Analysis of trend changes of ground deformation in the selected mining areas in Dabrowski Coal Basin (South Poland)

In presented work the analysis of temporal trend changes of small, long period ground deformation was shown. The general analysis concerns the selected mining areas of Dabrowski Coal Basin (south Poland) and more detailed analysis was performed for "Grodziec" coal mine. The ground deformations for time period between 1992 and 2003 were determined using PSInSAR technique. Performed analysis revealed that for some stable scatterers in analysed period of time the changes of deformation´s trend occurred. The location of PS points with trend changes is not random (both in time and space). It was found that for first part of studied time period when the "Grodziec" coal mine was working for most PS points the increase of subsidence velocity was detected. The situation has changed after abandon the mine. After 1998 for most stable scatterers the decrease of subsidence velocity was revealed.