合肥形变台地电阻率NS向数据异常的解释

doi:10.12196/j.issn.1000-3274.2022.03.013

地震 ›› 2022, Vol. 42 ›› Issue (3): 180-191.doi: 10.12196/j.issn.1000-3274.2022.03.013

合肥形变台地电阻率NS向数据异常的解释

于磊¹, 陈俊², 何康², 刘泽民², 黎哲君³

1.安徽省合肥地震监测中心站, 安徽合肥 231607;
2.安徽省地震台, 安徽合肥 230031;
3.安徽省郯庐大别研究中心, 安徽合肥 230031

收稿日期:2021-07-23 修回日期:2022-01-28 发布日期:2023-03-29
通讯作者: 陈俊, 高级工程师。 E-mail: shanyejunjie@163.com
作者简介:于磊(1983-), 男, 安徽阜阳人, 硕士研究生, 主要从事地震电磁、地震应急、热红外遥感研究。
基金资助:
地震科技星火计划攻关项目(XH20024); 中国地震局地震应急青年重点任务项目(CEA_EDEM-2022); 地震科技星火计划青年项目(XH23021YB)

Explanation for the Anomalies of the Ground Resistivity in NS Direction at Hefei Deformation Station

YU Lei¹, CHEN Jun², HE Kang², LIU Ze-min², LI Zhe-jun³

1. Hefei Earthquake Monitoring Center Station, Hefei 231607, China;
2. Anhui Seismic Station, Hefei 230031, China;
3. Tanlu Dabie Research Center of Anhui Province, Hefei 230031, China

Received:2021-07-23 Revised:2022-01-28 Published:2023-03-29

摘要/Abstract

摘要： 合肥形变台地电阻率NS向和EW向数据呈反向变化, 但2018年10月至2019年2月两方向数据出现正向变化。经检查NS向供电级和测量极之间有一水塘, 2018年10月水塘进行抽水拉渔致水位大幅降低。此时NS向数据不升高反而降低, 形成似是而非的“悖论”。本文利用有限元数值分析方法计算三维影响系数, 计算结果显示: 合肥形变台NS向电阻率观测, 在地表供电极和测量极之间, 以及沿测线剖面上供电极和测量极之间存在影响系数为负值的近似半椭球区域, 越靠近电极影响系数的绝对值越大。据此得到结论: 此次数据异常变化为水塘抽水引起, 计算结果与实际观测数据变化相同, 从而进行了“解悖”。分析结果可为以后类似问题的解决提供参考。

关键词: 三维影响系数, 有限元, 解悖, 层状介质

Abstract: The earth resistivity always shows reverse change in NS direction and EW direction at Hefei deformation station, however the data of the two directions showed positive change from October 2018 to February 2019. After checking, it is found that there is a reservoir between the NS power supply level and the measuring pole, and in October 2018 the water level of the reservoir was significantly reduced due to pumping. At this time, the resistivity at NS direction did not increase but decrease that formed a paradox. In this paper, the three-dimensional influence coefficient is calculated by using finite element numerical analysis method. The results show that there is a negative region between the supply electrode and the measuring electrode, and a semi-ellipsoid region along the measuring profile. The closer it is to the electrode, the longer the absolute value of influence coefficient becomes. It is concluded that the abnormal change in NS resistivity is caused by the pumping of water from the reservoir, and the calculated results are consistent to the observed data. This result provides reference for solving similar problems in the future.

Key words: Three-dimensional influence coefficient, Finite element, Solution paradox, Layered medium

中图分类号:

P315.7

于磊, 陈俊, 何康, 刘泽民, 黎哲君. 合肥形变台地电阻率NS向数据异常的解释[J]. 地震, 2022, 42(3): 180-191.

YU Lei, CHEN Jun, HE Kang, LIU Ze-min, LI Zhe-jun. Explanation for the Anomalies of the Ground Resistivity in NS Direction at Hefei Deformation Station[J]. EARTHQUAKE, 2022, 42(3): 180-191.

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合肥形变台地电阻率NS向数据异常的解释

Explanation for the Anomalies of the Ground Resistivity in NS Direction at Hefei Deformation Station

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