CFTI historical dataset J. Cinosi 1 , C. Zei 2,3 , V. Piattelli 1 , C. Ciuccarelli 3 , G. Tarabusi 3 , T. Piacentini 1,3 , E. Miccadei 1,3 , P. Burrato 3 1 Dipartimento di Ingegneria e Geologia, Università degli Studi “G. d’Annunzio” di Chieti-Pescara, Italy; 2 Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Italy; 3 Istituto Nazionale di Geofisica e Vulcanologia, Italy The ground shaking generated by the arrival of seismic waves released during earthquakes, besides generating damages to the urban environment and artificial infrastructures, can trigger widespread environmental coseismic effects, overall defined as secondary Earthquake Environmental Effects (EEE) in the Environmental Seismic Intensity scale (ESI; Michetti et al., 2007). These natural effects include river ponding or diversion, liquefaction, ground compaction and failures and, among all, landslides. If, due to geological and geomorphological reasons, the area hit by the earthquake is susceptible to their occurrence, they take place almost constantly, regardless of the kinematic characteristics of the seismogenic sources, and affect areas of variable size according to the earthquake magnitude. Besides potentially increasing overall earthquake damage immediately after the mainshock, they pose long lasting secondary hazards to earthquake affected areas (e.g. Fan et al., 2019), driving also the long-term morphological evolution of the territory (e.g. Wang et al., 2020). Earthquake Induced Landslides (EILs) are among the most diffused environmental hazard connected to the earthquake activity, and especially affect recent, high relief mountain landscapes associated to the ongoing tectonic plate dynamics. There exist in fact reciprocal feedbacks between active tectonics, which in the long-term creates the predisposing morphological and geological factors, and landslide activity, which works for lowering the topographic gradients. Italy sits on the plate boundary separating the slowly converging Eurasia and Nubia plates, which in the long run created its mostly mountain territory, and is characterized by a relatively high seismic hazard. The combination of the relatively frequent seismic release and the locally high landslide susceptibility (Fig. 1), makes the Italian territory especially prone to EILs occurrence. This is