Karst-collapse technogenic earthquake september 30 (29), 2017 in Stebnyk (Western Ukraine) and man-made provoked processes at Stebnyk potassic mine

The purpose of the work is a comprehensive analysis of the causes, characteristics and consequences of the karst-collapse technogenic earthquake that occurred on September 30, 2017 at 00:46 local time (September 29, 2017 at 21:46 GMT) in the city of Stebnyk in the area of the Mine No. 2 of the Stebnyk MCE “Polymineral”, its analysis in connection with technogenically provoked dangerous geological processes (in particular, with the formation of karst sinkholes) at the Stebnyk potash mine (Ukrainian Precarpathians). Methodology. The research methodology combines a comprehensive analysis of seismic, geological and other data in the Stebnyk potash deposit area, including specifying the localization of local earthquake foci, estimating the parameters of seismic sources, using for this purpose developed approaches and methods, adapted known and specially created computer and GIS technologies and their variants, developed appropriate software tools. Results. The modern seismic activation (2014-2024) of the Boryslav-Stebnyk area is briefly traced. Considering the long-term (from the beginning of the 19th century) active extraction of oil and gas condensate in the Boryslav area, as well as potash ores in Stebnyk, local seismicity is apparently partly additionally technogenically provoked (induced). Seismic events in the area of Mine No. 2 of Stebnyk MCE “Polymineral” are defined as karst-collapse technogenic earthquakes in the mining area of this mine. Technogenically provoked dangerous geodynamic processes in the area are traced and important energy and kinematic parameters of technogenically provoked seismic events caused by them are estimated. Based on data on the karst-collapse earthquake of September 30 (29), 2017 in Stebnyk and on data on the velocity structure of the crust of west of Ukraine, we clarified the hypocenters of local seismic events in the Boryslav – Stebnyk area and we determined for it local kinematic corrections for seismic stations of the Carpathian Seismological Network of Ukraine and for a number of seismic stations in Poland, Slovakia, Hungary and Romania. Originality. For the first time, using data on the velocity structure of the Earth's crust in the Carpathian region of Ukraine, methods of refining the seismic events foci in the area of the cities of Boryslav – Stebnyk – Drohobych – Truskavets have been developed. With their use, as well as based on the results of determining the characteristic parameters of the foci of local seismic events, the technogenic karst-collapse nature of seismic events in the area of Mine No. 2 of the Stebnyk potash deposit has been unambiguously established and their important characteristics have been determined. Practical significance. The results of the research make it possible to clarify the nature of the processes and assess natural and technogenic geoecological risks for the Boryslav – Stebnyk – Drohobych – Truskavets area, in particular, in the area of Mine No. 2 of the Stebnyk potash deposit for development an optimized set of necessary engineering and technical measures to minimize these risks. The determined local kinematic corrections for seismic stations of the Carpathian Seismological Network of Ukraine and for seismic stations of Poland, Slovakia, Hungary and Romania provide a significantly more precise determination of the coordinates and depths of the foci of local seismic events in the Boryslav – Stebnyk area, both natural and technogenic in genesis.

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