Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33b1444b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P33B-1444
Physics
0708 Thermokarst, 5415 Erosion And Weathering, 5464 Remote Sensing
Scientific paper
Utilizing Martian satellite images from MRO HiRISE, CTX, THEMIS VIS, and MGS MOC we have identified a meso-scale, latitude-dependent type of depression which we are calling Elevated Flat Floor Depressions (EFFDs). A detailed survey of these features was conducted across the Southern Highlands. This survey indicates that EFFDs are characterized by: 1) A restricted in geomorphic region. EFFDs are located in a latitude band of between 40° and 60° and are more prevalent in the southern hemisphere. The depressions also are situated on or near the apex of medium (30km) size crater rims. 2) A distinctive morphology. EFFDs are typically around 1000m in diameter, orientated parallel to the crater rim, have steep, well defined scarps, and are completely enclosed. 3) Appears to be a recent formation. EFFDs have a "fresh" appearance with distinctively sharp scarps even in mantled terrains and contain no superimposed features. In addition to a general survey, stereopairs of HiRISE and CTX images were used to create high resolution DEMs of the depressions to study topography and gradients produced by these depressions. We conclude that due to the latitude dependence, morphology and unaccounted volume loss that these features are periglacial in origin similar thermokarst depressions.
Benthem A.
Howard Andrew
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