Large slopes in Venusian layered basalt - Too stable for failure?

Details Large slopes in Venusian layered basalt - Too stable for failure? Large slopes in Venusian layered basalt - Too stable for failure?

Publishing date

Mar 1997

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1185r&link_type=abstract

Journals

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 185.

Science

Computer Science

Additional info 3

Venus Surface, Basalt, Magellan Spacecraft (Nasa), Radar Imagery, Topography, Venus Atmosphere, Rocks

Type

Scientific paper

Abstract

Magellan radar images reveal numerous slope failures on the Venusian surface. The nature of these failures can be surmised from the visible morphology and detailed topography of the slopes on which they reside. These failures can provide illumination of the rock mass strength characteristics of the layered basalt of which these failed escarpments, and indeed most of the Venusian surface, are composed. To address this problem, slope stability analyses have been performed using slope models with dimensions known to exist on the Venus surface, and possible atmospheric influences were considered and factored into the evaluation. Instantaneous values of cohesion and internal friction for the rock mass were derived from Rock Mass Rating values for the Venusian surface of between 25 and 75, and used in the analysis. Results indicate stability under these conditions supporting the conclusion that, for the scarp geometries seen on Venus, slope failures within layered basalt result from a modification of the driving or resisting forces on potential failure surfaces and not an insufficient rock mass strength.

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