Geophysical implications of the Martian gravity field

Details Geophysical implications of the Martian gravity field Geophysical implications of the Martian gravity field

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..313a&link_type=abstract

Icarus, vol. 26, Nov. 1975, p.313-320.

Astronomy and Astrophysics

Astronomy

1

Gravitational Effects, Mars Environment, Planetary Gravitation, Potential Fields, Topography, Astronomical Models, Density Distribution, Mars Surface, Spherical Harmonics, Stress Distribution

Scientific paper

The undulations of the Martian gravitational potential indicate lateral density variations in the Mars interior. A gravitating and solid Martian model deforms under the influence of these variations, producing stress differences of about 125 bars at a depth of about 200 km. Introduction of a partially molten core of 1300 km radius does not affect the stress distribution in the mantle significantly, whereas the assumption of a partially molten asthenosphere underlying a solid lithosphere of about 300 km increases the stress differences appreciably. A strong linear correlation of the gravitational potential and the surface topography indicates that the extensive volcanism at the Tharsis region is a recent phenomenon. The high stresses associated with this region imply that there has been no extensive molten region within the upper 300 km since the volcanism.

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