Gravity and lithospheric stress on the terrestrial planets with reference to the Tharsis region of Mars

Details Gravity and lithospheric stress on the terrestrial planets with reference to the Tharsis region of Mars Gravity and lithospheric stress on the terrestrial planets with reference to the Tharsis region of Mars

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4469s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 10, 1985, p. 4469-4489.

Other

74

Geoids, Isostatic Pressure, Lithosphere, Mars (Planet), Planetary Gravitation, Terrestrial Planets, Cartesian Coordinates, Modulus Of Elasticity, Poisson Ratio, Venus (Planet), Mars, Gravity Properties, Lithosphere, Terrestrial Planets, Planets, Tharsis Region, Analsysis, Theoretical Studies, Isostacy, Compensation, Stress, Rotation, Ellipticity, Fractures, Age, Hypotheses, Flexure, Models, Mantle, Density, Relaxation

Scientific paper

On Mars and Venus, a strong positive correlation is found between geoid height and topography. The Tharsis region of Mars provides an exhibition of this correlation. Several hypotheses have been proposed regarding the origin of Tharsis. For purposes of explanation, three end-member dynamic hypotheses are considered. A hypothesis that the flexural doming of Tharsis resulted from uplift caused by some force acting on the base of the lithosphere can be rejected. According to another hypothesis, Tharsis is associated with a lithospheric load, while a third one considers that Tharsis is primarily isostatically compensated. In the present study, improved stress models for isostatic compensation on Mars are obtained. The strains inferred from fracture patterns on Mars are compared with the stresses predicted by the isostatic theory. It is found that the computed stresses are in reasonable agreement with tectonic features on Mars.

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