Have graben wall scarps accumulated sand and dust on Mars?

Details Have graben wall scarps accumulated sand and dust on Mars? Have graben wall scarps accumulated sand and dust on Mars?

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sdum.nasa...20g&link_type=abstract

In NASA. Ames Research Center, Sand and Dust on Mars p 20 (SEE N91-27057 18-91)

Mathematics

Logic

Dust, Geological Faults, Mars Surface, Sands, Slopes, Topography, Deposition, Escarpments, Mars (Planet), Planetary Mapping, Relief Maps, Troughs

Scientific paper

Grabens are linear fault bounded troughs that are extremely abundant on Mars (about 7000 cover the Western Hemisphere). Analysis of lunar and Martian grabens as well as analogous structures on Earth indicates that grabens form under extension when the crust is pulled apart. On Mars, topographic maps are not of sufficient resolution to measure graben wall slopes. Seismic shaking on Mars might be capable of reducing 60 deg fault scarps to an angle of repose. Some other process must be responsible for further reducing graben wall slopes. If the deposition of sand and dust along graben walls is responsible for their extremely low slopes, then a variety of implications are possible. Sand and/or dust movement and deposition is ubiquitous in grabens over most of Mars, as similar looking grabens are found over the entire Western Hemisphere and this requires a plentiful supply of sand or dust. If the material that accumulates is of low density and cohesion, attempts to traverse graben walls might be difficult. Rimless shallow depressions could be more effective sinks for sand and dust on Mars than has been realized.

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