Progress in the Global Standardization of Gravity: An Analysis of the Woollard and Rose International Gravity Values,
HAWAII INST OF GEOPHYSICS HONOLULU
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The history of improvements in the global standardization of gravity values since the advent of high range gravimeters in 1948 is reviewed. In particular the gravity base values given in SEG special publication International Gravity Measurements Woollard and Rose, 1963 are evaluated against the most recent set of standardized gravity base values, The International Gravity Standardization Net, 1971 Morelli et al, 1974. Adjunct IGSN 71 values prepared by the U.S. Defense Mapping Agency Aerospace Center unpublished are also used to give a more comprehensive worldwide comparison of values. The results for 787 comparisons of Woollard and Rose 1963 values and IGSN 71 values for the same sites indicate that, in general, there is no difference in gravity standard represented. However, there is a mean absolute datum difference of 14.7 mgal standard deviation 0.25 mgal. As this value is the same as the difference in the IGSN 71 value for the Woollard and Rose primary base value at Madison, Wisconsin, it corroborates the independent assessment that there is, in general, no difference in gravity standard.