Small-scale mantle convection system and stress field under the Pacific plate |
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Authors: | Edward S. Chang George H. Wyatt |
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Affiliation: | 1. Geodynamics Branch, Goddard Space Flight Center, Greenland, Md. 20771 U.S.A.;2. Wolf Research and Development Group, Riverdale, Md. 20840 U.S.A. |
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Abstract: | The existence of nonhydrostatic high-degree harmonics in the gravitational field of the earth has recently been determined using satellite and gravity observations. In this paper, we have applied the Goddard Space Flight Center GEM-8 gravity field model to calculate the small-scale mantle flow system under the Pacific plate. The resulting tectonic forces or stresses exerted by the flow currents show tensional forces under the Hawaiian Island chain and a system of latitudinal convection rolls under the East Pacific plate and are in agreement with geophysical theories. |
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