Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..122...19y&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 122, Issue 1-2, p. 19-32.
Physics
5
Scientific paper
Group velocities of both Rayleigh and Love waves in the 20-70s period range along paths across Asia and the Eastern Europe are used to obtain group velocity maps of the region. For this purpose, we developed a method for tomographic inversion on spherical surface, which is practically free of a priori assumptions. Checker-board test shows that velocity anomalies of /10°×10° size can be resolved. The `local' dispersion curves are inverted to velocity-depth curves up to 160km depth along three profiles: (1) Tibet, the South China Platform and the southern part of the Japan Sea; (2) the West Siberian Platform, the Tienshan and the Pamir; (3) the East European Platform and the Black Sea Basin. Lateral S-wave velocity variations are presented at the depths of 60, 90 and 120km. A low velocity zone in asthenosphere under Japan Sea is extended under the South China and the North China-Korean Platforms. The upper mantle structure of the Russian (East European) and the West Siberian Platforms is different: a low-velocity zone at 120-140km depths is observed under the West Siberian Platform, whereas the velocity under the Russian Platform increases monotonously with depth. A low velocity layer appears under the Black Sea indicating an oceanic structure of the Basin. Low surface wave velocities in Tibet are caused not only by a thick crust, but also by low S-wave velocities in the upper mantle. The Precambrian West Siberian, North Indian and North China-Korean Platforms are characterized by high velocities at the depth of 120km unlike the younger tectonic units.
Antonova L. M.
Kozhevnikov V. M.
Yanovskaya Tatiana B.
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