Sinkholes in dolomitic areas are notoriously difficult geophysical targets, and selecting an appropriate geophysical solution is not straightforward. Electrical resistivity imaging or tomography (RESTOM) is well suited to mapping sinkholes because of the ability of the technique for detecting resistive features and discriminating subtle resistivity variations. RESTOM surveys were conducted at two sinkhole sites near Pretoria, South Africa. The survey areas are located in the dolomites of the Lyttelton Formation, which forms part of the Malamani Subgroup and Chuniespoort Group of the Transvaal Super group. The survey results suggest that RESTOM is an ideal geophysical tool to aid in the detection and monitoring of sinkholes and other subsurface cavities.
Reference:
Van Schoor, M. 2002. Detection of sinkholes using 2D electrical resistivity imaging. Journal of applied geophysics, vol 50(4), pp 393-399
Van Schoor, A. M. (2002). Detection of sinkholes using 2D electrical resistivity imaging. http://hdl.handle.net/10204/1474
Van Schoor, Abraham M "Detection of sinkholes using 2D electrical resistivity imaging." (2002) http://hdl.handle.net/10204/1474
Van Schoor AM. Detection of sinkholes using 2D electrical resistivity imaging. 2002; http://hdl.handle.net/10204/1474.