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The March 29, 2019 Earthquake in the Western Part of the Tunka Rift Basin System: Source Parameters and Macroseismic Effects

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Abstract

The paper considers one of the perceptible earthquakes that occurred on March 29, 2019, in the western part of the Tunka rift basin system. The epicenter of this seismic event was localized within the Hoytogol basin. The earthquake source parameters were as follows: hypocentral depth (h = 36–37 km), scalar seismic moment (M0 = 1.6 × 1016 N m), moment magnitude (Mw = 4.8), and focal mechanism—were determined using joint inversion of surface wave amplitude spectra and polarities of P-wave first arrivals. The focal mechanism demonstrates the predominance of combined thrust and strike-slip movements, indicating uplifting tectonic movements in the Hoytogol basin. The shaking from the earthquake was felt within a vast area, with an intensity of up to I = III at epicentral distances up to 490 km. Macroseismic data were obtained using different methods, including an interactive questionnaire hosted on the website of the Baikal Branch of GS RAS. Analysis of the macroseismic data made it possible to formulate the goal of refining the regional macroseismic field equation.

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Funding

The study was supported by the Ministry of Education and Science of the Russian Federation (state assignment no. 075-01304-20), with use of data obtained by the Baikal Branch of GS RAS; it was also partially supported by the Russian Foundation for Basic Research (project no. 20-05-00823).

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Authors and Affiliations

  1. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, Russia

    Ya. B. Radziminovich & V. I. Melnikova

  2. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia

    A. I. Seredkina

  3. Baikal Branch, Geophysical Survey, Russian Academy of Sciences, 664033, Irkutsk, Russia

    N. A. Gileva

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  1. Ya. B. Radziminovich
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Translated by N. Astafiev

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Radziminovich, Y.B., Seredkina, A.I., Melnikova, V.I. et al. The March 29, 2019 Earthquake in the Western Part of the Tunka Rift Basin System: Source Parameters and Macroseismic Effects. Seism. Instr. 56, 648–661 (2020). https://doi.org/10.3103/S0747923920060067

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