Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1229s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1229
Physics
1
Coronae, Elastic Thickness, Gravity, Venus
Scientific paper
Coronae are circular features on Venus that are defined by their fracture annuli. Many coronae have a moat and outer rise encircling the interior dome, plateau or depression. The topography of these outer rises have been fit with a flexure model to obtain an estimate of the elastic thickness. Such estimates are potentially of value for constraining both models of coronae formation and the thermal history of Venus. Namiki and Solomon have shown that coronae are likely to be younger than the average surface age of Venus. Elastic thickness estimates for coronae may thus reflect the current state of the lithosphere. The new 90 degree and order spherical harmonic gravity field for Venus provides sufficient resolution to estimate elastic thickness in some regions via modeling of the gravity/topography admittance spectrum. Initial estimates of the elastic thickness for Heng-o and Artemis Coronae yield values of ~30 km and ~23 km, respectively. These values of elastic thickness are at the lower end or smaller than the estimates of 30-45 km and 30-45 km for Heng-o and Artemis, respectively, obtained by modeling of the topography alone.
Smrekar Suzanne E.
Yu Jie-Sheng
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