An inversion for radial viscosity structure using seismic tomography

Details An inversion for radial viscosity structure using seismic tomography An inversion for radial viscosity structure using seismic tomography

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1551k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8534), vol. 19, no. 15, Aug. 3, 1992, p. 1551-1554. Research supported by Green Foundati

Physics

93

Computer Aided Tomography, Earth Mantle, Geoids, S Waves, Seismology, Viscous Fluids, Mathematical Models, Scaling, Velocity Distribution, Viscosity

Scientific paper

Uniform velocity/density scaling has been used to invert the seismically inferred 3-dimensional structure of the whole mantle for the radial viscosity structure which best fits the geoid. 60-72 percent variance reductions are obtained for three different S-wave tomographic models. The resulting viscosity structures are remarkably similar, showing a high viscosity lid, a low viscosity zone in the transition region, and a high viscosity lower mantle. A resolution analysis indicates that the viscosity structure in the upper mantle is well resolved by the data. However, the resolution in the lower mantle is poorer. The models are in general agreement with previous studies except that the inversions prefer a low viscosity layer at 400-670 km as opposed to 100-400 km.

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