Mathematics – Logic
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..421i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, June 1983, p. 421-423. Sponsorship: U.S. Geological Survey.
Mathematics
Logic
1
Earth Gravitation, Earth Mantle, Geoids, Geomagnetism, Gravity Anomalies, Computerized Simulation, Earth Crust, Indian Ocean
Scientific paper
The broad gravity low in the equatorial Indian Ocean south of Sri Lanka is the largest and most striking feature in the gravitational field of the earth. The most negative long-wavelength free-air gravity anomalies are found there and the sea surface (geoid) lies more than 100 meters below the best fitting ellipsoid. A model of the lithosphere and upper mantle is proposed which accurately predicts the observed free-air gravity and geoid elevation. This model is consistent with bathymetry and sediment thickness data and suggests that the crust south of India currently floats as much as 600 meters lower than would be expected if the region were isostatically compensated. This residual depression of the crust is apparently confirmed by observations of ocean depth. An uncompensated depression is consistent with the presence of a mechanical wake left in the upper mantle behind India as it traveled toward Asia.
Ihnen S. M.
Whitcomb J. H.
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