A model for adjustment of differential gravity measurements with simultaneous gravimeter calibration |
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Authors: | F J S S Dias Í P Escobar |
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Institution: | (1) Observatório Nacional, Depto. de Geofísica, Rua Gal. José Cristino 77, Rio de Janeiro RJ 20921-400, Brazil e-mail: fernando@on.br, BR;(2) Universidade do Estado do Rio de Janeiro, Depto. de Engenharia Cartográfica, Rua S. Francisco Xavier 524, Rio de Janeiro RJ 20559-900, Brazil, e-mail: iescobar@uol.com.br, BR |
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Abstract: | A mathematical model is proposed for adjustment of differential or relative gravity measurements, involving simultaneously
instrumental readings, coefficients of the calibration function, and gravity values of selected base stations. Tests were
performed with LaCoste and Romberg model G gravimeter measurements for a set of base stations located along a north–south
line with 1750 mGal gravity range. This line was linked to nine control stations, where absolute gravity values had been determined
by the free-fall method, with an accuracy better than 10 μGal. The model shows good consistence and stability. Results show
the possibility of improving the calibration functions of gravimeters, as well as a better estimation of the gravity values,
due to the flexibility admitted to the values of the calibration coefficients.
Received: 15 November 1999 / Accepted: 31 October 2000 |
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Keywords: | : Calibration Gravimeter |
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