Abstract: In the rolling hill area under the strong precipitation, the geohazards, such as mud flows and landslides, are frequently occurred in the well-developed, fractured zones in the geological tectonic structures and these hazards have large potential threat to the life and property loss of the public. In order to evaluate these factors that might induce the geohazards, such as, natural environment, form conditions, characteristics of the hazard and its potential target, geophysical investigation methods are frequently applied. Among these investigation methods, the high density resistivity method has the advantage of one-time setting the probes and the fast data acquisition could be obtained by using digital scanning device through the “U” type exception method to identify the geologically fractured zone.

Key words: High Density Resistivity Method, “U” Type Exception, Tectonic Fracture Zone