An alternative explanation for the ``Buried Channels'' on Mars: The gravity signal from a sharp boundary on partially compensated, long-wavelength topography

Details An alternative explanation for the ``Buried Channels'' on Mars: The gravity signal from a sharp boundary on partially compensated, long-wavelength topography An alternative explanation for the ``Buried Channels'' on Mars: The gravity signal from a sharp boundary on partially compensated, long-wavelength topography

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3105701d&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 5, CiteID L05701

Physics

2

Planetology: Solid Surface Planets: Gravitational Fields (1227), Planetology: Solid Surface Planets: Tectonics (8149), Planetology: Solar System Objects: Mars

Scientific paper

A trough observed in the free-air gravity of Mars along the edge of Tempe Terra has been interpreted as a large channel that has been completely buried by sediments. Here, we show that this trough is likely real and not a product of ringing in a truncated harmonic expansion, but that it is poorly resolved. A detailed examination of the high-resolution topographic data displays no evidence for a buried channel, instead showing that the trough straddles the highlands-lowlands boundary. As an alternative, we propose this gravity trough in a large way arises from the surface topography, due to an effect that occurs when there exists a relatively sharp boundary on a long-wavelength, partially compensated feature.

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