Subsurface cavity detection in a karst environment using electrical resistivity (er): a case study from yongweol-ri, south korea

ABSTRACTKarst voids were encountered during road construction in Yongweol-ri, South Korea. Attempts to determine the extent of the karst voids through drilling was expensive, time-consuming and too dangerous. An electrical resistivity survey was thus carried out to investigate current subsurface geo...