Results of the first North American comparison of absolute gravimeters, NACAG-2010
Journal of Geodesy
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Abstract
The first North American Comparison of absolute gravimeters (NACAG-2010) was hosted by the National Oceanic and Atmospheric Administration at its newly renovated Table Mountain Geophysical Observatory (TMGO) north of Boulder, Colorado, in October 2010. NACAG-2010 and the renovation of TMGO are part of NGS’s GRAV-D project (Gravity for the Redefinition of the American Vertical Datum). Nine absolute gravimeters from three countries participated in the comparison. Before the comparison, the gravimeter operators agreed to a protocol describing the strategy to measure, calculate, and present the results. Nine sites were used to measure the free-fall acceleration of g. Each gravimeter measured the value of g at a subset of three of the sites, for a total set of 27 g-values for the comparison. The absolute gravimeters agree with one another with a standard deviation of 1.6 µGal (1 Gal = 1 cm s-2). The minimum and maximum offsets are -2.8 and 2.7 µGal. This is an excellent agreement and can be attributed to multiple factors, including gravimeters that were in good working order, good operators, a quiet observatory, and a short duration time for the experiment. These results can be used to standardize gravity surveys internationally.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Results of the first North American comparison of absolute gravimeters, NACAG-2010 |
| Series title | Journal of Geodesy |
| DOI | 10.1007/s00190-011-0539-y |
| Volume | 86 |
| Issue | 8 |
| Year Published | 2012 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Arizona Water Science Center |
| Description | 6 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geodesy |
| First page | 591 |
| Last page | 596 |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |