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Results of the first North American comparison of absolute gravimeters, NACAG-2010

Journal of Geodesy

By:
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DOI: 10.1007/s00190-011-0539-y

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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.

Additional Publication Details

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
Number of Pages:
6
Additional Online Files(Y/N):
N