Mathematics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf..186y&link_type=abstract
International Conference on Mars Polar Science and Exploration, p. 186
Mathematics
Mars Surface, Mars (Planet), Polygons, Cracks, Ice, Contraction, Planetary Geology, Mars Global Surveyor, Frost, Morphology, Underground Structures
Scientific paper
The Viking images reported gigantic polygonal patterns on the surface of Mars and since then, the origin of these polygons has been the subject of much discussion. The shape of these polygons are not only similar to terrestrial frost contraction crack polygons such as ice wedge polygons or soil wedge polygons, but the conditions under which these polygons develop also appears to be similar to those in permafrost regions of Earth. However, compared with terrestrial polygons, some of the Martian polygons are simply too big. In this paper we address the question, 'How many of the Martian polygons developed by contraction cracking?' Image analysis of the recent high resolution images from the Mars Orbiter Camera (MOC) by the Mars Global Surveyor enables classification of the types of cracking in the polygonal pattern. Polygons are characterized by shape (form factor), size (equivalent to diameter), type of boundary (trough and/or ridge), and pattern of intersections (orthogonal or non-orthogonal systems). These polygonal characteristics respond to properties of the ground material, the temperature gradient, and the ice (water) content. It is possible to estimate the subsurface composition (soil properties) using thermal crack models. Lachenbruch used mechanics to develop detailed mathematical models that support the theory and provide a quantitative basis for amount of thermal tension, depth and rate of cracking, crack spacing, and origin of the polygonal network. He distinguished two polygonal systems: (1) orthogonal and (2) nonorthogonal. The ground material and thermal regime of polygons sites can be estimated by the space of the cracking and the pattern of the intersections of polygons and surface morphology. The goal of this study is to reveal the underground structure and the depth of the ice rich permafrost under the Martian polygons. Additional information is contained in the original extended abstract.
No associations
LandOfFree
Contraction Cracking and Ice Wedge Polygons in Mars 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 Contraction Cracking and Ice Wedge Polygons in Mars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contraction Cracking and Ice Wedge Polygons in Mars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-891406