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The preliminary temporal analysis of ground deformations in the area of Dabrowski Coal Basin (south Poland)

In this work the preliminary temporal analysis of ground deformations in the area of Dabrowski Coal Basin was performed. In this region the intensive coal exploitation has been performed for about 200 years. The studied region covers the mining areas of seven coal mines. Moreover this area is crossed by many faults. In the described work the analysis concerned only the small, long lasting deformations that were detected using PSInSAR technique. The aim of this work was to analyze the changes in the deformations' trend between years 1992 and 2003 for each PS point. In order to perform this task the special algorithm was developed. It allows detecting maximum one (the most significant) trend change in the considered period of time. Performed analysis revealed that in the study area the changes of trend deformations occurred for about 40% of PS points. The spatial and temporal distribution of PS points with trend changes showed some regularity. This regularity may indicate the influence of coal exploitation on the values of small, long period deformations that were previously explained only by neotectonics movements.