地电阻率仪温度特性与观测日变化现象的关系分析

doi:10.12196/j.issn.1000-3274.2023.02.005

Abstract

Abstract: In the geo-electrical resistivity observations, at some stations have a diurnal variation phenomenon, which has a good correlation with the diurnal variation of ambient temperature. However, temperature variation not only affects the resistivity of shallow media, but also may have a certain impact on observation meter. This paper analyzes the influence of the sampling resistance characteristics of the current measurement of the geo-electrical resistivity meter and the influence of the geo-electrical resistivity meter on the measured value of the geo-electrical resistivity when the temperature changes from both theoretical calculations and ring model temperature experiments. From the perspective of the impact of temperature on the observation results, the diurnal variation in the actual observation of the geo-electrical resistivity station was analyzed using the Lanlongkou station, Qinghai Province as an example. The temperature characteristics of the geo-electrical resistivity meter were used at Lanlongkou station to remove the impact of temperature on the observation host. After correction, the measured result of geo-electrical resistivity only changes by 0.03%, which has a minimal impact compared to the 0.25% diurnal variation amplitude. This indicates that temperature-induced changes in the resistivity meter are not the primary factor causing diurnal variations in geo-electrical resistivity, providing a basis for future research on the causes of these variations.

Key words: Geo-electrical resistivity observation, Temperature characteristics, Diurnal variation, Sampling resistance

CLC Number:

P319.3

LOU Xiao-yu, ZHANG Yu, ZHANG Xing-guo, ZHANG Shi-zhong, HU Zhe. Analysis of the Relationship between Temperature Characteristics of Geo-electrical Resistivity Meter and the Observed Diurnal Variation[J]. EARTHQUAKE, 2023, 43(2): 46-59.

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Analysis of the Relationship between Temperature Characteristics of Geo-electrical Resistivity Meter and the Observed Diurnal Variation

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