【摘要】 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.更多还原

【Abstract】 According to the result of geomagnetic data,great abnormal magnetic phenomenon occurring repeatedly before some significant earthquakes were found.This kind of phenomenon occurs about from over forty to a hundred days before.This preseismic geomagnetic anomaly lasts long as the magnitude increases.The nature of geomagnetic data before earthquakes has something to do with earthquake prediction and may be applied to precaution against earthquake disasters.更多还原