Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content

Details Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...45..320w&link_type=abstract

Icarus, vol. 45, Feb. 1981, p. 320-330.

Physics

11

Ejecta, Finite Element Method, Mars Craters, Mars Surface, Moisture Content, Plastic Deformation, Shear Stress, Stress Distribution, Stress Propagation, Viscous Flow, Mars, Flow, Stress, Ejecta Blankets, Rampart Craters, Water, Shear, Deposits, Size, Models, Diameter, Thickness, Volatile Elements, Physical Properties, Magnitude, Distribution, Analysis, Friction, Viscosity, Deformation, Data, Photographs, Clays, Composition

Scientific paper

Measurements of extents of rampart ejecta deposits as a function of the size of the parent craters support models which, for craters larger than about 6 km diameter, constrain ejecta blankets to all have a similar maximum thickness regardless of the crater size. These volatile-rich ejecta blankets may have failed under their own weights, then flowed radially outward. Assuming this to be so, some of the physicomechanical properties of the ejecta deposits at the time of their emplacement can then be determined. Finite-element studies of the stress magnitudes, distributions, and directions in hypothetical Martian rampart ejecta blankets reveal that the material most likely failed when the shear stresses were less than 500 kPa and the angle of internal friction was between 26 and 36 deg. These figures imply that the ejecta has a water content between 16 and 72%. Whether the upper limit or the lower limit is more appropriate depends on the mode of failure which one presumes: namely, viscous flow of plastic deformation.

Affiliated with

Also associated with

No associations

Rating

Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preflow stresses in Martian rampart ejecta blankets - A means of estimating the water content will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1407972