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地震 ›› 2007, Vol. 27 ›› Issue (增刊): 9-18.

• 地电阻率研究 • 上一篇    下一篇

地电阻率多极距观测试验研究

钱家栋1, 毛先进2, 赵家骝1, 赵庆福3, 袁慎杰3, 杨建军2   

  1. 1.中国地震局地震预测研究所, 北京 100036;
    2.云南省地震工程研究院, 云南 昆明 650224;
    3.南京市江宁区地震办公室, 江苏 南京211100;
    4.南京市地震局, 江苏 南京210008
  • 收稿日期:2007-01-31 修回日期:2007-03-12 出版日期:2007-06-30 发布日期:2021-10-29
  • 作者简介:钱有栋(1940-), 男, 江苏南京市人, 研究员, 主要从事地震电磁学、 地震预报等研究。
  • 基金资助:
    国家科技部基础平台重点项目(2004DEA71000)

Tentative studies on the observation of multiple separation array of geoelectrical resistivity

QIAN Jia-dong1, MAO Xian-jin2, ZHAO Jia-liu1, ZHAO Qing-fu3, YUAN Shen-jie3, YANG Jian-jun4   

  1. 1. Institute of Earthquake Sciences, CEA, Beijing 100036;
    2. Institute of Earthquake Engineering of Yunnan province, Kunming;
    3. Office for Earthquake monitoring of Jiangning District, Nanjing;
    4. Earthquake Administration of Nanjing, Najing, China
  • Received:2007-01-31 Revised:2007-03-12 Online:2007-06-30 Published:2021-10-29

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摘要： 该文介绍了在南京江宁区地震台开展的地电阻率多极距观测试验的结果。 试验结果表明, 在2006年2~10月的8个多月观测中, 所有5套极距的地电阻率观测从5月底起均显示了不同程度的趋势性下降, 在2个月时间里下降幅度在2％～4％不等, 与当时开始的季节性因素影响(农田浇水过程)有明显统计上的关联。 但无法认识介质内部的物理过程, 即浇水影响介质电性变化的部位和大小。 通过反演求得了真电阻率随时间变化的进程: 在5月底开始的浇水过程的影响下, 介质内部不同部位电阻率变化差异悬殊: 第一层(表层)的变化最大, 达到6.5%; 而第三层(底层)仅为1％, 达到了使设置于地表的地电阻率变化物理原因清晰化和定位化的目的。 这为人们认识产生这些电阻率变化的真实物理原因, 提供了重要的借鉴, 体现了地电阻率多极距观测的优越性所在, 是实现地电阻率观测从图像预测向物理预测前进的重要途径。 通过试验还讨论了场地勘选、 极距数目的确定、 地电阻率时间变化的反演方法和反演误差分析等与推进地电阻率多极距观测有关的重要的理论和实际问题。

关键词: 地电阻率, 多极距观测, 地震前兆观测, 江宁地震观测台

Abstract: This paper deals with the results of the tentative studies on the observation of multiple separation array of geoelectrical resistivity in the earthquake monitoring station of Jiangning District, Nanjian city, Jiangsu Province. The results indicate that during the tentative observation for 8 months from Feb. to Oct. 2006, there were two months′ synchronous descending of apparent resistivities in the 5 seperation arrays since the end of May 2006, with the variations 4%～2%, which could be obviously correlated with the seasonal changes in the statistics, irrigating process in the observation field at the same time. One could not realize, however, what happened inside the medium during the irrigating process, in other words, where and how large the inference of the electrical properties caused by the process could be. The results of the changes of true resistivits with time in terms of the inversion definitely indicate that the variation of the ture resistivity at the different depths shows big difference: one of the top layer with maximum of 6.5％ and the one of bottom layer with only 1% , which clearly indicate the localization and quatitalizition in ture resistivities by the process.The results show a good prospect from image forecast to the physicai prediction in earthquake studies. This paper also deals with some important issues about the method of multipal separation array of geoelectrical resistivity, such as field inspection, the determination of the number of separations, the method for inversion of the temporal changes of geoelectrical resistivity to ture resistivity and the errors in the inversion, and so on.

Key words: Geoelectrical resistivity, Observation of multiple separation, Observation of earthquake precursor, Seismic observatry of Jiangning

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