Prediction of seismic impacts at the site of Plavinu HPP from a potential seismic source in Koknese (Latvia)
Received: October 14, 2023
Latvian Environment, Geology and Meteorology Center, Riga
Carpathian Branch of Subbotin Institute of Geophysics of NAS of Ukraine

The study considers the impact of seismic waves from the source of a potential earthquake in Latvia on the site of the Plavinu hydroelectric power station, which is located in unfavorable geological, tectonic, and geodynamic conditions. A direct seismology problem was solved in two stages to assess seismic impacts on the site. In the first stage, the modeling of synthetic seismograms was carried out, and in the second stage, a prediction of seismic impacts at the hydroelectric power station site was conducted. In the first stage, we used wave field modeling applying Green's method. In the second stage, ground motion characteristics were obtained using a one-dimensional, nonlinear ground response analysis method. A wave field of 15 Green's functions was obtained, which was then converted into a 3-component accelerogram. The accelerogram was then used as a seismic impulse to a Prequaternary sediment's surface. A set of engineering and seismic characteristics of soil was obtained, i.e. amplification, Fourier amplitudes, and spectral amplitudes. The paper demonstrates the ability to acquire valuable information about the seismic wave field and ground motion from macroseismic data from historical earthquakes. This is especially important for intra-plate conditions with limited seismic statistics. Prediction  of engineering and seismic conditions are of great practical importance since they will allow us to identify the most vulnerable sites of the soil at the Plavinu HPP.


  1. 1. AS Latenergo. (2014). Plavinu HES hidrotehnisko buvju drosuma deklaracija. Parskats par HES hidrotehnisko buvju drosuma programmas izpildi laikposma no 2013.g.1.janvara lidz 2013.g.31.decembrim. Author: Z. Zegele (In Latvian).
    2. Avotinya I.Ya., Boborykin A.M. et al (1988). Catalog of historical earthquakes in Belarus and the Baltic states. Seismological bulletin of seismic stations "Minsk" (Pleschenitsy) and "Naroch" for 1984, 126 - 137 (In Russian).
    3. Bardet J.P., Tobita T. (2001). NERA. A Computer Program for Nonlinear Earthquake site Response Analyses of Layered Soil Deposits. 44 p.
    4. Boborykin et al. (1995). Seismotectonic studies of the west of the East European Platform (Belarusian-Baltic region). Seismological Research, 2, 5 - 54 (In Russian).
    5. Doss B. (1909). Die historish beglaubigten Einsturzbeben und seismish-akustishen phonomene der russischen Ostseeprovinzen. Beitrage tuz Geophysik. Leipzig, B.X, H.1, 1 - 124 (In German).
    6. FENCAT. Catalog of earthquakes in North Europe 1375-2014.
    7. Fugro Consult GmbH. (2015). Report. Geophysical investigation from the right bank boreholes at Plavinas HPP and in the horizontal profiles of the area next to the powerhouse. Abteilung Geophysik Suptitzer Weg 28 A, DE-04860 Torgau. Author: F.Meier.
    8. Fugro Consult GmbH. (2014). Investigation Works in the Plavinas HPP, 2014. Abteilung Geophysik Suptitzer Weg 28 A, DE-04860 Torgau. Author: C. Richter.
    9. Gregersen S., Wiejacz P., Debski W. et al. (2007). The exceptional earthquakes in Kaliningrad district, Russia on September 21, 2004. Physics of Earth and Planetary Interior, 164, 63 - 74.
    10. Hermann R.B. (2002). Computer Programs in Seismology. An overview of synthetic seismogram computation.
    11. Iwan W.D. (1967). On a class of models for the yielding behavior of continuous and composite systems. Journal of Applied Mechanics, ASME, 34, 612 - 617.
    12. Liu S., Zhou Z., Dai S. Et al., 2021. Fast Computation of Green Function for Layered Seismic Field via Discrete Complex Image Method and Double Exponential Rules. Symmetry, 13, 1 - 12.
    13. Mroz Z. (1967). On the description of anisotropic workhardening. Journal of Mechanics and Physics of Solids, 15, 163 - 175.
    14. Nikonov A.A., Pačesa A., Aptikaev F.F., Nikulin V.G., Puura V., Aronov A.G. (2007). Kaliningrad, September 21, 2004, Earthquake in the East Baltic area - basic macroseismic maps for three main shocks. Seismicity and seismological observations of the Baltic region and adjacent terrirories. Volume of abstracts. 60 - 62.
    15. Nikonov A.A. (2010). Frost shaking as a special class of seismic phenomena (based on materials from the East European Platform). Physics of the Earth, 3, 79 - 96 (In Russian).
    16. Nikulins V. (2007). An overview of the results of the work, the assessment of the seismic impact on the buildings and the conditions on the building, in accordance with the requirements of Eurostandard 8, the preparation of the national annex project LVS EN 1998-1:2005 and proposals for amendments to the building standard LBN-005-01 "Engineering rules for construction" (In Latvian).
    17. Nikulin V. (2011). Assessment of the seismic hazard in Latvia. Version of 2007 year. Material Science and Applied Chemistry, 1, 24, 110 - 115.
    18. Nikulins V. (2019). Geodynamic Hazard Factors of Latvia: Experimental Data and Computational Analysis, Baltic Journal Modern Computing, 7 (1), 151 - 170.
    19. Nutti O.W., Zollweg J.E. (1974). The Ralation Between Felt Area and Magnitude for Central United States Earthquakes. Bulletin of Seismological Society of America, 64, 73 - 85.
    20. Soosalu H., Uski M., Komminaho K., Veski A. (2022). Recent Intraplate seismicity in Estonia, East European Platform. Seismological Research Letter, XX, 1 - 12.