Open AccessReference gravity stations. on the IGSN71 standard in Britain and Greece
Author(s) -
Hipkin R. G.,
Lagios E.,
Lyness D.,
Jones P.
Publication year - 1988
Publication title -
geophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0952-4592
DOI - 10.1111/j.1365-246x.1988.tb01128.x
Subject(s) - scale (ratio) , geodesy , calibration , metre , geology , specific gravity , gravimeter , national standard , mathematics , geography , statistics , mineralogy , cartography , geophysics , engineering , physics , casing , pulp and paper industry , astronomy
SUMMARY The International Gravity Standardisation Net 1971 (Morelli et al. 1974) includes no reference sites in Greece. We describe composite observations with LaCoste and Romberg (LCR) gravity meters which tie a newly established site at Athens Airport to IGSN71 sites in Rome and Edinburgh, as well as determining the absolute scale of the Greek National Calibration Line on Mount Parnis. As a by‐product, the manufacturers’ scale of the LCR meter G‐275 is found to require correction by the factor 1.000 622 ± 0.000 027 against IGSN71. Using this factor, we confirm the IGSN71 scale in Britain by deducing a gravity difference of 387.185 ± 0.018 mGal between Edinburgh A and Teddington A, compared with the IGSN71 value of 387.19 ± 0.030 mGal. The same interval for the National Gravity Reference Net 1973 (Masson Smith et al. 1974) is 397.128 ± 0.023 mGal, so that our observations confirm Turnbull's (1986) conclusion that the NGRN73 connection to Edinburgh Turnhouse Airport was faulty. There are now no significant differences in either overall scale or individual station values between our observations on a selection of NGRN73 sites and those obtained under a program of re‐observation by the British Geological Survey. However, we found an error exceeding 0.2 mGal in one of the original NGRN73 values.