A search for source side mantle anisotropy

Details A search for source side mantle anisotropy A search for source side mantle anisotropy

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1049k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 10, May 22, 1992, p. 1049-1052. Research supported by Carnegie Insti

Physics

34

Anisotropic Media, Earth Mantle, S Waves, Seismic Waves, Splitting, Subduction (Geology), Polarization (Waves), Wave Propagation

Scientific paper

The study estimates shear wave splitting due to source-side mantle anisotropy from broadband teleseismic S waves using a suite of 19 subduction zone events. It is found that receiver-side splitting is not detectable below the slab in most cases. Two specific regions, one beneath Peru and one beneath Kamchatka, exhibit significant source-side anisotropy, caused by an associated local disturbance in asthenospheric flow. It is argued that large-scale anisotropy in the lower mantle is very small, probably no more than a fraction of a percent.

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