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.
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