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地震

地震 ›› 2004, Vol. 24 ›› Issue (2): 97-102.

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华北地区强震前地磁短期异常特征研究

田山1, 吴国有1, 关华平2, 刘允秀1   

  1. 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
  • 出版日期:2004-04-30 发布日期:2021-11-29
  • 作者简介:田山(1952-), 男, 天津市人, 高级工程师, 主要从事地震分析预报及电磁学预报方法研究。
  • 基金资助:
    国家科技攻关计划项目(2001BA601B01015-03)

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

TIAN Shan1, WU Guo-you1, GUAN Hua-ping2, LIU Yun-xiu1   

  1. 1. Seismological Bureau of Tianjin Municipality, Tianjin 300201;
    2. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Online:2004-04-30 Published:2021-11-29

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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。

关键词: 强震短期异常, 地磁垂直分量, 空间线性度

Abstract: 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.

Key words: Short-term anomaly of strong earthquake, Vertical component of geomagnetism, Spatial linearity

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