| 强地震附近电阻率对称四极观测的探测深度 |
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| 引用本文： | 杜学彬,叶青,马占虎,李宁,陈军营,谭大诚.强地震附近电阻率对称四极观测的探测深度[J].地球物理学报,2008,51(6):1943-1949. |
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| 作者姓名： | 杜学彬 叶青 马占虎 李宁 陈军营 谭大诚 |
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| 作者单位： | 1.中国地震局兰州地震研究所,兰州 730000;2.中国地震局地震预测研究所兰州创新基地,兰州 730000;3.中国地震台网中心,北京 100045 |
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| 基金项目： | 中国地震局地震科学联合基金
，
家科技支撑计划课题
，
地震行业科研专项基金
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| 摘 要： | 针对我国地震监测预报中固定地点和固定观测装置及参数的视电阻率观测，给出了半空间倾斜各向异性介质中电阻率对称四极观测的理论探测深度，研究了地震前兆信息的检测深度问题，得到：(1)在强地震、孕震晚期阶段，在震中区及附近可检测到地壳近地表较深部介质的电阻率变化，其深度大于或远大于均匀介质之；(2)震级、震中距、观测方向不同或在不同的孕震阶段，探测深度存在差异，甚至存在大的差异，且是动态变化的.并依据理论探测深度讨论了地震视电阻率前兆变化的复杂性、地电台址电性条件等问题.
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| 关 键 词： | 强地震 附近 孕震晚期 视电阻率 对称四极 各向异性 探测深度 |
| 收稿时间： | 2008-2-14 |
| 修稿时间： | 2008-6-16 |
The detection depth of symmetric four-electrode resistivity observation in/near the epicentral region of strong earthquakes |
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| DU Xue-Bin,YE Qing,MA Zhan-Hu,LI Ning,CHEN Jun-Ying,TAN Da-Cheng.The detection depth of symmetric four-electrode resistivity observation in/near the epicentral region of strong earthquakes[J].Chinese Journal of Geophysics,2008,51(6):1943-1949. |
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| Authors: | DU Xue-Bin YE Qing MA Zhan-Hu LI Ning CHEN Jun-Ying TAN Da-Cheng |
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| Institution: | 1.Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;2.Lanzhou Base of Earthquake Science Institute, China Earthquake Administration, Lanzhou 730000, China;3.China Earthquake Network Centre, Beijing 100045, China |
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| Abstract: | In consideration of China′s observation of apparent resistivity at fixed sites with fixed electrode arrays for earthquake monitoring and prediction, we produced the theoretical detection depth for the symmetric four-electrode resistivity observation in the half-space of sloping and anisotropic medium, and researched the depth to detect the apparent resistivity precursory related to earthquake, and thus, obtained the following results: (1) In the late preparation period of strong earthquakes, the changes in apparent resistivity in the underground deep place could be recorded in/near the epicentral region, which is far deeper than that in homogeneous medium; (2) The detection depth is different for different magnitudes of earthquake, different epicentral distances and in different measuring directions or in different stages of earthquake preparation, the difference could be very large and varies dynamically. Besides, we discussed the problems of the complexity of precursory changes in apparent resistivity and the ground electrical condition of the station site in observation of apparent resistivity based on the theoretical detection depth. |
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| Keywords: | Strong earthquake Vicinity Late period of earthquake preparation Apparent resistivity Symmetry four-electrode Anisotropy Detection depth |
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