GIS-based Approaches to Earthquake-Induced Landslide Hazard Zonation

摘要

This paper presents GIS-based deterministic approaches for earthquake-induced landslide hazard evaluation and zonation. These approaches combine numerical slope stability analysis with GIS spatial analysis to evaluate earthquake-induced slope failures, both shallow and deep-seated. The study focuses on GIS-based procedure of landslide hazard zonation, which involves one-, two-, and three-dimensional deterministic methods. The conventional slope stability analysis methods such as the widely used limit equilibrium methods in geotechnical engineering including block sliding model, methods of slices, and Hovland’s column method were incorporated into the GIS-based procedure. This paper also discussed causative factors analysis of earthquake-induced landslide hazards including the determination of peak ground acceleration, evaluation of the topographic effect of ground motion, and the seismic response analyses. The developed approach was applied to a specific site in the Balsamo Ridge area next to the city of Nueva San Salvador, El Salvador. The study demonstrated that the zonation map produced using the 2D and 3D methods has achieved such a level of accuracy that can be used for engineering design and decision-making in land use development.