1988•NASA Technical Reports Server (NASA)Requires access
The earth's geoid and the large-scale structure of mantle convection
Mark A. Richards, Bradford H. Hager
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Abstract
It is shown that most of the earth's low-degree geoid power is derived from density heterogeneity in the lower mantle. Much of the remaining geoid power is due to high-density slabs in active subduction zones. The compensated topography and lithospheric or crustal thickness variations contribute significantly to the observed geoid only for harmonic degrees greater than or equal to 6.