Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p32b..04f&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P32B-04
Mathematics
Logic
5415 Erosion And Weathering, 5464 Remote Sensing, 5470 Surface Materials And Properties, 6207 Comparative Planetology, 1824 Geomorphology (1625)
Scientific paper
Rock-avalanche deposits on Mars have generated hypotheses about the tectonics and surface conditions of that planet. These are predicated in part on the occurrence of similar deposits on earth. Rock avalanches present a first-order mechanical conundrum due to their extraordinarily long run-out. This has prompted many hypotheses for their occurrence, including aeroplaning, granular dispersion, frictional melting, and acoustic fluidization. These hypotheses are based on observation of geological fabrics, eye-witness accounts, and flow morphology, leading to characterizations which are local consistent but difficult to apply across the range of conditions on earth, the moon, and Mars where these events occur. New experimental results from the Granular Physics Lab at Univ. Maryland provide insight into granular flow phenomema. These include the observation of memory effects during initiation of shear bands, the sorting of polydisperse grains, and the effects of flow volume and substrate friction on flow velocity profiles. The experimental results on granular memory effects and avalanche triggering should provide new insights into the boundary conditions needed to produce long run-out. We critically compare the experimental results with new field observations for the Blackhawk landslide in California and landslides in Ganges Chasma, Mars concerning the overall morphology, substrate, and phenomenology of those rock-avalanche deposits. As such, the experimental data may provide firmer constraints on the interpretation of rock-avalanche features whether terrestrial, marine, or extraplanetary
Friedmann J.
Harp J.
Kwon Gyuhyun
Losert Wolfgang
Rastogi Parul
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