黄海地震前后的地磁日变化

本文采用多道滤波的方法,对江苏省内地磁台网记录到的地磁垂直分量日变化进行分析,结果表明,黄海地震发生前,特别是地震前三天,距震中最近的海安台原始数据和滤波器实际输出之间的日标准偏差,明显高于平常水平,发震后又恢复到正常水平.

GEOMAGNETIC DAILY VARIATIONS AROUND THE HUANGHAI EARTHQUAKE

The geomagnetic daily variations of the vertical component, which were recorded by a geomagnetic network in Jiangsu province, are investigated with the method of Multitchannel Wiener Filtering. The results show that the daily standard errors between raw data and the actual output of the filter for the nearest station from the epicenter are distinctly higher than the ordinary level before (especially three days before) the Huanghai earthquake, then return to normal level after the earthquake.