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Gravity anomalies, compensation mechanisms, and the geodynamics of western Ishtar Terra, VenusPioneer 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 z sub 0. The apparent depth of isostatic compensation at z sub 0 = 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.
Document ID
19910051926
Document Type
Reprint (Version printed in journal)
Authors
Grimm, Robert E. (Southern Methodist Univ. Dallas, TX, United States)
Phillips, Roger J. (Southern Methodist University Dallas, TX, United States)
Date Acquired
August 15, 2013
Publication Date
May 10, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAGW-459
Distribution Limits
Public
Copyright
Other