Geophysical research: article

I.P. Babayantz1
A.A. Baryakh2
M.S. Volkova1
V.O. Mikhailov1
E.P. Timoshkina1
S.A. Khairetdinov1
1 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia 2 Mining Institute of the Ural Branch of the Russian Academy of Sciences, Perm, Russia
Journal: Geophysical research
Tome: 22
Number: 4
Year: 2021
Pages: 73-89
UDK: 550.31
DOI: 10.21455/gr2021.4-5
Full text
Keywords: SAR interferometry, monitoring of subsidence, potash mines, Berezniki, sinkholes
Аnnotation: The paper discusses the methodological issues of SAR monitoring (differential satellite interferometry DInSAR and stable reflectors) of the ground surface subsidence over Berezniki potash mines (Perm region). The subsidence caused by mining works has occurred for many years, but its rate remained low for a long time. The situation changed dramatically in 2006, when the largest accident in the world practice of exploration of water-soluble ore-deposits occurred – the mine of the First Bereznikovski Potash Mining Administration was flooded. The mine was located directly under the town of Berezniki, the second largest city in the Perm district, with a population of about 150 thousand people. We have estimated the displacements of the ground surface by the method of differential satellite interferometry DInSAR, based on the interferometric processing of pairs of TerraSAR-X satellite images, performed with 11-day interval. We demonstrated that satellite data steadily recovers the current subsidence in the territory of Berezniki. This allows monitoring of subsidence with minimal time delay. The displacements in the main subsidence areas for 22 and 33 days are confidently distinguished from SAR images against the background of various noises. Calculations of displacements based on pairs of the Sentinel-1B SAR images, which have a longer wavelength, turned out to be not stable enough. Due to the lower coherence, the displacement maps obtained from the images of this satellite are less detailed. Therefore, we recommend using the Sentinel-1B images for calculating the time series of displacements by the methods of persistent scatterers. The assessment of subsidence within the territory under consideration by the indicated methods will be presented by the authors in the next article. The obtained subsidence fields are in good agreement with the ground geodesy data. The calculation resuls allow us to conclude that despite the continuing subsidence of the ground over the sinkholes, in general, the measures taken to stabilize the subsidence work effectively.
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