The role of material properties and landscape morphology on landslide size distributions

摘要: Abstract It has been observed that landslide size distribution shows power-law scaling for large areas, with a roll-over landslides below certain threshold which frequently coincides the modal peak of distribution. The physical reasons leading to this are not yet fully understood. analysis non-cumulative two inventories in Italian Alps confirms existence exponent 2.56±0.02, and demonstrates is due under-sampling since it occurs at sizes significantly larger than mapping resolution. control topography on investigated by topographic using virtual tiling method. We observe finer scales, comparable material properties geometry examined through deterministic probabilistic 2D limit-equilibrium slope stability analyses. Incoherent materials favour shallow no limitation size; cohesive deep show small sizes. Multilayered depth-dependent strength both landslides. joint probability (1) given gradient unstable (i.e., failure from analysis) (2) exists (topographic allows build synthetic distributions roll-over. For multilayered materials, we obtain power law 2.58±0.02. suggest results, study area, constraint presence or strength. an intrinsic characteristic distribution, contribution cohesion stability.