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GEOPHYSICAL RESEARCH LETTERS,
VOL. 19, NO. 15,
PAGES 1551–1554,
1992
AN INVERSION FOR RADIAL VISCOSITY STRUCTURE USING SEISMIC TOMOGRAPHY
Scott D. King
Institute of Geophysics and Planetary Physics, UCSD
Guy Masters
Institute of Geophysics and Planetary Physics, UCSD
Abstract
Using a uniform velocity/density scaling, we have inverted the seismically inferred 3-dimensional structure of the whole mantle
for the radial viscosity structure which best fits the geoid. We are able to obtain 60–72% variance reductions 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 indcates that the viscosity structure
in the upper mantle is well resolved by the data, however the resolution in the lower mantle is poorer. Our models are in
general agreement with previous studies except that our inversions prefer a low viscosity layer at 400–670 km as opposed to
100–400 km.
Received 20
March
1992;
accepted 9
July
1992.
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Citation: King, S. D., and G. Masters
(1992),
AN INVERSION FOR RADIAL VISCOSITY STRUCTURE USING SEISMIC TOMOGRAPHY,
Geophys. Res. Lett.,
19(15),
1551–1554.
Copyright 1992 by the American Geophysical Union.
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