GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Satellite images provides an independent method to survey EEEs; we mapped earthquake-triggered landslides by comparing pre- and post-event images. This method allows to systematically cover a wide area and to produce an inventory of slope movements. The quality of the inventory depends on the availability of suitable images (e.g., cloud-free) acquired as soon as possible after the earthquake. Thus, the main challenges refer to the difficulty of distinguishing between landslides caused by the mainshock, aftershocks, and rainfall after the event. Two months after the earthquake, we collected information on 143 EEEs from online resources. Figure 2 shows a categorization based on the type of effect: 79 Slope movements, 24 ground cracks, 18 Anomalous waves and tsunamis, 11 Liquefaction phenomena, 4 Hydrological changes, 4 Tectonic uplift\subsidence, 3 other secondary effects. Fig.2: preliminary results of the EEEs documented from field reconnaissance and online resources. The realization of the inventory of earthquake-triggered landslides is still ongoing; currently, more than 1000 slope movements have been identified; Figure 2 presents an example of pre- and post-event imagery, showing several landslides clustering along a coastal road. We will investigate the spatial pattern of landslides, using descriptors such as Landslide Number Density (LND) and Landslide Area Percentage (LAP), computed on 1 km 2 cells over the entire affected territory; we will assign an ESI-07 value to each slope movement, by using area-volume scaling laws and we will integrate these data with those collected in the field to derive a macroseismic field.