Statistics – Computation
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2527m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 23, p. 2527-2530
Statistics
Computation
5
Earth Gravitation, Geoids, Gravitational Fields, Gravity Anomalies, Mid-Ocean Ridges, Pacific Ocean, Satellite Observation, Southern Hemisphere, Tectonics, Volcanoes, Bathymeters, Mathematical Models, Oceanography, Seasat Satellites, Temperature Effects, Topography
Scientific paper
Shipboard free air gravity and bathymetric anomalies with an extension of 400 km were identified across the Pitcairn-Easter hotline in the South Pacific. The anomalies are associated with one of the positive geoid undulations observed in the area from satellite data. Several smaller topographic features, volcano-tectonic ridges oriented N 65 deg E, are superimposed on the topographic hig. Admittance computations and direct modeling show that the swell topography is compensated by a low density zone within the lithosphere, 4 to 8 km below the crust. The volcano tectonic ridges are locally compensated in a classical Airy sense. The swell and the associated ridges were probably created by the action of a thermal anomaly resulting from the interaction of the Easter Island hotspot and of the Easter Microplate accretion centers.
Dehghani G. A.
Diament Michel
Francheteau Jean
Maia Manuel
Stoffers Peter
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