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泰安地磁台于1977年安装72型三分向磁变仪,并配有CHP5型核旋仪和CT6经纬仪,分别绘出垂直强度(Z)水平强度(H)及偏角(D)的基线值。长期以来,H磁变仪基线值离散度较大,其年均方误差平均为±2.5nT。在历年资料的评比会上都提出过这一问题,并怀疑是否与泰安地磁台的地质条件(地处花岗岩)有关。为此,本文从以下几个方面进行了分析讨论。
Tai’an Geomagnetic Observatory installed a type-three tangential magnetometer in 1977 equipped with a CHP5-type nuclear scanner and a CT6 theodolite to plot the baseline values of horizontal intensity (H) and declination (D) for vertical strength (Z) . For a long time, H magnetic strain gauge baseline dispersion greater, the average annual mean square error of ± 2.5nT. This issue has been raised at the review meetings of historical data and it is doubtful whether it is related to the geologic conditions (located in granite) of the Tai’an geomagnetic station. Therefore, this article analyzes and discusses from the following aspects.