The F, H and Z component of geomagnetic data observed by some seismostations in recent 30 years, such as Hongshan, Houtuqiao, are analyzed, and the annual rate of Z component is also studied.
利用红山、后土桥等台近30年的的地磁绝对观测资料，对F、H、Z各分量进行了分析，对Z分量的年速率进行了研究。
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