Computer Science – Sound
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p51a..04w&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P51A-04
Computer Science
Sound
1823 Frozen Ground, 5462 Polar Regions, 5464 Remote Sensing, 5494 Instruments And Techniques, 6225 Mars
Scientific paper
Ground Penetrating Radar (GPR) is an efficient, non-invasive tool for subsurface investigations. Whereas low frequency orbital and airborne radar sounders can penetrate hundreds of meters or even a few kilometers, ground-coupled GPR operating between 100 and 1000 MHz can penetrate 10 to 20 m below the surface. GPR data from the top 10s of meters provide high-resolution information about the electrical properties and geologic structure of the shallow subsurface. On Earth, geologic GPR surveys have been used to study the third dimension (depth) of geologic relationships observed at the surface. Depth information is a significant addition to understanding the geologic setting and history of a field site. In recognition of the potential for a rover-deployed Mars GPR to help characterize future landing sites, fieldwork is being conducted at martian analog sites to demonstrate and assess the capabilities of GPR in those environments. Data are collected using commercial antennas at several frequencies as well as a prototype Mars GPR antenna currently under development. To complement past GPR measurements from arid environments in Arizona, California, and Egypt, fieldwork is planned to collect data in areas with ground ice and frozen ground. Data collection is planned in the Mackenzie Delta region of Northwest Territories, Canada, for late March when the average air temperature is -14\deg C and the ground has been constantly frozen for more than five months. The Mackenzie Delta offers analogs for various terrains and features that may exist at mid- to high-latitudes on Mars. This area has been the focus of previous studies of ground ice, and the GPR measurements will be coordinated with a study using resistivity measurements to map ice. In addition, shallow seismic data will be collected, and existing bore hole data will be used to tie geophysical measurements to the local geology. Data will be collected over ice wedges, a pingo, snow-covered gullies, the transition from ice-poor to ice-rich ground, and over ground ice overlain by sand and by gravel. If weather conditions permit, data will also be collected on frozen lake and sea ice.
Grant Alex J.
Schutz Alan E.
Williams Karina
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