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3 edition of An inversion of gravity and topography for mantle and crustal structure on Mars found in the catalog.

An inversion of gravity and topography for mantle and crustal structure on Mars

An inversion of gravity and topography for mantle and crustal structure on Mars

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Gravitation.,
  • Topography.,
  • Mars surface.,
  • Planetary mantles.,
  • Temperature distribution.,
  • Thickness.

  • Edition Notes

    StatementWalter S. Kiefer, Bruce G. Bills, R. Steven Nerem.
    Series[NASA contractor report] -- NASA-CR-204591.
    ContributionsBills, Bruce G., Nerem, R. Steven, 1960-, United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15485839M

    Figure 1. Global maps of (A) topography, (B) free-air gravity and (C) crustal thickness (7) of Mars (Mercator projection). On all panels the Tharsis province is centered near the equator in the longitude range ° E to ° E and contains the east-west trending Valles Marineris canyon system and the major volcanic shields Olympus Mons (18° N, ° E), Alba Patera (42° N, ° E. Using Gravity and Topography to Map Mars' Crustal Thickness Ma Newly detailed mapping of local variations in Mars' gravitational pull on orbiters (center), combined with topographical mapping of the planet's mountains and valleys (left) yields the best-yet mapping of Mars' crustal .

    47! density, crustal thickness, mantle density and basal normal stress at the model bottom, to 48! the last of which we apply the unevenly defined term "dynamic topography." The mantle 49! component of topography arises from variations in the density and thickness of the 50! mantle Size: 3MB.   () , – doi: /gji/ggz Advance Access publication March 6 GJI Gravity, geodesy and tides A global reference model of the lithosphere and upper mantle from joint inversion and analysis of multiple data sets Juan Carlos Afonso,1,2 Farshad Salajegheh,1 Wolfgang Szwillus,3 Jorg Ebbing3 and Carmen Gaina2 1Australian.

    [1] The topography of a terrestrial planet can be supported by several mechanisms: (1) crustal thickness variations, (2) density variations in the crust and mantle, (3) dynamic support, and (4) lithospheric stresses. Each of these mechanisms could play a role in compensating topography on Venus, and we distinguish between these mechanisms in part by calculating geoid‐to‐topography . The gravity of Mars is a natural phenomenon, due to the law of gravity, or gravitation, by which all things with mass around the planet Mars are brought towards it. It is weaker than Earth's gravity due to the planet's smaller mass. The average gravitational acceleration on Mars is ms −2 (about 38% of that of Earth) and it varies laterally.


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An inversion of gravity and topography for mantle and crustal structure on Mars Download PDF EPUB FB2

We present an inversion of the long‐wavelength (harmonic degree ≤ 10) gravity and topography of Mars for lateral variations of mantle temperature and crustal thickness. Our formulation incorporates both viscous mantle flow (which most prior studies have neglected) and isostatically compensated density anomalies in the crust and by: amount of volcanic fill in this area.

The mantle thermal structure is the dominant contributor to the observed geoid in our inversion. The mantle also dominates the topography at the longest wavelengths, but shorter wavelengths (harmonic degrees >4) are dominated by the crustal Size: 1MB.

Analysis of the gravity and topography of Mars presently provides our primary quantitative constraints on the internal structure of Mars. We present an inversion of the long-wavelength (harmonic degree gravity and topography of Mars for lateral variations of mantle temperature and crustal thickness.

We present an inversion of the long-wavelength (harmonic degree less than or equal to 10) gravity and topography of Mars for lateral variations of mantle temperature and crustal thickness. Our formulation incorporates both viscous mantle flow (which most prior studies have neglected) and isostatically compensated density anomalies in the crust and lithosphere.

Our nominal model has a km-thick high-viscosity surface layer over an isoviscous mantle. We present an inversion of the long-wavelength (harmonic degree less than or equal to 10) gravity and topography of Mars for lateral variations of mantle temperature and crustal thickness.

We present an inversion of the long-wavelength (harmonic degree gravity and topography of Mars for lateral variations of mantle temperature and crustal thickness.

Our formulation incorporates both viscous mantle flow (which most prior studies have neglected) and isostatically compensated density anomalies in the crust and lithosphere. Our nominal model has a km-thick high-viscosity surface layer over an isoviscous mantle.

