Gravity anomalies, compensation mechanisms, and the geodynamics of western Ishtar Terra, Venus

Details Gravity anomalies, compensation mechanisms, and the geodynamics of western Ishtar Terra, Venus Gravity anomalies, compensation mechanisms, and the geodynamics of western Ishtar Terra, Venus

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.8305g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 10, 1991, p. 8305-8324.

Physics

45

Geodynamics, Gravity Anomalies, Instrument Compensation, Planetary Gravitation, Venus Surface, Geoids, Minimum Variance Orbit Determination, Planetary Geology, Topography

Scientific paper

Pioneer Venus line-of-sight orbital accelerations were utilized to calculate the geoid and vertical gravity anomalies for western Ishtar Terra on various planes of altitude z0. The apparent depth of isostatic compensation at z0 = 1400 km is 180 + or - 20 km based on the usual method of minimum variance in the isostatic anomaly. An attempt is made here to explain this observation, as well as the regional elevation, peripheral mountain belts, and inferred age of western Ishtar Terra, in terms of one or three broad geodynamic models.

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