International Gravimetric Connections along the Circum-Pacific Zone (IV):-Drift Characteristics of LaCoste & Romberg Gravimeters (Model G)-

概要

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A method how to accurately determine the drift of gravimeter is one of important but difficult problems in the analysis of gravimetric data, especially for data obtained by international gravimetric connections which were carried out taking a long duration of time. The drift of LaCoste & Romberg gravimeters (model G) was thoroughly examined, using the data obtained by the international gravimetric connections which were carried out at selected cities mainly along the Circum-Pacific zone from 1979 to 1982. It was clearly recognized for some gravimeters that positive and negative drifts of the gravimeter occurred when the gravimeter was brought from cities with large and small gravity values, respectively. Generally speaking, however, cities with large gravity values are cooler, while those with small values are warmer. Such a pronounced tendency on the drift of the gravimeter may explain by an elastic property of the springs mounted inside of the gravimeter. It is difficult to conclude, at present, which affects the drift of the gravimeter more, ambient temperature or gravity value of measuring stations. Further examination of the effect of ambient temperature on the gravimeter should be made in a temperaturecontrolled environment.
日本測地学会の論文