Magsat studies over the Indian region

Details Magsat studies over the Indian region Magsat studies over the Indian region

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ineps..99..619s&link_type=abstract

Indian Academy of Sciences, Proceedings (Earth and Planetary Sciences) (ISSN 0253-4126), vol. 99, Dec. 1990, p. 619-637.

Computer Science

2

Earth Crust, Earth Mantle, Equatorial Regions, India, Magnetic Measurement, Satellite Observation, Earth Observations (From Space), Himalayas, Indian Ocean, Magnetization, Magsat Satellites, Planetary Magnetic Fields, Thematic Mapping

Scientific paper

Data collected by Magsat have been extensively used by Indian scientists in studies of the crust beneath India. Results obtained by various workers have been summarized and the reasons for differences in findings have been discussed. It is concluded that methods that work well for higher latitudes do not give the best estimates of crutal field and magnetization in equatorial regions. A better estimate of the crustal component is obtained when the external current contribution is estimated using the symmetry properties of associated X- and Z-fields. Inversion technique that provides stable crustal magnetization in midlatitudes, becomes unstable near the equator. Why such an instability arises and how it can be circumvented are discussed. That the Peninsular shield, the Ganga basin and the Himalayas are three different geotectonic blocks is clearly reflected in the magnetization distribution. A thick magnetic crust under Aravalli, Singhbum and Dharwar suggest these areas to be comparatively stable. In general, seismic, gravity and heat flow data agree characteristically well with the magnetization estimates.

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