利用地磁日变低点位移确立地震短临预报指标的方法

利用华北地区近２０ａ来的资料，对地磁日变低点位移与地震的关系进行了统计研究，并在此基础上建立了地震的短临预报指标。统计结果表明，低点位移分界线的分布与震中的分布有较好的一致性，两者均为网络状分布。还获得了一些可以区分震中区异常和非震中区异常的信息，并且初步确定了提取这个信息量的方法。这对于进一步缩小预报地区的范围有其实用意义。

THE METHOD OF DETERMINING THE INDEX OF THE SHORT-TERM AND IMMINENT EARTHQUAKE PREDICTION BY USING THE LOW-POINT DISPLACEMENT OF THE DAILY GEOMAGNETIC VARIATION

This paper statistically studied the relationship between seismicity and thelow-point displacement of the daily geomagnetic variation by using the data of the lasttwo decades in North China, based on which the index of the short- term and imminentearthquake prediction was established. The statistical result shows that the distributionof the low-point disp1acement boundary is quite coincident with the epicenter distribu-tion, both distributed in netted pattern. The further research on the feature of theIow-point displacement also obtained some information, which can discriminate theanomaly of the epicentral region from that of the non-epicentral regions. The tech-niques for extracting this information were preliminarily determined. It is practically sig-nificant to diminish the range of the prediction region.