Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2..321r&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 2, May-June 1984, p. 321-331.
Physics
Convection Currents, Earth Gravitation, Earth Mantle, Gravimetry, Gravity Anomalies, Lithosphere, Asia, Pacific Ocean, Satellite Tracking, South America, Subduction (Geology)
Scientific paper
Gravity data from previous studies are summarized in an examination of convection driven in a subducting environment. The study was in part spurred by a high correlation between the gravity or geoid anomalies of satellite orbit models such as the GEM 10B and known subduction lines. Central and South American gravity profiles reveal a linear negative slope toward the interior of a plate, an absolute maximum near and landward of a trench, and an absolute minimum 3500 km from the trench. Attention is given to the influences of a secondary maximum, the long-wave decreasing slope and the amplitude of the primary maximum, and to the regional contribution to gravity by viscous coupling of the sinking slab. The sinking slab drives a convection current across most tectonic plates. The secondary maximum is then associated with an upwelling current of the convective circulation. An analytical model of the processes is presented and furnishes a rough approximation of the observed anomalies.
Lago Bernard
Rabinowicz Michel
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