Gravitational spreading of Danu, Freyja and Maxwell Montes, Venus

Details Gravitational spreading of Danu, Freyja and Maxwell Montes, Venus Gravitational spreading of Danu, Freyja and Maxwell Montes, Venus

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...41s&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 41-43 (SEE N92-10728 01-91)

Physics

Geophysics

Gravitational Effects, Radar Imagery, Spreading, Surface Temperature, Terrain, Venus Surface, Crusts, Elevation, Plains, Plateaus, Potential Energy, Topography, Venus (Planet)

Scientific paper

The potential energy of elevated terrain tends to drive the collapse of the topography. This process of gravitational spreading is likely to be more important on Venus than on Earth because the higher surface temperature weakens the crust. The highest topography on Venus is Ishtar Terra. The high plateau of Lakshmi Planum has an average elevation of 3 km above mean planetary radius, and is surrounded by mountain belts. Freyja, Danu, and Maxwell Montes rise, on average, an additional 3, 0.5, and 5 km above the plateau, respectively. Recent high resolution Magellan radar images of this area, east of approx. 330 deg E, reveal widespread evidence for gravity spreading. Some observational evidence is described for gravity spreading and the implications are discussed in terms of simple mechanical models. Several simple models predict that gravity spreading should be an important process on Venus. One difficulty in using remote observations to infer interior properties is that the observed features may not have formed in response to stresses which are still active. Several causes of surface topography are briefly examined.

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