Susceptibility regional zonation of earthquake-induced landslides in Campania, Southern Italy

In this paper we present a GIS-based method for regional zoning of seismic-induced landslide susceptibility and show its application to the territory of the Campania Region, Southern Italy. The method employs only three factors that we believe are most significant in the susceptibility assessment: the type of outcropping rock/soil, the slope angle and the MCS Intensity. Each of the three parameters is quantified in terms of relative weight expressed as indeces and the resulting Seismic Landslide Susceptibility index of an area is given by the average of the indeces of the first two factors multiplied by the index of the third factor. The result of this susceptibility zonation applied to Campania shows a good agreement between the distribution of the historical earthquake-triggered landslides and the highly susceptible zones.