Journal of Seismology

, Volume 2, Issue 4, pp 303–316 | Cite as

Structure of the crust in the Black Sea and adjoining regions from surface wave data

  • T. B. Yanovskaya
  • E. S. Kizima
  • L. M. Antonova


Group velocities of Rayleigh and Love waves along the paths across the Black Sea and partly Asia Minor and the Balkan Peninsula are used to estimate lateral variations of the crustal structure in the region. As a first step, lateral variations of group velocities for periods in the range 10–20 s are determined using a 2D tomography method. Since the paths are oriented predominantly in NE–SW or N–S direction, the resolution is estimated as a function of azimuth. The ‘local’ dispersion curves are actually averaged over the extended areas stretched in the predominant direction of the paths. The size of the averaging area in the direction of the best resolution is approximately 200 km. As a second step, the local averaged dispersion curves are inverted to vertical sections of S-wave velocities. Since the dispersion curves in the 10–20 s period range are mostly affected by the upper crustal structure, the velocities are estimated to a depth of approximately 25 km. Velocity sections along 43° N latitude are determined separately from Rayleigh and Love wave data. It is shown that the crust under the sea contains a low-velocity sedimentary layer of 2–3 km thickness, localized in the eastern and western deeps, as found earlier from DSS data. Beneath the sedimentary layer, two layers are present with velocity values lying between those of granite and consolidated sediments. Velocities in these layers are slightly lower in the deeps, and the boundaries of the layers are lowered. S-wave velocities obtained from Love wave data are found to be larger than those from Rayleigh wave data, the difference being most pronounced in the basaltic layer. If this difference is attributed to anisotropy, the anisotropy coefficient χ = (SH - SV)/Smean is reasonable (2–3%) in the upper layers, and exceeds 9% in the basaltic layer.

Black Sea crustal structure group velocity surface waves tomography 


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  1. Andrieux, J., Semir Over, Poisson, A., Bellier, O., 1995, The North Anatolian fault zone: distributed Neogen deformation in its northward convex part, Tectonophysics 243, 135–154.Google Scholar
  2. Backus, G. and Gilbert, F., 1968, The resolving power of gross Earth data, Geophys. J. Roy. Astr. Soc. 16, 169–205.Google Scholar
  3. Boulange, Yu. D., Muratov, M. V., Subbotin, S. I., Balavadze, V. K. (eds), 1975, The Earth's crust and history of evolution of the Black Sea depression, Moscow, Nauka (in Russian).Google Scholar
  4. Ditmar, P. G., Yanovskaya, T. B., 1987, Generalization of Backus-Gilbert method for estimation of lateral variations of surface wave velocities, Physics of the Solid Earth, Izvestia Acad. Sci. USSR 23 (6), 470–477.Google Scholar
  5. Golmstok, A. Ya., Zonnenshain, L. P., Terekhov, A. A. and Shainurov, R. V., 1992, Age, thermal evolution and history of the Black Sea Basin based on heat flow and multichanneled reflection data, Tectonophysics 210 (3–4), 273–293.Google Scholar
  6. Kogan, L. I., Malovitsky, Ya. P., Moskalenko, V. N., Shimkus, K. M., 1977, New data on the structure of sedimentary layer in Black Sea southern of Crimea, Dokl. AN SSSR 233 (3), 450–452 (in Russian).Google Scholar
  7. Malovitsky, Ya. P., Neprochnov, Yu. P., 1966, Comparison of seismic and gravimetric data on the Earth's crust structure in the Black Sea depression. In: Structure of the Black Sea Depression, Moscow, Nauka, 5–16 (in Russian).Google Scholar
  8. Mindeli, P. Sh., Neprochnov, Yu. P., Pataraya, E. I., 1965, Determination of ‘granic layer’ absence in the Black Sea depression from both DSS and seismological data, Izv. AN SSSR, ser. geol. 2, 7–15 (in Russian).Google Scholar
  9. Milanovsky, E. E., 1967, Problem of origin of the Black Sea depression and its place in the structure of the Alpine belt, Vestnik MGU, ser. geol. 1, 27–43 (in Russian).Google Scholar
  10. Muyzert, E., Paulssen, H., Snieder, R., 1998, A seismic cross section through the East European continent (submitted to Geoph. J. Int.).Google Scholar
  11. Nishimura, C. L. and Forsyth, D. W., 1989, The anisotropic structure of the upper mantle in the Pacific, Geoph. J. Int. 96, 203–229.Google Scholar
  12. Ritzwoller, M. H., Levshin, A. L., 1998, Eurasian surface wave tomography: group velocities, J. Geoph. Res. 103, 4839–4868.Google Scholar
  13. Tugolessov, D. A., Gorshkov, A. S., Meysner, L. B. and Khakhalev, E. M., 1985, Tectonics of Mesozoic and Cenozoic Deposits of the Black Sea Basin, Moscow, Nedra (in Russian).Google Scholar
  14. Zonnenshain, I. P., Le Pichon, X., 1986, The Black Sea and Caspian Sea deep basins as remnants of Mesozoic back arc basins, Tectonophysics 123, 181–211.Google Scholar
  15. Yanovskaya, T. B., 1997, Resolution estimation in the problems of seismic ray tomography, Izvestia, Physics of the Solid Earth 33 (9), 762–765.Google Scholar
  16. Yanshin, A. L., Malovitsky, Ya. P., Moskalenko, V. N., Shimkus, K. M., Shlezinger, A. E., 1976, The main aspects of the Black Sea genesis, Dokl. AN SSSR 229 (1), 178–181 (in Russian).Google Scholar

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • T. B. Yanovskaya
    • 1
  • E. S. Kizima
    • 2
  • L. M. Antonova
    • 2
  1. 1.Institute of Physics, St. Petersburg University, PetrodvoretzSt. PetersburgRussia
  2. 2.Institute of Physics, St. Petersburg University, PetrodvoretzSt. PetersburgRussia

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