Studies of the Hammana landslides, in the field and laboratory, enable their geological and engineering parameters to be assessed. The rocks, limestones, marls, sandstones, basalts and unconsolidated cover, possess a high variability in their lithological and geotechnical properties, inducing weakness and directly contributing to the instability of the area.
The types of mass movement correlate either with compact cliff-making rock units, (rock and debris falls and rock slides) or with surficial and other relatively unconsolidated materials, (earth flows and creep). The resulting dominant slopes, being upstanding, convex, concave and rectilinear, show differential stability. Slope stability analysis indicates a more stable “depositional” zone compared to the “erosional” zone.