Abstract
Quantitative estimates of present-day lateral ground surface displacement rates in southern Yakutia were obtained during recent years by setting up the first (and the only so far) stations of continuous GPS observation at the town of Neryungri (NRG) and at the town of Chul’man (CHL3). Both stations are in the southern margin of the Eurasian plate, near the system of active structures that separate it from the Amur plate. For an estimate of relative displacement we chose a period of joint operation at these two GPS stations, viz., from June 29, 2015 to December 1, 2016. The rate of displacement at Neryungri as calculated for a 5-year term (between October 27, 2011 and October 1, 2016) was 21.83 ± 0.73 mm/yr in the east–west direction and 12.26 ± 0.25 mm/yr in the north–south direction based on the ITRF2014 frame. The resulting values are little different from the theoretical rates of motion for the Eurasian plate at this point. The difference between measured rates and those for the well-known kinematic model for the Eurasian plate as developed in this study is |0.5| mm/yr for the east component and |1.0| mm/yr for the north component; these values are in agreement with results of other authors (Kreemer et al., 2014; Ashurkov et al., 2016). The accuracy of determination for the rates of lateral ground motion at CHL3 should enhanced by making measurements synchronously with the NRG2 station.
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ACKNOWLEDGMENTS
This study was supported by the Russian Foundation for Basic Research, project no. 19-05-00062, by the 2016–2020 Multidisciplinary Program for the Study of the Yakutia Territory financed by the Government of the Republic of Sakha (Yakutia), and within the framework of the IZK SO RAN project 346-2018-0001and the IGAIBM SO RAN project 0381-2616-0001.
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Imaev, V.S., Imaeva, L.P., Ashurkov, S.V. et al. Present-Day Displacements on Active Faults in the South Yakutia Coal Basin: GPS Observations. J. Volcanolog. Seismol. 13, 185–192 (2019). https://doi.org/10.1134/S0742046319030059
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DOI: https://doi.org/10.1134/S0742046319030059