Computer Science – Sound
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p41a1346b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P41A-1346
Computer Science
Sound
5144 Wave Attenuation, 5419 Hydrology And Fluvial Processes, 5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
High Resolution Stereo Camera (HRSC) images of the vicinity of Athabasca Valles area (5°N, 150°E) reveal a surface with a broken, rafted-plate morphology. Two formation hypotheses (volcanic or fluvial) have been proposed to explain this appearance. In order to test these volcanic and fluvial hypotheses for the origin of the rafted-plate terrain, we investigated the subsurface radar echo from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) 5 MHz-band data over this area. The backscattered signal losses were compared to Finite Difference Time Domain (FDTD) simulations of those arising from two hypothetical geoelectrical subsurface models, which differed in their assumed ice content. Within this region, MARSIS experienced loss rate of 0.09dB/m in the first 160 m beneath the surface. FDTD simulations show that, if the near-surface environment (up to 45 m depth) is ice-rich (80% by volume), it will result in a loss rate of 0.048dB/m, whereas the losses associated with an ice-poor model (20% of ice by volume) increase to 0.10dB/m. Comparing the observed MARSIS losses with the simulated ones suggests that propagation characteristics of Athabasca's subsurface seems most consistent with a volcanic rather than a fluvial origin for the broken, rafted-plate terrain in the vicinity of Athabasca.
Boisson Joséphine
Clifford Stephen M.
Farrell William M.
Frigeri Achille
Gurnett Donald A.
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