ABEM LUND Imaging System () consisting of Terrameter with an automatic electrode selector was used to acquire apparent resistivity data during the survey. Consequently, an electrical resistivity tomography (ERT) survey was carried out to map the shallow subsurface strata at two proposed sites for future flyover bridges with the aims to detect and map the subsurface cavities. ![]() Several investigations were attempted including conventional geotechnical investigations using boreholes, however, these did not furnish necessary information to visualize the subsurface cavities. Recent development projects in the area included the construction of two flyover bridges at most heavily trafficked intersections in Hofuf city. These features have always been a hazard to the stability of the flyover bridges being built in the area. The Hofuf area in Eastern Saudi Arabia is marked by numerous karstic features including sinkholes, solution cavities and caves.
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