Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..109n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Feb. 1984, p. 109-112.
Physics
126
Anisotropy, Earth Mantle, S Waves, Seismic Waves, Surface Waves, Heterogeneity, Love Waves, Propagation Velocity, Rayleigh Waves, Spherical Harmonics, Subduction (Geology), Tectonics
Scientific paper
Long-period surface waves are used to map lateral heterogeneities of velocity and anisotropy in the upper mantle. The dispersion curves are expanded in spherical harmonics up to degree 6 and inverted to find the depth structure. The data are corrected for the effect of surface layers and both Love and Rayleigh waves are used. Shear wave velocity and shear polarization anisotropy can be resolved down to a depth of about 450 km. The shear wave velocity distribution to 200 km depth correlates with surface tectonics, except in a few anomalous regions. Below that depth the correlation vanishes. Cold subducted material shows up weakly at 350 km as fast S-wave anomalies. In the transition region a large scale pattern appears with fast mantle in the South-Atlantic. S-anisotropy at 200 km can resolve uprising or downwelling currents under some ridges and subduction zones. The Pacific shows a NW-SE fabric.
Anderson David L.
Nakanishi Ichiro
Nataf Henri-Claude
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