A study of the influence of water level fluctuations on the geodynamic situation in the natural and technical geosystem of the Dniester HPP and PSPP cascade

1
Yuriy Fedkovych Chernivtsi National University
2
Yuriy Fedkovych Chernivtsi National University
3
Lviv polytechnic National University

Purpose. Statistical information for the period from 2016 to 2021 was used to analyze seismic activity. Objective. The aim of the study is to identify the relationship between changes in water level and local seismic activity in the region. Using HPP and Psing filtering, the hypocenters of earthquakes within a radius of 30 km from the seismic station with the NDNU index were selected, and using geographic information technology tools, the hypocenters of earthquakes were compared with the geological structure of the region. Methodology. Statistical information for the period from 2016 to 2021 was used to analyze seismic activity. Using filtering, the hypocenters of earthquakes within a radius of 30 km from the seismic station with the NDNU index were selected, and using geographic information technology tools, the hypocenters of earthquakes were compared with the geological structure of the region. Results. The studies revealed a correlation between seismic events and water level fluctuations in the reservoir. The paper also established the density of episodes concentrated in the reservoir operation area, as well as the magnitude and shallow depth, indicated the probability of activation of faults located in geological layers close to the ground surface. The stresses in the soils were assessed. Using the Coulomb-Mohr theory, the ultimate stresses leading to the destruction of structural ties were calculated approximately, and the optimal modes of operation of the reservoir were determined. Originality. The research in the article allows us to more accurately assess the effect of the stress gradient in the soils on the background seismicity in the reservoir operation area. Practical significance. The practical significance of this study is understanding the effect of the stress gradient on induction earthquakes. The described method, which is based on the principles of Coulomb's law and Mohr's theory, allows us to remotely study the behavior of the material under different loading conditions. This study and the development of a geomechanical model helps to better understand and predict earthquake behavior and determine safe loading zones. This has practical implications for the design and construction of structures, as well as for risk assessment and appropriate safety measures.

