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Using earthquake records, dispersion curves of group velocities of Rayleigh and Love waves were constructed in the interval periods of 10–100 s along the traces crossing the European continent. Lateral variations of SV and SH wave velocities were obtained from these data, local dispersion curves were converted into velocity sections of SV and SH waves (2D + 1D inversion), and the spatial distribution of the radial anisotropy coefficient was analysed. It is shown that in the vicinity of Vsh/Vsv = 1, i.e. under conditions of weak anisotropy, the radial anisotropy coefficients proposed by different authors have close values and can be approximated by a linear function. The SH and SV wave velocity distributions show that the upper mantle of Europe is extremely heterogeneous. In addition to the high-velocity East European Platform (EEP) mantle, a low-velocity West European Platform (WEP) mantle is observed at depths of up to 150 km. The transition from high velocities beneath the EEP to lower velocities beneath the WEP is marked by the Tornquist-Teisseyre Zone. At depths of up to 100 km, a low-velocity zone is traced beneath the Pannonian Basin. The Pannonian Basin is made up of a thin crust (up to ∼26–27 km) and a “thinned” lithosphere (∼60–70 km). It also has anomalously high values of heat flux. The mantle of the sub-Atlantic regions and the Alpine belt is especially low velocity. The spatial distribution of the anisotropy coefficient shows that the mantle of Europe is also markedly anisotropic, especially in the subcrustal part up to depths of 70–75 km. It should be noted that the areas of the Black Sea, Anatolia, the Eastern Mediterranean and the Balearic Islands exhibit an anisotropy coefficient of less than 1%, which permits the conclusion that the mantle state is approaching isotropy. Areas with VSV dominating over VSH were identified: the North Sea area, the Black Sea region and the Balearic Sea area. The results show that the mantle becomes less anisotropic with depth. By 200 km, the average anisotropy coefficient is around 1%.

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On the Peculiarities of the Radial Anisotropy Distribution in the European Region from Surface Wave Tomography

  • 会议论文

  • 发表日期：

    2026年

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  • Konstantin Sannikov,
  • Evgeniya Lyskova,
  • Alexander Sannikov

摘要

Using earthquake records, dispersion curves of group velocities of Rayleigh and Love waves were constructed in the interval periods of 10–100 s along the traces crossing the European continent. Lateral variations of SV and SH wave velocities were obtained from these data, local dispersion curves were converted into velocity sections of SV and SH waves (2D + 1D inversion), and the spatial distribution of the radial anisotropy coefficient was analysed. It is shown that in the vicinity of Vsh/Vsv = 1, i.e. under conditions of weak anisotropy, the radial anisotropy coefficients proposed by different authors have close values and can be approximated by a linear function. The SH and SV wave velocity distributions show that the upper mantle of Europe is extremely heterogeneous. In addition to the high-velocity East European Platform (EEP) mantle, a low-velocity West European Platform (WEP) mantle is observed at depths of up to 150 km. The transition from high velocities beneath the EEP to lower velocities beneath the WEP is marked by the Tornquist-Teisseyre Zone. At depths of up to 100 km, a low-velocity zone is traced beneath the Pannonian Basin. The Pannonian Basin is made up of a thin crust (up to ∼26–27 km) and a “thinned” lithosphere (∼60–70 km). It also has anomalously high values of heat flux. The mantle of the sub-Atlantic regions and the Alpine belt is especially low velocity. The spatial distribution of the anisotropy coefficient shows that the mantle of Europe is also markedly anisotropic, especially in the subcrustal part up to depths of 70–75 km. It should be noted that the areas of the Black Sea, Anatolia, the Eastern Mediterranean and the Balearic Islands exhibit an anisotropy coefficient of less than 1%, which permits the conclusion that the mantle state is approaching isotropy. Areas with VSV dominating over VSH were identified: the North Sea area, the Black Sea region and the Balearic Sea area. The results show that the mantle becomes less anisotropic with depth. By 200 km, the average anisotropy coefficient is around 1%.