Summary
In 1976 and 1977, 25 absolute-gravity measurements were carried out in 17 stations in Europe with the new transportable apparatus of the Istituto di Metrologia «G. Colonnetti», in order to improve the world gravity standard, to begin the study of the scale linearity along the line Hammerfest-Nairobi in IGSN 71 and to establish new absolute references. The uncertainty of the measurements is of the order of 10 μGal, about 20 times better than the accuracy of IGSN 71.
Riassunto
Nel 1976 e 1977, usando il nuovo gravimetro assoluto trasportabile messo a punto dall’Istituto di Metrologia «G. Colonnetti» di Torino sono state eseguite 25 determinazioni del valore assoluto dell’accelerazione di gravità in 17 località europee, allo scopo di aumentare la precisione della rete gravimetrica internazionale, di iniziare lo studio relativo alla linearità della scala della linea IGSN 71 Hammerfest-Nairobi e di istituire nuovi riferimenti assoluti. La precisione delle misure è risultata dell’ordine di 10 μGal, circa 20 volte migliore di quella dell’IGSN 71.
Резюме
В 1976 и 1977 годах в Европе были проведены абсолютные гравитационные измерения с помощью новой переносной аппаратуры института метрологии «Дж. Колоннетти», чтобы начать исследование линейности масштаба вдоль линии Хаммерфест-Найроби в IGSN 71 и установить новые абсолютные эталоны. Неопределенность измерений составляет порядка 10 μGal, что в 20 раз лучше, чем точность IGSN 71.
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Abbreviations
- g :
-
mean value of gravity acceleration, including correction for electronic delay (−40 μGal)
- g r :
-
g value reduced at the reference level
- ϖg/ϖh :
-
vertical gradient
- h :
-
height from ground or from pillar surface of the point where theg value was determined (in mm)
- H :
-
height from sea level (in m)
- Honk:
-
Honkasalo’s corrective term
- m :
-
standard deviation (in μGal)
- M :
-
standard error (in μGal)
- N :
-
total number of measurements for each station
- LRD, LRG:
-
La Coste and Romberg model D, model G meters
- SVL:
-
secular variation line
- φ, λ:
-
geographical co-ordinates
- very low :
-
amplitude <0.1 μm without impulsive change in frequency
- low :
-
amplitude <1 μm regular variations in frequency
- high :
-
amplitude >1 μm regular variations in frequency
- very high :
-
amplitude >1 μm and frequent changes in frequency
References
C. Morelli, C. Gantar, T. Honkasalo, R. K. McConnell, I. G. Tanner, B. Szabo, U. Uotila andC. T. Whalen:The International Gravity Standardisation Net 1971 (IGSN 71), Publ. Spec. No. 4, Int. Ass. of Geodesy, Paris (1974).
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A. H. Cook:Bull. Geod., No. 44 34 (1957).
A. Kiviniemi:The first-order gravity net of Finland, Veröff. Finn. Geod. Inst., No. 59, Helsinki (1964).
A. Kiviniemi:High-precision measurements for study the secular variation in gravity in Finland, Veröff. Finn. Geod. Inst., No. 59, Helsinki (1964).
L. Petterson:Studium av sekular endring i tym tymgkraften utefter latitud 63° mellan atlanten och Bottenhavet, presented at theMeeting of the Nordic Geodetic Commission, Copenhagen, May 6–10, 1974.
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Cannizzo, L., Cerutti, G. & Marson, I. Absolute-gravity measurements in Europe. Il Nuovo Cimento C 1, 39–85 (1978). https://doi.org/10.1007/BF02508046
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DOI: https://doi.org/10.1007/BF02508046