| 新疆和田ML7.1地震前ULF电磁辐射的激发机理 |
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| 引用本文： | 杜爱民,周志坚,徐文耀,杨少峰. 新疆和田ML7.1地震前ULF电磁辐射的激发机理[J]. 地球物理学报, 2004, 47(5): 832-837 |
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| 作者姓名： | 杜爱民 周志坚 徐文耀 杨少峰 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029;中国科学院青藏高原研究所,北京,100085;中国农业大学数理学院,北京,100083;中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金青年基金项目 ( 4 0 3 0 40 13 )，国家自然科学基金重点项目 ( 4 0 2 3 60 5 8) |
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| 摘 要： | 1996年11月19日新疆和田地区发生了ML=7.1地震. 在这次地震发生前，观测到了地震的超低频（ULF）电磁辐射前兆. 电磁辐射前兆的特点是电位漂移、极化椭圆主轴的垂直方向指向震中和大幅度的电磁辐射. 本文根据电磁辐射特征建立了地震电磁辐射前兆垂直电偶极子模型，并且给出了观测结果的物理解释. 偶极子产生一个不稳定的静电场使水平分量的电位日均值发生明显漂移，震前电偶极子中电荷复合放电产生的随机弱电磁噪声造成在ULF频段上水平分量偏振主轴方向偏转. 喀什台站和安西台站观测到的电势比值与模型估计值相近，从水平分量判断出偶极子间电流方向向下，与垂直电偶极子模型一致.
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| 关 键 词： | 激发机制 ULF地磁前兆 地震 新疆和田 |
| 文章编号： | 0001-5733(2004)05-0832-06 |
| 收稿时间： | 2003-07-04 |
| 修稿时间： | 2004-04-15 |
Generation mechanisms of ULF electromagnetic emissions before the ML=7.1 earthquake at Hotan of Xinjiang |
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| DU Ai-Min , ZHOU Zhi-Jian XU Wen-Yao YANG Shao-Feng Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing ,China Institute of Mathematics and Physics,China Agriculture University,Beijing ,China. Generation mechanisms of ULF electromagnetic emissions before the ML=7.1 earthquake at Hotan of Xinjiang[J]. Chinese Journal of Geophysics, 2004, 47(5): 832-837 |
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| Authors: | DU Ai-Min ZHOU Zhi-Jian XU Wen-Yao YANG Shao-Feng Institute of Geology Geophysics Chinese Academy of Sciences Beijing China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China Institute of Mathematics Physics China Agriculture University Beijing China |
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| Affiliation: | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Institute of Tibetan Plateau Research,Chinese Academy of Sciences，Beijing 100085, China 3 Institute of Mathematics and Physics, China Agriculture University, Beijing 100083, China |
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| Abstract: | The earthquake M L7.1 took place at Hotan of Xinjiang province on Oct.19, 1996. Three types of Ultralow frequency(ULF) electromagnetic precursors were observed before the earthquake: (1) drift of dynamic zeros, (2) the vertical direction of the major axis of the polarization ellipse orientated to the epicenter, and (3) large amplitude of ULF electromagnetic radiation. A simple model for the generation mechanism of these precursors is proposed. Based on this model, we explain the effect of static electric field inducted by dipole on the variation of voltage and direction of axis on polarization ellipse for horizontal components. |
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| Keywords: | Generation mechanism ULF electromagnetic precursor Earthquake Hotan. |
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