Admittance estimates of mean crustal thickness and density at the Martian hemispheric dichotomy
نویسندگان
چکیده
منابع مشابه
Admittance estimates of mean crustal thickness and density at the Martian hemispheric dichotomy
[1] Admittance estimates from line-of-sight (LOS) acceleration profiles of the Mars Global Surveyor spacecraft are used to constrain the mean crustal thickness and surface density centered on the hemispheric dichotomy, from 110 E to 220 E, 40 S to 20 N. Models with uniform crustal properties predict lower than expected bulk crustal densities. Two-layer models with loading only at the surface an...
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Isosta.tica,lly compensated crusta,1 thickness variations and associated topographic contrasts a,t the surface of a planet result in lateral pressure gradients, which may cause the lower crust to flow and reduce the relief. Areas of thicker crust are genera, lly associated with more rapid relaxation of topography. On Mars, topographic features such as impa, ct basins a, nd the hemispheric dicho...
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[1] A dynamic link between the early evolution of Tharsis and the crustal dichotomy on Mars was recently proposed by Zhong (2009). We address in detail the fundamental aspects of the proposed model using 3‐D spherical shell modeling of convection. We investigate the conditions under which a spherical harmonic degree 1 flow is produced in the mantle of Mars in layered viscosity models with diffe...
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The hemispheric dichotomy on Mars is largely an expression of varying crustal thickness [1]. Although there is some disagreement as to the timing of its formation, the dichotomy is very old, forming during or before the early Noachian [2]. Several formation mechanisms, including both exogenic (giant impacts) [3] and endogenic processes including mantle convection [4], plate tectonics [5], and o...
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[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 of the polar caps, the major volcanos, and the hydrost...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Planets
سال: 2002
ISSN: 0148-0227
DOI: 10.1029/2000je001488