Computer Science
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..399g&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 399.
Computer Science
Venus Surface, Structural Basins, Gravity Anomalies, Planetary Mantles, Basalt, Planetary Crusts, Planetary Gravitation, Topography, Spherical Harmonics
Scientific paper
With a diameter of about 1500 km and a depth of about 2 km, Atalanta planitia is one of the largest and deepest basins on Venus. It is nearly circular and comparable in size to Beta regio, but has a remarkably smooth topography. The apparent depth of compensation analysis performed both in the space and the spectral domains using the spherical harmonic coefficients of degree of up to 120 suggests that Atalanta planitia is the result of either a broad upper mantle downwelling or a delaminated material sinking underneath. The long wavelength features (more than 800 km) are partly dynamically compensated at depths around 120 to 160 km, and partly compensated by accumulation of high-density basaltic material at a depth of about 60 km, resulting from crustal thickening. The short wavelength features (less than 600 km), are mostly compensated at a depth of about 20 km, the average crustal thickness in that region.
Arkani-Hamed Jafar
Gauthier Michel
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