The complex
nature of many landslides necessitates the need for investigating their
characteristics. It becomes important that the internal structure of the
landslide and its surrounding environment be determined in order to facilitate
reliable stability analyses and risk mitigation. Models of landslide structure
have traditionally been constructed based on geomorphic observations with the
aid of subsurface data obtained by boreholes, excavations and when possible by
geophysical surveys. A landslide located on the White Mountain in Nablus city,
Palestine is used as a case study to demonstrate the utility of a
geophysical
approach to subsurface mapping of unstable slopes. A total of 960 m profiles
were collected using Seismic refraction method. Seismic data were interpreted
based on stratigraphic and eomorphologic observations, and then integrated into
a 3-dimentional model constrained with geologic data from 10 boreholes
penetrated the landslide and adjacent terrain. Surfaces of rupture and
separation were successfully identified by seismic refraction techniques which
was effective for resolving stratigraphic relationships between units to a
maximum depth of 35 m. The landslide is also analyzed using
PCTANI
& GALENA V3 software to put the various classes of parameters in order of
its significance to the process of landsliding (landslide susceptibility
mapping) and weigh the impact of one parameter against another. The results of
this study describe the slopinstability processes and geological hazards
affecting the housing on the White Mountain and the surrounding urban areas.