Subsidence and collapse of unmapped shallow coal mine workings poses a risk to the public and hampers the development of valuable property. A high-resolution reflection seismic survey was conducted to determine whether it is possible to map the extent of the mine workings. Two 94 m profiles (tied to boreholes) were surveyed using a sledgehammer source. Processing was optimized to image the shallow reflections. The refraction seismic models and stacked time sections were compared and integrated with the borehole data to produce a 2-D geological model. It was concluded that high-resolution shallow reflection seismics could be successfully used to map the extent of the old mine workings provided adjustments are made to the acquisition and processing parameters.
Reference:
Mngadi, SB and Durrheim, RJ. High resolution reflection seismic mapping of shallow coal seams. Proceedings of the 13th SAGA Biennial and 6th AEM Conferences, Skukuza, Kruger National Park, South Africa, 6-9 October 2013, pp 1-3
Mngadi, S., & Durrheim, R. (2013). High resolution reflection seismic mapping of shallow coal seams. South African Geophysical Association. http://hdl.handle.net/10204/8106
Mngadi, SB, and RJ Durrheim. "High resolution reflection seismic mapping of shallow coal seams." (2013): http://hdl.handle.net/10204/8106
Mngadi S, Durrheim R, High resolution reflection seismic mapping of shallow coal seams; South African Geophysical Association; 2013. http://hdl.handle.net/10204/8106 .
