Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..287t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, April 1984, p. 287-290.
Physics
91
Convection, Earth Mantle, Geodynamics, Love Waves, Planetary Mapping, Rayleigh Waves, Anisotropy, Geoids, Phase Velocity, Plates (Tectonics)
Scientific paper
Long-period (100-250 sec.) Love and Rayleigh waves are used to map heterogeneity and azimuthal anisotropy in the upper mantle. Spherical harmonic descriptions of anisotropy up to l = m = 3 and 2 theta are derived. Azimuthal anisotropy obtains values as high as 1.5 percent. There is good correlation of fast Rayleigh wave directions with upper mantle return flow directions derived from kinematic considerations. This is consistent with a-axis of olivine being aligned in the flow direction. The main differences between the flow models and the Rayleigh wave azimuthal variation maps occur in the vicinity of hotspots. The correlation of azimuthal anisotropy with upper mantle return flow directions, rather than with plate directions, suggests that part of the return flow is in the upper mantle and this, in turn, implies a low viscosity channel.
Anderson David L.
Tanimoto Toshiro
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