Elastic thickness of the Venus lithosphere estimated from topography and gravity

Details Elastic thickness of the Venus lithosphere estimated from topography and gravity Elastic thickness of the Venus lithosphere estimated from topography and gravity

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1039c&link_type=abstract

Geophysical Research Letters, vol. 8, Oct. 1981, p. 1039-1042.

Physics

7

Elastic Properties, Gravity Anomalies, Lithosphere, Planetary Structure, Planetology, Topography, Venus Surface, Flexing, Isostatic Pressure, Pioneer Venus 1 Spacecraft, Aphrodite Terra, Earth, Highlands, Venus, Lithosphere, Thickness, Pvo, Topography, Gravity, Pioneer Venus Orbiter, Analysis, Data, Anomalies, Features, Models, Elastic Properties, Stress, Wavelengths, Compensation, Amplitude, Comparisons, Gravity Fields, Depth, Isostasy, Deformation, Maps, Layers, Density, Plains, Mapping

Scientific paper

The state of isostatic compensation of topographic features of lateral extent less than or equal to 100 km on the surface of Venus is investigated within the framework of lithospheric flexure theory. A region of the equatorial rolling plains province covered by the high-resolution gravity map of Sjogren et al. (1980) obtained from Pioneer Venus Orbiter Doppler radio data is analyzed by comparison with gravity anomalies computed from the contour maps of Masursky et al. (1980) and Pettengill et al. (1980) on the basis of a model of Airy-type local isostatic compensation. The observed anomaly maxima are found to exceed those computed assuming perfect local compensation by over a factor of two, and to be better explained by a model of compensation including elastic forces within the lithosphere which contribute to the support of topographic loads through elastic stresses. Results indicate that the flexural rigidity of the Venus lithosphere in the rolling plains province is very low (about 4 x 10 to the 28th dyne cm), suggesting that small topographic features are supported by a combination of lithospheric elastic flexure and local isostatic compensation. An elastic layer thickness of the lithosphere of 7.5 plus or minus 1 km is then derived for the region, which may not be representative of the entire Venus lithosphere.

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