太原基准地震台地磁背景噪声分析

The interference factor on background noise of the geomagnetic data in Taiyuan geomagnetic observatory

太原基准地震台数字化地磁观测项目建成运行后,背景噪声水平较大,影响观测资料的使用。采取多种技术措施,认为地电阻率观测对地供电是地磁稳频干扰的主要成分,是地磁背景噪声的一项重要干扰因素。

The construction of digital Taiyuan geomagnetic observatory has been completed during the tenth five-year plan.But the observing data have a high level background noise which has impacted the data using.After carefully analysis by several technical measures,several interference factors have been discovered.The power supplied during the observation of the geoelectrical resistivity is the main reason.There are also some other factors contribute to the high level background noise.The detail analyses are presented and the methods to avoid or eliminate these interferences on the observation data also have been proposed in the paper.