[87] Refined gravity and topography from the MGS mission have revealed the crustal structure of Mars to wavelengths approaching km. A terrain‐corrected gravity field reveals significant density anomalies associated with the largest volcanos and with the polar by: 1] Mars Orbiter Laser Altimeter (MOLA) topography and gravity models from 5 years of Mars Global Surveyor (MGS) spacecraft tracking provide a window into the structure of the Martian crust and.

Bruce Gordon Bills Planetary Science Section Jet Propulsion Laboratory Pasadena, CA An inversion of gravity and topography for mantle and crustal structure on Mars, J. Geophys. Res.research article Mars Orbiter Laser Altimeter (MOLA) topography and gravity models from 5 years of Mars Global Surveyor (MGS) spacecraft tracking provide a window into the structure of the Martian crust and upper mantle.

We apply a finite-amplitude terrain correction assuming uniform crustal density and additional corrections for the anomalous densities of the polar caps, the major volcanos, and the Cited by: 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. The model assumes a crustal density of 2, kg m −3, consistent with plausible crustal compositions, and an assumed mantle density of 3, kg m −3, consistent with bulk composition models The mean thickness of the crust in Fig.

2 is ∼ Cited by: [1] Mars Orbiter Laser Altimeter (MOLA) topography and gravity models from 5 years of Mars Global Surveyor (MGS) spacecraft tracking provide a window into the structure of the Martian crust and upper mantle.

We apply a finite-amplitude terrain correction assuming uniform crustal density and additional corrections for the anomalous densities ofFile Size: 1MB. Another method to probe the interior structure of the Moon is the joint analysis of gravity and topography data; the lunar gravity field is sensitive to its internal density structure (McGovern et al.,Neumann et al.,Wieczorek and Simons, ).

A common approach to this type of research is to consider that; over geological time Cited by: 6. Email your librarian or administrator to recommend adding this book to your organisation's collection. Planetary Tectonics. An inversion of gravity and topography for mantle and crustal structure on Mars.

Geophys. Res., Crustal structure of Mars from gravity and topography. Geophys. Get this from a library. An inversion of gravity and topography for mantle and crustal structure on Mars. [Walter S Kiefer; Bruce G Bills; R Steven Nerem. The Planetary and Meteorite Impact Context of Mantle Plumes.

Authors; Authors and affiliations R. () An inversion gravity and topography for mantle and crustal structure on Mars. Journal of Geophysical Research,Pirajno F. () The Planetary and Meteorite Impact Context of Mantle Plumes. In: Ore Deposits and Mantle Author: Franco Pirajno.

Topography and gravity measured by the Mars Global Surveyor have enabled determination of the global crust and upper mantle structure of Mars.

The planet displays two distinct crustal zones that do not correlate globally with the geologic dichotomy: a region of crust that thins progressively from south to north and encompasses much of the southern highlands and Tharsis Cited by: Walter S.

Kiefer, Bruce G. Bills and R. Steven Nerem, An inversion of gravity and topography for mantle and crustal structure on Mars, Journal of Geophysical Research:. The data of Bouguer gravity and topography are inverted to obtain the crust thickness of China.

In order to reduce the effect of regional non-isostasy we corrected the reference Moho depth in the inversion with regional topography relief, and performed multiple iterations to make the result more reliable.

The obtained crust thickness of China is plotted on a map in cells of 1°×1°.Author: Huang Jian-ping (黄建平), Fu Rong-shan (傅容珊), Xu Ping (许萍), Huang Jian-hua (黄建华), Zheng Yong (郑勇).

Major advances in our understanding of the interior and crustal structure of Mars have come recently in four important areas: The bulk composition of Mars is better constrained as a result of the vastly improved estimate of the moment of inertia, made possible by Pathfinder measurements.

1 Mars had a magnetic field in the past, but there is no present global field, as shown by high-amplitude.Steady-state convection in Mars’ mantle. Author links open overlay panel R.S. NeremAn inversion of gravity and topography for mantle and crustal structure on Mars.

J. Geophys. Res., (), pp. S. ZhongInternal structure and early thermal evolution of Mars from Mars global surveyor topography and gravity. Science, Cited by: planets. A number of prior studies have analyzed M,artian gravity anomalig and topography in terms of isostasy and flexure of the crust and lithosphere [e.g., 1, Other studies have emphasized the role of mantle convection in producing gravity anomalies and topography in some regions of Mars [3,