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Russian Geology and Geophysics

2018 year, number 4

DISPERSION OF GROUP VELOCITIES OF RAYLEIGH AND LOVE WAVES AND ANISOTROPIC PROPERTIES OF THE ASIAN CONTINENT

A.I. Seredkina, V.M. Kozhevnikov, O.A. Solovei
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
Keywords: Волны Рэлея, волны Лява, групповые скорости, поверхностно-волновая томография, вертикальная анизотропия, азиатский континент, Rayleigh and Love waves, group velocities, surface wave tomography, vertical anisotropy, Asian continent

Abstract

We have studied the structures of the Earth’s crust and upper mantle of the Asian continent using a representative sample of dispersion curves of group velocities of fundamental-mode Rayleigh and Love waves for more than 3200 seismic paths. Maps of distribution of variations in group velocities with periods of 10 to 250 s over a spherical surface were compiled by the 2D tomography method. The maps reflect the deep structure of the Earth’s crust and upper mantle of the study area and give a tentative idea of the horizontal distribution of the anisotropic properties of the mantle matter. The obtained data are confirmed by the calculations of the velocity profiles of SV and SH waves for the entire Asian continent and for its regions. Vertically, anisotropy is observed to depths of ~250 km, with its maximum in the depth range from the bottom of the crust to 150 km.