Abstract
The National Geodetic Survey (NGS) and the Defense Mapping Agency, Hydrographic and Topographic Center (DMA/HTC) began joint absolute gravity measurements in the spring of 1987. The program’s two major objectives were to establish a more precise national gravity reference network and to monitor/study temporal gravity variations, particularly those related to vertical crustal motion. The NGS absolute gravity instrument, Jilag No. 4, used for this program was one of six such devices developed and built by the Joint Institute for Laboratory Astrophysics (Jila), established by the University of Colorado and the National Institute of Standards and Technology (Figure 1). DMA/HTC obtained one of the other gravity instruments; the remaining four were purchased by scientific institutions in Canada, Germany, Finland, and Austria.
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