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通过分析6个强震震中附近地磁Z分量秒数据的处理结果显示:一些强震在震前反复出现较强的地磁异常现象.此现象在震前百余天至四十余天和临震前出现;地磁场的特大异常持续天数随震级的增大而增大,其异常天数与总体天数的比值随着震级的增大而增大.该特性对于短临地震预报预警及防震减灾具有一定意义.
The results of processing the second-order data of the geomagnetic Z component near the epicenter of the 6 strong earthquakes show that some strong earthquakes repeatedly show strong geomagnetic anomalies before the earthquake, ranging from more than 100 days to more than 40 days before the earthquake and And the ratio of days of anomaly to total days increased with the increase of magnitude.These characteristics have some significance for short-term and short-term earthquake prediction and warning and earthquake disaster prevention and reduction .