Comparison of GIS-based methodologies for the landslide susceptibility assessment

In this paper, two simple GIS-based methodologies have been used to assess thelandslide susceptibility in a basin located in Southern Italy. The methodologies at issue, basedon the spatial distribution of landslides and/or of causal factors, are bivariate statistics-basedand expert-based, respectively. The spatial distribution of both the landslides and the causalfactors has been investigated by integrating pre-existing and original data, which have beenprocessed using ArcView GIS 3.2 software. The obtained results, consisting of landslidesusceptibility maps have been compared and discussed. The bivariate statistics-based methodhas provided the most satisfying results. On the contrary, the expert-based method has provideda classification of the study area in terms of landslide susceptibility which does not completelyfit with the surveyed spatial distribution of the landslides.