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| 华北地区强震前地磁短期异常特征研究 | |
| 引用本文： | 田山,吴国有,关华平,刘允秀.华北地区强震前地磁短期异常特征研究[J].地震,2004,24(2):97-102. |
| 作者姓名： | 田山 吴国有 关华平 刘允秀 |
| 作者单位： | 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 |
| 基金项目： | 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。 |
| 关 键 词： | 强震短期异常 地磁垂直分量 空间线性度 |
| 文章编号： | 1000-3274(2004)02-0097-06 |
Research on short-term abnormal characteristics of geomagnetism before the strong earthquakes in North China region |
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| TIAN Shan,WU Guo-you,GUAN Hua-ping,LIU Yun-xiu.Research on short-term abnormal characteristics of geomagnetism before the strong earthquakes in North China region[J].Earthquake,2004,24(2):97-102. | |
| Authors: | TIAN Shan WU Guo-you GUAN Hua-ping LIU Yun-xiu |
| Institution: | 1. Seismological Bureau of Tianjin Municipality, Tianjin 300201; 2. Center for Analysis and Prediction, CSB, Beijing 100036, China |
| 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. |
| Keywords: | Short-term anomaly of strong earthquake Vertical component of geomagnetism Spatial linearity |
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