Mars: Hellas Planitia gravity analysis |
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Authors: | William L Sjorgren Raymond N Wimberley |
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Institution: | Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91103, USA |
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Abstract: | Doppler radio tracking data from Viking Orbiter 1 has provided new detailed observations of gravity variations over Hellas Planitia. Line-of-sight Bouguer gravity definitely indicates that isostatic adjustment has occurred. Two theoretical models were tested to obtain fits to the gravity data. Results for a surface deficit model, and a model with a surface deficit and a mass excess at depth are displayed. The mass-at-depth model produced very marked improvement in the data fit as compared to the surface deficit model. The optimum depth for the mass excess is 130 km. |
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