Abstract
Subsidence associated with coal mining activities in South Africa changes the natural environment in several ways. To monitor the evolution of surface subsidence, traditional field-based monitoring approaches, are employed. These measurements are point-based and frequent visits are necessary to map the evolution of surface subsidence basins over time. To address these limitations, differential interferograms derived from satellite-borne synthetic aperture radar (SAR) systems were tested for its ability to measure and monitor surface deformation. The SAR data was captured by the ERS-1 and ERS-2 satellites and covered a time frame between 2008-09 15 and 2008-09-15. Field data confirmed the presence of a subsidence basin detected using differential interferometry techniques during the 35 day period between 2008-04-12 and 2008-05-17 with a maximum vertical deformation of 3.2 cm being recorded. Interferometric monitoring revealed an eastward migration of the subsidence basin between 2008-06-02 and 2008-09-15 with an additional 4.7 cm of subsidence being observed.
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