| 代县地电阻率降雨影响及数值模拟 |
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| 引用本文： | 郭文峰,曹志勇,王海龙.代县地电阻率降雨影响及数值模拟[J].地震地磁观测与研究,2019,40(2):62-70. |
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| 作者姓名： | 郭文峰 曹志勇 王海龙 |
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| 作者单位： | 中国太原 030021 山西省地震局;中国山西 030024 太原理工大学;中国太原 030002 中国冶金地质总局第三地质勘察院 |
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| 基金项目： | 山西省地震局2018年度青年科研项目（项目编号：SBK-1824）；中国地震局震情跟踪项目（项目编号：2018020304） |
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| 摘 要： | 多年观测数据表明,代县地电阻率年变受降雨影响比较显著,通过褶积滤波法获取降雨量对视电阻率的影响值,定量分析降雨与视电阻率的相关性。在此基础上,利用代县地电阻率电测深数据及相关地质资料,建立三维有限元模型,模拟降雨对地电阻率的影响,进一步确定降雨对视电阻率影响的物理机制。结果表明:降雨是造成代县地电阻率年变的主要因素,且与视电阻率呈正相关性;降雨造成表层介质含水饱和度发生变化,使得相应电阻率下降近10倍,从而引起地电阻率年变幅度发生近1/10的改变。
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| 关 键 词： | 降雨 褶积滤波 表层介质 电阻率增大系数 视电阻率 数值模拟 |
Rainfall effect and numerical simulation of apparent resistivity in Daixian |
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| Guo Wenfeng,Cao Zhiyong,Wang Hailong.Rainfall effect and numerical simulation of apparent resistivity in Daixian[J].Seismological and Geomagnetic Observation and Research,2019,40(2):62-70. |
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| Authors: | Guo Wenfeng Cao Zhiyong Wang Hailong |
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| Institution: | 1.Shanxi Earthquake Agency, Taiyuan 030021, China;2.Taiyuan University of Technology, Shanxi Province 030024, China;3.The Third Geological Exploration Institute of China Metallurgical Geology Bureau, Taiyuan 030002, China |
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| Abstract: | Many years of observational data show that the annual change of apparent resistivity in Daixian is significantly affected by rainfall. In this paper, the influence of rainfall on apparent resistivity is obtained by convolution filtering, and the correlation between rainfall and apparent resistivity is quantitatively analyzed. On the basis of the above analysis, the three-dimensional finite element model was established based on the vertical electric soundings in Daixian and relevant geological data and the influence of rainfall on apparent resistivity was simulated. The physical mechanism of the effect of rainfall on apparent resistivity was further determined. The results show that rainfall is the main factor causing the annual change of resistivity in Daixian which is positively correlation with apparent resistivity. Rainfall causes the water saturation of the surface medium to change and make the resistivity reduce nearly ten times. As a result, the annual amplitude of apparent resistivity changes by nearly one-tenth. |
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| Keywords: | rainfall convolution filtering the surface medium resistivity index apparent resistivity numerical simulation |
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