华北地区强震前电磁短期异常特征研究  

Research on Short-Term Abnormal Characteristics of Strong Earthquakes in North China

作　　者：田山[1] 关华平[2] 吴国有[1] 刘允秀[1] 

机构地区：[1]天津市地震局,天津市河西区友谊路19号300201 [2]中国地震局分析预报中心,北京市复兴路63号100036

出　　处：《中国地震》2004年第1期80-88,共9页Earthquake Research in China

基　　金：国家科技攻关计划项目<强地震短期预测技术研究>子专题"强震前电磁短期阶段异常演化特征与识别标志"(2 0 0 1BA6 0 1B0 1 0 5 0 3)

摘　　要：利用空间线性度方法对强震近震中区的多台地电阻率、地磁Z等观测资料进行组合计算 ,得到描述强震前近震中区前兆场的新特征量———空间线性度α。分析计算了华北地区发生的 8次 5 5级以上强震前的地电、地磁观测资料 ,结果表明 ,强震前半年内震源区附近的α有明显的下降异常变化。Using the measurement of the spatial linearity to calculate the geoelectrical resistivity and the geomagnetism datum of Z direction of some stations near epicenter of strong earthquake,we can find the new premonitory characteristic value——spatial linearity short-term abnormal characteristic value(α) which describes premonitory field in the epicenter district before strong earthquake. By analyzing the datum of geoelectrical resistivity and the geomagnetism datum of Z direction in 8 strong earthquakes with M≥5.5 previously occurred in north China, we can conclude that the spatial linearity(α) will decline obviously in the earthquae cource district before half an year of the strong earthquake.

关 键 词：强震 地电阻率 地磁场垂直分量 空间线性度 地震短期异常 

分 类 号：P315[天文地球—地震学]