  1. Anderson, E. M. (1905). The dynamics of faulting. Transactions of the Edinburgh Geological Society, 8(3), 387–402. https://doi.org/10.1144/transed.8.3.387 
  2. Brusak, I., & Tretyak, K. (2021, October). On the impact of non-tidal atmospheric loading on the GNSS stations of regional networks and engineering facilities. In International Conference of Young Professionals «GeoTerrace-2021» (Vol. 2021, No. 1, pp. 1-5). EAGE Publications BV. https://doi.org/10.3997/2214-4609.20215K3013
  3. Brusak, I., Tretyak, K., & Pronyshyn, R. (2022). Preliminary Studies of Seismicity Caused by the Water Level Changes in Dnister Upper Reservoir. International Conference of Young Professionals «GeoTerrace-2022». https://doi.org/10.3997/2214-4609.2022590022
  4. Célérier, B. (2008). Seeking Anderson’s faulting in seismicity: A centennial celebration. Reviews of Geophysics, 46(4). https://doi.org/10.1029/2007rg000240 
  5. Chopra, A. K., & Chakrabarti, P. (1973, April 1). The Koyna earthquake and the damage to Koyna Dam. Bulletin of the Seismological Society of America, 63(2), 381–397. https://doi.org/10.1785/bssa0630020381
  6. Day, S. M., Yu, G., & Wald, D. J. (1998, April 1). Dynamic stress changes during earthquake rupture. Bulletin of the Seismological Society of America, 88(2), 512–522. https://doi.org/10.1785/bssa0880020512
  7. Geidt, V. D., Geidt, L. V., Geidt, A. V., & Sheshukova, S. V. (2021, December). Effect of Deep Vibration on Physical State of Soil Being Changed. Civil Engineering and Architecture, 9(7), 2273–2277. https://doi.org/10.13189/cea.2021.090714
  8. Gupta, H. K. (1992). Reservoir induced earthquakes. Elsevier.
  9. Howells, D. A. (1974). The time for a significant change of pore pressure. Engineering Geology, 8(1-2), 135–138. https://doi.org/10.1016/0013-7952(74)90020-9
  10. International Seismological Centre. (n.d.). Retrieved from http://www.isc.ac.uk/
  11. Karl, T. (1962, June). Measurement of Stresses in Rock. Géotechnique, 12(2), 105–124. https://doi.org/10.1680/geot.1962.12.2.105
  12. Keith, C. M., Simpson, D. W., & Soboleva, O. V. (1982, June 10). Induced seismicity and style of deformation at Nurek Reservoir, Tadjik SSR. Journal of Geophysical Research: Solid Earth, 87(B6), 4609–4624. https://doi.org/10.1029/jb087ib06p04609
  13. Parotidis, M., Rothert, E., & Shapiro, S. A. (2003). Pore-pressure diffusion: A possible triggering mechanism for the earthquake swarms 2000 in Vogtland/NW-Bohemia, central Europe. Geophysical Research Letters, 30(20), n/a–n/a. https://doi.org/10.1029/2003gl018110
  14. Petruccelli, A., Schorlemmer, D., Tormann, T., Rinaldi, A. P., Wiemer, S., Gasperini, P., & Vannucci, G. (2019). The influence of faulting style on the size-distribution of global earthquakes. Earth and Planetary Science Letters, 527, 115791. https://doi.org/10.1016/j.epsl.2019.115791
  15. Purcaru, G., & Berckhemer, H. (1982, April). Quantitative relations of seismic source parameters and a classification of earthquakes. Tectonophysics, 84(1), 57–128. https://doi.org/10.1016/0040-1951(82)90154-8
  16. Savchyn, I., & Vaskovets, (2018, January 18). Local geodynamics of the territory of dniester pumped storage power PLANT. Acta Geodynamica Et Geomaterialia, 41–46. https://doi.org/10.13168/agg.2018.0002
  17. Savchyn, I., & Pronyshyn, R. (2020, September). Differentiation of recent local geodynamic and seismic processes of technogenic-loaded territories based on the example of Dnister Hydro Power Complex (Ukraine). Geodesy and Geodynamics, 11(5), 391-400. https://doi.org/10.1016/j.geog.2020.06.001
  18. State Service of Geology and Mineral Resources of Ukraine. (2021). State geological map of Ukraine on scale of 1:200,000 sheets M-35-XXVIII (Bar), M-35-XXXIV (Mohyliv-Podilskyi). https://www.geo.gov.ua/
  19. Talwani, P. (1976). Earthquakes associated with the Clark Hill reservoir, South Carolina — A case of induced seismicity. Engineering Geology, 10(2-4), 239–253. https://doi.org/10.1016/0013-7952(76)90024-7
  20. Talwani, P. (1997, December). On the Nature of Reservoir-induced Seismicity. Pure and Applied Geophysics, 150(3–4), 473–492. https://doi.org/10.1007/s000240050089
  21. Talwani, P., & Acree, S. (1986). Pore pressure diffusion and the mechanism of reservoir-induced seismicity. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 23(4), 126. https://doi.org/10.1016/0148-9062(86)90658-3
  22. Tretyak, K., & Brusak, V. (2022, June 28). Modern deformations of Earth crust of territory of Western Ukraine based on «GEOTERRACE» GNSS network data. Geodynamics, 1(32)), 16–25. https://doi.org/10.23939/jgd2022.02.016
  23. Ukrhydroenergo. (2023). https://uhe.gov.ua/filiyi/dyrektsiya_z_budivnytstva_dnistrovskoyi_haes
  24. Wang, C. Y., & Manga, M. (2021). Earthquakes influenced by water. In Water and Earthquakes (pp. 61-82). Cham: Springer International Publishing. https://doi.org/10.1007/978-3-030-64308-9
  25. Zhao, R., Xue, J., & Deng, K. (2022, September 15). Modelling seismicity pattern of reservoir-induced earthquakes including poroelastic stressing and nucleation effects. Geophysical Journal International, 232(2), 739–749. https://doi.org/10.1093/gji/ggac361
  26. Zoback, M. D. (2010, April 1). Reservoir Geomechanics.
  27. Zyhar, A., Savchyn, I., Yushchenko, Y., & Pasichnyk, M. (2021, June 29). Analysis of inclinometric observations and prediction of soils deformations in the area of the Dnister PSPP. Geodynamics, 1(30), 17-24. https://doi.org/10.23939/jgd2021.01.017