华北地区强震前地磁短期异常特征研究  

Research on short-term abnormal characteristics of geomagnetism before the strong earthquakes in North China region

作　　者：田山[1] 吴国有[1] 关华平[2] 刘允秀[1] 

机构地区：[1]天津市地震局,天津300201 [2]中国地震局分析预报中心,北京100036

出　　处：《地震》2004年第2期97-102,共6页Earthquake

基　　金：国家科技攻关计划项目(2001BA601B01015 03)

摘　　要：从地震前兆信息"场"的概念出发,利用空间线性度方法对华北地区强震前多台地磁Z值观测资料进行组合计算,得到描述孕震过程中前兆场的特征量空间线性度α。该文分别组合计算了华北地区发生的7次5级以上强震前的地磁Z值观测资料。结果表明,强震前半年内震源区附近地磁Z值的空间线性度α有明显的下降异常变化。Based on the concept of information field of earthquake precursors, using the method of the spatial linearity to calculate the geomagnetism data of Z direction we can find the precursory characteristic value-spatial linearity short-term abnormal characteristic value (α), which describes the earthquake source region in the process of earthquake preparation. By analyzing the geomagnetism data of Z direction before seven strong earthquakes with M>5 previously happened in North China, we can conclude that the spatial linearity (α) of geomagnetism data of Z direction will decline obviously nearby the earthquake source region before half a year of the strong earthquake.

关 键 词：地磁变化 地震前兆 短期异常 空间线性度 

分 类 号：P315.721[天文地球—地震学]