Computer Science
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48...15c&link_type=abstract
Earth and Planetary Science Letters, vol. 48, no. 1, June 1980, p. 15-22.
Computer Science
42
Geoids, Geopotential, Lithosphere, Africa, Density Distribution, Earth Axis, Earth Surface, Height, Maps, Pacific Ocean, Slabs, Structural Properties (Geology), Subduction (Geology)
Scientific paper
The earth's largest positive geoid height anomalies are associated with subduction zones and hotspots. Although the correlation with subduction has been noted for many years, the correlation with hotspots is fully evident only when the subduction-related geoid highs are removed from the observed field. Using the assumption that subducted lithospheric slabs are uncompensated and are thermally re-equilibrated with the asthenosphere at the maximum depth of earthquakes, the expected geoid anomaly over subduction zones is calculated. This field provides a satisfactory fit to the observed circum-Pacific high. Subtraction of this predicted anomaly leaves a residual field which is correlated, at greater than the 99% confidence level, with the distribution of hotspots. Broad residual geoid highs occur over the central Pacific and the Africa/eastern Atlantic regions, the same areas where the hotspots are concentrated. The mass anomalies associated with hotspots and subducted slabs apparently control the location of the earth's spin axis.
Crough Thomas S.
Jurdy Donna M.
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