金属管道对祥云观测站地电阻率干扰的定量分析

doi:10.12196/j.issn.1000-3274.2025.03.006

摘要/Abstract

摘要： 祥云站地电阻率观测EW和NS测道在2022年4月30日至8月期间出现类似临震异常的快速下降变化, 之后观测数据的同步下降并未恢复, 且年变幅度较此前显著增大。经测区现场环境调查发现, 快速下降期间测区内铺设了用于农田灌溉的金属管道。结合祥云站电测深资料, 采用有限元数值计算方法, 分析了金属管道对观测数据的静态和动态影响。分析结果表明: 金属管道铺设前后地电阻率变化的计算值与实际观测变化幅度基本一致, 说明此次下降变化为金属管道铺设引起的干扰, 并非地震前的异常变化; 在夏季浅层介质电阻率降低时, 金属管道对观测的影响增大, 冬季浅层电阻率升高时影响减小, 从而引起观测数据年变化幅度的增加, 计算结果与实际观测数据的变化趋势较为一致。

关键词: 祥云观测站, 地电阻率, 金属管道, 干扰

Abstract: From April 30 to August 2022, the apparent resistivity observed along the EW- and NS- arrays at Xiangyun Station exhibited a rapid decline resembling a pre-seismic anomaly. This synchronous drop in the data did not recover afterward, and the amplitude of annual variation increased significantly compared to previous levels. Based on the on-site environmental investigation, it was found that metal pipes for farmland irrigation were laid in the survey area during the period of rapid decline. By integrating electrical sounding data from Xiangyun Station, this study employs the finite element numerical calculation method to analyze the static and dynamic effects of metal pipes on observation data. The analysis results show that the calculated changes in apparent resistivity before and after the installation of metal pipes are consistent with the actual observed variations, indicating that the decrease was caused by interference from the metal pipelines, rather than abnormal changes before the earthquake; when the resistivity of shallow media decreases in summer, the influence of metal pipelines on the observations increases. When the resistivity of shallow media increases in winter, the influence decreases, leading to an increase in the annual variation amplitude of the observation data. The calculated results align with the actual observed variation trend.

Key words: Xiangyun station, Apparent resistivity, Metal pipes, Interference

中图分类号:

P315.75

韩盈, 范晔, 于晨, 解滔. 金属管道对祥云观测站地电阻率干扰的定量分析[J]. 地震, 2025, 45(3): 87-100.

HAN Ying, FAN Ye, YU Chen, XIE Tao. Quantitative Analysis of Disturbance Caused by Metal Pipes in Xiangyun Apparent Resistivity Station[J]. EARTHQUAKE, 2025, 45(3): 87-100.

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