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An inversion of geoid and topography for mantle and crustal structure on MarsMars has the largest amplitude geoid anomalies and surface topography known on the terrestrial planets. A number of prior studies have analyzed Martian gravity anomalies and topography in terms of isostasy and flexure of the crust and lithosphere. Other studies have emphasized the role of mantle convection in producing gravity anomalies and topography in some regions of Mars. Geoid and topography observations for simultaneous estimates of density anomalies in the crust and mantle of Mars are inverted. In performing this study, a recent degree 50 spherical harmonic expansion of the Martian gravity field (GMM-l) and a corresponding resolution expansion of the USGS Mars topography model are used. However, our analysis is restricted to harmonic degrees up to L equals 25, which are better determined than the higher harmonics. This provides a half-wavelength horizontal resolution of 425 km.
Document ID
19940011842
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kiefer, Walter
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bills, Bruce
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frey, Herb
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nerem, Steve
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Roark, Jim
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zuber, Maria
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M
Subject Category
Lunar And Planetary Exploration
Accession Number
94N16315
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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