Density-versus-depth models from multimode surface waves

Details Density-versus-depth models from multimode surface waves Density-versus-depth models from multimode surface waves

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..633c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, July 1984, p. 633-636. Research supported by the Institut National d'Ast

Astronomy and Astrophysics

Astronomy

13

Earth Mantle, Elastic Waves, Seismic Waves, Surface Waves, Isotropy, Love Waves, North America, P Waves, Pacific Ocean, Phase Velocity, Rayleigh Waves, S Waves

Scientific paper

Multimode Love and Rayleigh wave data related to the Pacific Ocean and to North America are inverted using two sets of parameters: (1) the isotropic P and S velocities plus the density and (2) five elastic parameters describing a transversely isotropic medium, plus the density. It is found that the assumption of isotropy leads to very unrealistic upper-mantle models while much more realistic models are obtained under the assumption of transverse isotropy. The lateral variations in density between the Pacific Ocean and North America are then less than 1.5 percent and, in both regions, a large density gradient is well resolved at a depth near 360 km.

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