ZHANG Ling,
DU Ai-Min,
LANG Xue et al
.2016.Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake.Chinese Journal Of Geophysics,59(3): 952-958,doi: 10.6038/cjg20160317
汶川地震前的地磁场日变化特征分析
张凌1, 杜爱民2, 郎雪2,3, 张铁龙4, 杨冬梅5, 赵旭东5
1. 中国地震应急搜救中心, 北京 100049;
2. 中国科学院地质与地球物理研究所, 北京 100029;
3. 中国科学院大学, 北京 100049;
4. Space Research Institute, Austrian Academy of Sciences, Graz, Austria;
5. 中国地震局地球物理研究所, 北京 100081
Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake
ZHANG Ling1, DU Ai-Min2, LANG Xue2,3, ZHANG Tie-Long4, YANG Dong-Mei5, ZHAO Xu-Dong5
1. National Earthquake Response Support Service, Beijing 100049, China;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Space Research Institute, Austrian Academy of Sciences, Graz, Austria;
5. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
The characteristics of the geomagnetic daily variation before the Wenchuan earthquake(ML=8) occurring on 2008 May 12 are analyzed by using of the data from ground-based geomagnetic array. The variation of the electromagnetic induced field associated with the geomagnetic daily variation is also discussed. The conclusions are:1) The morphological characteristics of the geomagnetic diurnal variations observed by Chengdu station(CDP)are similar to that observed by other stations; 2) The ratio of Z/H at CDP is greater than that observed by other neighbor stations,with a maximum of Z/H(>2.5)on April 20; 3) The ratio of Z/H at CDP and Z/H at ENS, RCDP/ENS, increases from April 6, reaches a maximum on April 20, then decreases till May 12. The tendency of variations of RCDP/ENS is more apparent for geomagnetic variations with period of 2-4 h. These results indicate that the geomagnetic variation at CDP is partly associated with the conductivity inner the Earth.
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