上海深井地震综合观测地磁资料分析

Analysis of multi-component geomagnetic data observed in deep borehole in Shanghai

运用崇明长江农场台和浦东张江台新建地震综合深井地磁三分量资料,宋用小波变化方法,研究地磁场井下观测方式、数据质量和噪声特性。结果表明:①深井地磁观测资料日变形态明显,与地面观测资料一致性较好;②深井地磁观测能滤除大部分空间变化磁场产生的扰动;③深井观测的背景噪声幅度小,扰动频段集中。

In this paper, the observation data that the 3-component geomagnetic field recorded in deep borehole in Changjiang Nongchang Station, Chongming and Zhangjiang Seisnoc Sta- tion, Pudong were analyzed by the method of wavelet transform . We discussed the observa- tion way of geomagnetic field in deep borehole, data quality and noise characteristics. The result shows. ①there is obvious daily variation form and consistency for the data observed in deep borehole; ②the deep borehole observation can filter more magnetic interference that comes from space;③the amplitude of noise that recorded by deep borehole observation is smaller than that of the ground-based observation, and the interference frequency range is more concentrated.