During a project to analyze the internal structure of landslides and identify and isolate their trig-gering factors, repeated geoelectric measurements in intervals of 1–2 years showed significant resistivity changes inside landslide-prone areas (Niesner and Weidinger, 2008). Changing water saturation was recognized as the most influential factor on these time-lapse resistivity profiles. Therefore repeated resistivity measurements should be able to observe the internal regime and dynamics of subsurface water. And, in turn, as changing water saturation is in most cases directly correlated with slope stability, a major factor influencing slope stability could be deduced from repeated resistivity measurements.

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