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

Abstract

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

CLC Number:

P315.75

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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Quantitative Analysis of Disturbance Caused by Metal Pipes in Xiangyun Apparent Resistivity Station

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