| 地电阻率正常变化的初步研究 |
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| 引用本文： | 金安忠.地电阻率正常变化的初步研究[J].地球物理学报,1981,24(1):92-106. |
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| 作者姓名： | 金安忠 |
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| 作者单位： | 山东省地震局 |
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| 摘 要： | 观测地壳浅层电阻率随时间变化以寻找地震信息是地电阻率方法的目的。实际工作中,在保证观测精度的前提下,发现正常（无震）情况的地电阻率仍然存在着复杂的变化,给定量和定性分析地震异常带来相当大的困难。 本文分析了一些台站正常地电阻率的变化规律,并在此基础上提出“变化电性剖面模式”,来阐明一些台站正常地电阻率变化的复杂过程及其产生的可能原因。从此观点出发,导出以二层电性剖面为特征的台站正常地电阻率相对似年变化幅度公式。通过典型计算,提出获取平稳的正常原始资料是解决上述困难问题的方向,并指出了获取平稳正常变化资料的具体途径。
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| 关 键 词： | 地电阻率 正常变化 电性剖面 台站 年变幅 极距 似稳 岩石电阻率 年变化 表层电阻 |
| 收稿时间： | 1979-03-19 |
PRELIMINARY STUDY OF THE NORMAL CHANGES OF EARTH'S ELECTRICAL RESISTIVITY |
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| JIN AN-ZHONG.PRELIMINARY STUDY OF THE NORMAL CHANGES OF EARTH'S ELECTRICAL RESISTIVITY[J].Chinese Journal of Geophysics,1981,24(1):92-106. |
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| Authors: | JIN AN-ZHONG |
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| Affiliation: | Seismological Bureau of Shandong Province |
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| Abstract: | We used the method of ground resistivity measurement to show the variation with time of the earth's electrical resistivity near the surface as the precursor of an earthquake. It has been found that the variation of the resistivity is really very complicated even under conditions of no earthquake and assured accuracy of measurement, thus making the quantitative or even qualitative analysis of the resistivity variation rather difficult.In this paper, the data of variations of earth resistivity observed at a number of stations were analysized for empirical regularities, and on the basis of which a "model of profile section of varying resistivity" was proposed to describe the complex nature and the possible cause of the variation of resistivity in case no earthquake is to occur. From this model section, a formula is obtained for calculating the amplitude of relative apparent annual variation of resistivity at a station characterized by two resistivity layers. Through computations, it is found that, the use of stationary variations of resistivity data might be a possible way to resolve the above difficulty and a concrete method of its application is given. |
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