| 汶川地震前的地磁场日变化特征分析 |
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| 引用本文： | 张凌,杜爱民,郎雪,张铁龙,杨冬梅,赵旭东.汶川地震前的地磁场日变化特征分析[J].地球物理学报,2016,59(3):952-958. |
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| 作者姓名： | 张凌 杜爱民 郎雪 张铁龙 杨冬梅 赵旭东 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展计划(2014CB845903)、国家重大科研装备研制项目(ZDYZ2012-1)和国家自然科学基金(41174122)资助. |
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| 摘 要： | 近来很多学者报道强地震前地磁日变化异常现象.本文利用地面地磁观测台站分析了2008年5月12日汶川ML=8地震前约37天的地磁场的日变化特征,探讨了地震前地下电磁感应磁场的相对变化.分析结果表明:1)在地震之前,成都台(CDP)观测到地磁日变化的形态与其他台站相似,未见与地震相关变化;2)CDP的Z/H高于周边台站,在4月20日Z/H出现一个最大峰值(2.5);3)以4月20日为分界点,成都CDP台站的Z/H与恩施ENS台的Z/H的比值RCDP/ENS先增加后降低,周期越短变化趋势越明显.这些结果间接反映了震前CDP台地球内部电导率的变化信息.
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| 关 键 词： | 汶川地震 地磁日变化 地球内部电导率 |
| 收稿时间： | 2015-08-18 |
Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake |
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| ZHANG Ling,DU Ai-Min,LANG Xue,ZHANG Tie-Long,YANG Dong-Mei,ZHAO Xu-Dong.Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake[J].Chinese Journal of Geophysics,2016,59(3):952-958. |
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| Authors: | ZHANG Ling DU Ai-Min LANG Xue ZHANG Tie-Long YANG Dong-Mei ZHAO Xu-Dong |
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| Institution: | 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 |
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| Abstract: | 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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| Keywords: | Wenchuan earthquake Geomagnetic diurnal variation Conductivity inner the Earth |
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