Thermal isostasy in the South Atlantic Ocean from geoid anomalies

Details Thermal isostasy in the South Atlantic Ocean from geoid anomalies Thermal isostasy in the South Atlantic Ocean from geoid anomalies

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..280k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 2-3, July 1985, p. 280-290.

Computer Science

10

Atlantic Ocean, Geoids, Gravity Anomalies, Planetary Temperature, Isostasy, Seasat Satellites, Southern Hemisphere, Tectonics, Topography

Scientific paper

Transfer functions (admittances) were computed for the main tectonic units of the South Atlantic Ocean using the detailed Seasat geoid. Ensemble averaging in the two-dimensional wavenumber domain was applied. The topography of the Walvis Ridge and Rio Grande Rise visually correlates with the local geoid, i.e., the difference between the total Seasat geoid and first ten harmonics of the GRIM 3 model. The mid-Atlantic geoid visually correlates with the total geoid. Sea-gravimetry was used to evaluate the contribution of mechanical isostasy to the geoid. Admittances computed from the geoid and from gravimetry data agree well in the short waveband (wavelengths shorter than 300 km). A deviation at longer wavelengths is found between the observed admittance and the one due to mechanical isostasy for the southwestern Walvis Ridge. It is explained with a density perturbation at about 20 km deep. The admittance for the Mid-Atlantic Ridge is interpreted in terms of a boundary layer model and an average thickness of 30 km for the thermal lithosphere is obtained.

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