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Subcrustal structure of the black sea basin from seismological data

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Abstract

The P-wave travel time data from the earthquakes offshore and onshore around the Black Sea are used for the tomographic reconstruction of the three-dimensional (3D) velocity distribution in the lithosphere of the region. The preliminary refinement of the foci parameters (the coordinates and origin time) has reduced the random errors in the travel-time data. The earthquake data were supplemented by the previous deep seismic sounding (DSS) data on the profiles in Crimea and offshore off the Black Sea. The dataset included more than 4000 travel times overall. In order to eliminate the crustal effect, the travel times were reduced to a surface at a depth of 35 km corresponding to the mean Moho depth in the region. The improved crustal model was used for removing the contribution of the crust from the initial data. The new tomography method, which was recently developed by one of the authors and which relies on the assumption of smoothness of the lateral velocity variations, was applied for reconstructing the velocity structure of the upper mantle beneath the Black Sea up to a depth of 95 km. The lateral velocity variation maps at different depths and the vertical velocity distributions along the meridional and sublatitudinal cross sections across the Black Sea were constructed. High velocities were revealed in the subcrustal lithosphere, and the structural difference below two subbasins—the West Black Sea (WBS) and the East Black Sea (EBS) ones—was established. It shows that the high-velocity body below the WBS is located deeper than below the EBS and is distinguished by higher velocities. Based on these results, it is concluded that the lithosphere beneath the Black Sea has a continental origin.

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Authors and Affiliations

  1. Faculty of Physics, St. Petersburg State University, ul. Ul’yanovskaya 1, Petrodvorets, St. Petersburg, 198594, Russia

    T. B. Yanovskaya

  2. Institute of Seismology and Geodynamics, Vernadskii Crimean Federal University, Crimea, Simferopol, prosp. akad. Vernadskogo 4, 295007, Russia

    V. S. Gobarenko

  3. Institute of Geophysics, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    T. P. Yegorova

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  1. T. B. Yanovskaya
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  2. V. S. Gobarenko
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  3. T. P. Yegorova
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Original Russian Text © T.B. Yanovskaya, V.S. Gobarenko, T.P. Yegorova, 2016, published in Fizika Zemli, 2016, No. 1, pp. 15–30.

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Yanovskaya, T.B., Gobarenko, V.S. & Yegorova, T.P. Subcrustal structure of the black sea basin from seismological data. Izv., Phys. Solid Earth 52, 14–28 (2016). https://doi.org/10.1134/S1069351316010109

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