关于南通台地磁近期异常的调查报告
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摘要
南通地震台核旋观测值从 2 0 0 10 8起大幅下降 ,经过与其他台站资料的比较和仪器工作情况的分析 ,认为该异常不是地磁本身的异常变化 ,也不是仪器的问题。进一步对外界环境调查和实地测试 ,证实是受台站附近基建工地的干扰影响。
Large amplitude drops of the observed values appeared in the nuclear precession magnetic observations at the Nantong Seismic Station beginning from August, 2001. On the basis of a comparison with the data from other stations and an analysis of the instrument's operation, it is believed that these anomalies did not originate from anomalous variations of the geomagnetic field itself, nor from the malfunctioning of the instrument. An investigation of the surrounding environment and an in-situ testing have proved that the anomalous variations are due to the disturbing effects of a construction site near the station.
Large amplitude drops of the observed values appeared in the nuclear precession magnetic observations at the Nantong Seismic Station beginning from August, 2001. On the basis of a comparison with the data from other stations and an analysis of the instrument's operation, it is believed that these anomalies did not originate from anomalous variations of the geomagnetic field itself, nor from the malfunctioning of the instrument. An investigation of the surrounding environment and an in-situ testing have proved that the anomalous variations are due to the disturbing effects of a construction site near the station.
引文
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