Physics – Geophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6241l&link_type=abstract
Journal of Geophysical Research, vol. 84, Oct. 10, 1979, p. 6241-6247.
Physics
Geophysics
3
Earth (Planet), Mars (Planet), Planetary Gravitation, Topography, Earth Gravitation, Gravitational Fields, Gravity Anomalies, Lithosphere, Power Spectra, Space Exploration, Mars, Gravity, Topography, Comparisons, Gravity Fields, Lithosphere, Thickness, Geophysics, Density, Anomalies, Crust, Stress, Harmonics, Isostasy, Tharsis Region, Mantle, Earth, Data, Spectrum, Shear
Scientific paper
The long-wavelength variations in Martian and terrestrial potential and topography are compared in an attempt to understand the origin of the Martian gravitational field and to estimate the average thickness of the Martian lithosphere. The gravitational and topographic power spectra of Mars are observed to contain more power in the low-degree harmonics than those of earth, in accordance with the way stresses vary between planets, and to exhibit a positive correlation for low degrees. Considerations of the correlation of gravity with topography and isostatic compensation lead to the conclusion that a lithosphere 200 to 300 km thick can support density anomalies required to explain the observed potential for degrees greater than three, without stresses exceeding those associated with the earth's topography. Lower degree harmonics (two or three) of the gravitation and topography are considered to describe essentially the Tharsis plateau, which requires a lithospheric thickness of 400 km or an as yet undeterminable alternative support mechanism.
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