## 6 Discussion  
In our study, satellite radar interferometry DInSAR method and Sentinel-1A/B radar images were used to detect LOS displacements caused by tremors induced by underground mining activity. Additionally, GIS functions were used to calculate vertical displacements and analyze geometry of the resulting deformations. Altogether, 68 interferograms were processed, and 37 interferograms were obtained for time bases from 6 days to 24 days. The remaining 31 interferograms were characterized with low coherence values, which could be caused by the coverage of the area with vegetation, presence of snow cover or the influence of weather conditions on the satellite signal. The greatest number of interferograms was obtained for the months of November, December, and February, ranging from 5 to 8 interferograms for a given seismic event. The smallest numbers of interferograms were generated for the months of January, April, and September, ranging from 2 to 4. As a result, a multiple data set was obtained for a statistical investigation of the geometry of deformations and an attempt to determine the shape of troughs resulting from tremors (generalized shape). Our study, contrary to other works [19; 20; 68; 69; 70], focused on determining the mean maximum values of vertical and not LOS displacements based on number of vertical displacement maps for each event. In addition, we have analyzed a large number (8) of seismic events caused by underground mining. Among the seismic events analyzed in our study three have been the subject of other research. The shock on 29 November 2016, was studied by [19; 21; 68; 69; 70] using both the DInSAR and/or SBAS methods, but based on a smaller number of interferograms. [PERSON] et al. [21; 68] determined the value of LOS displacements equal to \(-\)90 mm. Whereas, [PERSON] [69] in the his study determined this value as equal to \(-\)80 mm. In another study [19], the author calculated the cumulative LOS displacements using the SBAS method for seismic events that occurred in 2014-2018. Our results indicate value of maximum vertical displacements of \(-\)96 mm and generalized extent of the deformation area of 1.6 km \(\times\) 2.25 km based on superposition of five vertical displacement maps. For the two other previously analyzed events, i.e., shocks on 7 December 2017, and 26 December 2017, [PERSON] et al. [20] determined maximum LOS displacements at approximately \(-\)80 and \(-\)110 mm, respectively. These events were also studied by [PERSON] and [PERSON] [71] who determined maximum LOS displacements at \(-\)83 mm and \(-\)94 mm, respectively. Our present results, based on the superposition of 8 and 5 vertical displacement maps indicate subsidence of \(-\)85 and -109 mm, respectively and extent of the deformation area approximately 1.4 km \(\times\) 1.55 km and 1.85 km \(\times\) 2.35 km, respectively. In addition, [PERSON] [72] calculated the LOS displacement of deformation area (seismic event of the 29 January 2019) using various SAR data processing software and obtained max values of displacements ranging from \(-\)92 to \(-\)118 mm. In the result of our calculations, knowledge database of surface deformations manifesting after seismic events was created using the DInSAR and GIS methods. Processing of a large number of image pair for each seismic event allowed for verification of the results and identification of the geometry of the resulting area of deformation based on pixel-to-pixel relationship between vertical displacement maps for different time intervals and different orbits. Based on the literature [20; 21] it was assumed that deformations develop suddenly in a short period of time after the seismic event and thus various temporal baselines were analyzed together, i.e., between 6 and 24 days. All of the analyzed deformation areas occurred within the zone of direct influence of underground mining. This may point to the hypothesis that the seismic events accelerate manifestation of these direct effects (surface subsidence).