Global patterns of azimuthal anisotropy and deformations in the continental mantle

Details Global patterns of azimuthal anisotropy and deformations in the continental mantle Global patterns of azimuthal anisotropy and deformations in the continental mantle

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geoji.111..433v&link_type=abstract

Geophysical Journal International (ISSN 0956-540X), vol. 111, no. 3, p. 433-447.

Physics

196

Earth Crust, Earth Mantle, Earth Movements, Plates (Tectonics), Anisotropy, Azimuth, Fourier Transformation, S Waves

Scientific paper

Measurements of azimuthal anisotropy in the continental mantle based on the SKS technique are reported. Data on the directions of polarization of the fast quasi-shear wave and the time delays between the quasi-shear waves, obtained at nearly 70 locations in all continents, except Antarctica, are interpreted in terms of the lattice-preferred orientation of olivine caused by deformations in the mantle. The data suggest that the depth interval responsible for anisotropy is at least 300 km. The fast directions in SKS do not show clear correlation with the fast directions of the teleseismic P at the same seismograph stations.

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