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

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DOIResolve DOI: http://doi.org/10.1007/s00190-011-0539-y
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TypeArticle
Journal titleJournal of Geodesy
ISSN0949-7714
1432-1394
Volume86
Issue8
Pages591596
Subjectabsolute gravimetry; gravimeter; GRAV-D; comparison; offset
AbstractThe 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 date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
Identifier539
NPARC number21268274
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Record identifierb24411db-100e-4991-9764-063f4d3c9fe5
Record created2013-06-13
Record modified2016-05-09
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