Polarization anisotropy and fine-scale structure of the Eurasian upper mantle

Details Polarization anisotropy and fine-scale structure of the Eurasian upper mantle Polarization anisotropy and fine-scale structure of the Eurasian upper mantle

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..824g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 824-827. Research supported by the MacArthur Foundation an

Physics

21

Earth Mantle, Earth Planetary Structure, Earthquakes, Seismology, Anisotropy, Asia, Europe, S Waves, Time Response

Scientific paper

The travel times of direct and multilply reflected S waves and fundamental-mode surface waves were measured on 40 three-component records from the Global Digital Seismic Network stations KONO and GRFO for two corridors across Eurasia (the Northern and the Southwestern corridors). Shear-wave splitting of multiply reflected S waves bottoming in the upper mantle beneath the Russian and Siberian platforms was observed. The dispersion of Love and Rayleigh waves over these paths shows discrepancies with respect to smooth isotropic structures, consistent with a model of the uppermost mantle with significant apparent vertical anisotropy. The apparent anisotropy associated with fine-scale ('rough') structure beneath stable Eurasia was examined by fitting the data with a rough isotropic model having an rms shear velocity fluctuation varying from 14 percent in the uppermost mantle to zero at 400-km depth. These fluctuations are considered to signify the existence of intrinsic (local) anisotropy.

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