Physics – Space Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21..537w&link_type=abstract
Reviews of Geophysics and Space Physics (ISSN 0034-6853), vol. 21, April 1983, p. 537-543.
Physics
Space Physics
1
Gravimetry, Measuring Instruments, Technology Assessment, Airborne Equipment, Gravity Anomalies, Portable Equipment, Standards
Scientific paper
Progress in U.S. gravimetry in the years 1979-1982 is reviewed. Advances in techniques and data have been through use of a portable absolute gravity apparatus, airborne gravimetry using a helicopter measuring system, the establishment of a new long-range calibration line, and plans for a superconducting gravimeter. Studies have defined the 1 x 1 deg free-air gravity field for 65 pct of the globe using satellite altimetry and surface data. Standards have been adopted for site selection criteria. Absolute gravity measurements with free-fall devices have been performed at 13 sites in the U.S., although further measurements at some sites have shown poor reproducibility. A check of the accuracy of the portable device has indicated an accuracy of 6 parts per billion. About 232,000 new gravity stations have been established on the continent and in nearshore waters. Airborne surveys have covered 100,000 miles, with the flights in a helicopter at 2000 ft altitude. Finally, automated files have been established covering millions of gravity measurements performed by the military and other governmental departments.
Scheibe D. M.
Wilcox L. E.
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