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Crustal Structure of the Crimean Mountains along the Sevastopol–Kerch Profile from the Results of DSS and Local Seismic Tomography

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Abstract

The paper discusses the velocity structure of the crust beneath the Crimean Mountains from the results of active and passive seismic experiments. Based on a new interpretation of seismic data from the old Sevastopol–Kerch DSS profile by modern full-wave seismic modeling methods, a velocity model of the crust beneath the Crimean Mountains has been constructed for the first time. This model shows the significant differences in the structure of two crustal blocks: (1) one characterized by higher velocities and located in the western and central Crimean Mountains, and (2) the other characterized by lower velocities and located in the east, in the Feodosiya–Kerch zone, which are subdivided by a basement uplift (Starokrymskoe Uplift). The former block is characterized by a more complex structure, with the Moho traced at depths of 43 and 55 km, forming two Moho discontinuities: the upper one corresponds to the platform stage, and the lower one, formed presumably at the Alpine stage of tectogenesis as a result of underthrusting of the East Black Sea microplate beneath the southern margin of the Scythian Plate in Crimea. At depths of 7–11 km, velocity inversion zone has been identified, indicating horizontal layering of the crust. Local seismic tomography using the data on weak earthquakes (mb ≤ 3) recorded by the Crimean seismological network allowed us to obtain data on the crustal structure beneath the Crimean Mountains at depths of 10–30 km. The crustal structure at these depths is characterized by the presence of several high-velocity crustal bodies in the vicinity of cities Yalta, Alushta, and Sudak, with earthquake hypocenters clustered within these bodies. Comparison of this velocity model of the Crimean Mountains with the seismicity distribution and with the results from reconstruction of paleo- and present-day stress fields from field tectonophysical study and earthquake focal mechanisms allowed the conclusion that the Crimean Mountains were formed as a result of on mature crust at the southern margin of the East European Platform and Scythian Plate, resulting from processes during various phases of Cimmerian and Alpine tectogenesis in the compressional and transpressional geodynamic settings. The collisional process is ongoing at the present-day stage, as supported by high seismicity and uplift of the Crimean Mountains.

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Authors and Affiliations

  1. Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Kiev, 03680, Ukraine

    T. P. Yegorova, E. P. Baranova & A. V. Murovskaya

  2. Vernadsky Crimean Federal University, Institute of Seismology and Geodynamics, Simferopol, 295007, Russia

    V. S. Gobarenko

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  1. T. P. Yegorova
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  2. E. P. Baranova
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  3. V. S. Gobarenko
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  4. A. V. Murovskaya
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Correspondence to T. P. Yegorova.

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Original Russian Text © T.P. Yegorova, E.P. Baranova, V.S. Gobarenko, A.V. Murovskaya, 2018, published in Geotektonika, 2018, No. 4, pp. 77–95.

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Yegorova, T.P., Baranova, E.P., Gobarenko, V.S. et al. Crustal Structure of the Crimean Mountains along the Sevastopol–Kerch Profile from the Results of DSS and Local Seismic Tomography. Geotecton. 52, 468–484 (2018). https://doi.org/10.1134/S0016852118040027

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