*3.2. Geomorphological Analysis*

This analysis involved preliminary storing and managing existing data, retrieved from public authorities' technical reports, databases, and the scientific literature. Specifically, geological–geomorphological data were supplied by the CARG Project-Sheet 349 "Gran Sasso d'Italia" [88], the Abruzzo-Sangro Basin Authority [89], the IFFI database [90], and scientific publications [47,65]. These data were integrated and verified through geomorphological field mapping, carried out at an appropriate scale (1:5000–1:10,000), and stereoscopic air photo interpretation using 1:33,000- and 1:10,000-scale stereoscopic air photos (Flight GAI 1954 and Flight Abruzzo Region 1981–1987), as well as an analysis of 1:5000-scale orthophoto color images (Flight Abruzzo Region 2010) and Google Earth® imagery (2019–2020). Field mapping was focused on the definitions of the lithological features and geomorphological landforms, with reference to the main mass movements affecting the study area. It was performed according to the Italian geomorphological guidelines [91], international guidelines [92], and thematic literature concerning geomorphological mapping and analysis in different geological and climatic contexts, as well as field-based and numerical analysis [93–97].
