大同—阳高地震和电磁脉冲记录仪使用的回顾

Review of the Datong Yanggao Earthquake and Research of Electromagnetic Pulse

分析了山西省地震局研制的ＤＭＪ—８５Ａ电磁脉冲记录仪记录的实例。表明，电磁脉冲记录在震前有数值大（超过干扰数倍、数１０倍），大数群发、间断出现，随机突变等特征。给出了根据异常的数值、延续时间、异常方向等判断震级、震中距、发震时间的震例。

Examples recorded by electromagnetic pulse instrument (DMJ 85A) developed by Seismological Bureau of Shanxi Province are analyzed. Result indicates that records of electromagnetic pulse have characters of bigger values(a few times even decade times as large as inference), bigger values appearing simultaneously, discontinuity and random saltation etc. Using the va lue of anomaly, duration, and abnormal direction etc, the magnitude, epicenter distance, origin time of earthquakes may be determined.