Mathematics – Logic
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999lpico.988...37s&link_type=abstract
Space Resources Utilization Roundtable, p. 37
Mathematics
Logic
Planetary Surfaces, Surface Properties, Space Exploration, Roving Vehicles, Rover Project, Viking Lander Spacecraft, Aerospace Environments, Space Manufacturing, Structural Design, Construction, Seismic Waves, S Waves, Rayleigh Waves, Surface Waves
Scientific paper
To develop useful products in space environment, engineering evaluations of relevant geologic materials will have to be conducted early in the exploration phase. These evaluations will be required in the planning and design of constructed facilities and resource recovery operations. One emerging technology for such studies is based on the measurement and analysis of seismic surface waves of the Rayleigh (R) type. All measurements are performed in situ, are nondestructive, and require only instrumentation placed on the planetary surface being investigated. The product of each set of measurements is a profile of shear wave velocity versus depth at the test location. The profile can range from a one-dimensional to a three-dimensional image, depending upon the number and configuration of the measurements. The depth of the profile is proportional to the length of the instrumentation array, with exploration depths of 5 cm to 15 m targeted in this work. The resulting profiles can be used to evaluate or estimate the characteristics of the geologic materials in terms of: 1. layering and lateral continuity in the subsurface, 2. in situ densities and their spatial variations, 3. in situ strengths, 4. weathering processes (especially relative to exterior surfaces of rocks and boulders), 5. crater mechanics, 6. changes in the geologic materials with thermal changes, and 7. identifying ice and characterizing its lateral extent, depth and general composition (massive versus nodules).
Carrier David III W.
Stokoe Kenneth H. II
Wright Stephen G.
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