Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

triggered landslides (EQTLs) is higher on the hanging wall (Sato et al., 2007; Xu, Xu, Shen, et al., 2014; Xu & Xu, 2012). According to the above, it is expected that the accelerations associated with a seismic event in the SRF will trigger mass movements events, mainly surface landslides and rockfalls on the slopes of the mountain front. Tohave anapproximationof thehazardassociatedwith these events at the basin scale, sectors that are most susceptible to the generation of these events were defined. Susceptibility assessment at basin scale Susceptibility refers to the most favourable areas for the occurrence of a given hazard, without taking return periods into consideration. For a process to occur, there must be conditioning factors and triggering factors. The conditioning factors correspond to those conditions of a slope or outcrop that favour the generation of landslides and therefore favour susceptibility. Among the main conditioning factors are those associated with geomorphology, the main ones being slopes, the height of the hillside or slope, the extension or length of the hillside or slope, the orientation of the hillside and its curvature, among others. On the other hand, factors associated with geology and geotechnics are also relevant. The type of rock (lithology), the degree of weathering and/or alteration and the degree of fracturing are considered the most relevant at the basin scale. Triggering factors are factors that modify the pre- existing stability of the terrain and trigger the occurrence of a landslide event (González de Vallejo, 2002). Among the most common are heavy rainfall and earthquakes; volcanic eruptions, anthropic intervention, snow melt, among others, can also be considered, although with less relevance. In this study, a Susceptibility Index (SI) was estimated using an adaptation of a factor weighting methodology from Lara (2007). Susceptibility refers to the most favourable areas for the generation of a landslide event, without taking into consideration return periods or extent. The following factors were considered as conditioning factors for the analysis of susceptibility to rock falls, soil slides and shallow rock slides, at the basin scale: slopes, geological- geotechnical characteristics of material, snow accumulation, anthropogenic slope destabilisation, previous landslide and/or fall events, distance to the fault, topographic amplification and type of material (soil or rock). The SRF was considered both as a conditioning and as a trigger.