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Underground mining leads to creation of subsidence depression on the surface of the undermined territory. An observation network was built to be used for repeated surveying by GPS. From GPS data the surface subsidence was computed. The evaluation of the progress of the subsidence of surface points shows on an important influence of tectonic faults, earlier undermining and generally the geo-mechanical condition of the massif on the surface subsidence.

Underground exploitation of coal deposits in KarvinР° region results in movements and deformations on the surface where a subsidence depression starts to create. The extraction activity under non-trivial geological and geo-mechanical conditions may cause unexpected time-spatial surface changes and different shape and range of creating subsidence depression. To observe the surface changes caused by underground mining in such area we decided to build up an observation station of points that are repeatedly surveyed b...