音频大地电磁接地电阻校正技术研究

doi:10.11720/wtyht.2025.1173

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Abstract

Ground resistance is a significant factor affecting the accuracy of audio-frequency magnetotelluric (AMT) measurements. Hence, reducing the interference from ground resistance is critical for enhancing the reliability and interpretation accuracy of AMT data. By delving into the impacts of ground resistance on the measured electric field, apparent resistivity, and impedance phase, this study proposed a numerical correction method for reducing the impacts of ground resistance to a negligible level. As indicated by the theoretical calculation results, too high ground resistance can reduce the apparent resistivity in high-frequency bands to a quarter of the original value and shift the impedance phase by a maximum of 20°. The correction results of measured data demonstrate that the proposed method can enhance the accuracy of the AMT method in detecting shallow information by effectively reducing the interference from ground resistance. Therefore, this study holds critical significance for improving the application of the AMT method in engineering exploration.

Key words： audio-frequency magnetotelluric (AMT) method ground resistance apparent resistivity impedance phase correction

Received: 19 April 2024 Published: 22 July 2025

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	Articles by authors
	Dong LI
	Ming-Cai ZHANG
	Yuan-Yang WU

Cite this article:

Dong LI,Ming-Cai ZHANG,Yuan-Yang WU. Exploring a correction technology for ground resistance in audio-frequency magnetotelluric measurements[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 614-619.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1173 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/614

Equivalent circuit diagram of receiving loop

Diagram of the relationship between electric field amplitude and grounding resistance

Diagram of the relationship between apparent resistivity and ground resistance

Diagram of the relationship between impedance phase and ground resistance

Grounding resistance of each measuring point on L1 line

Curve of 90 m point apparent resistivity before and after correction

Curve of 580 m point apparent resistivity before and after correction

Impedance phase polar coordinate diagram before L1 line correction

Impedance phase polar coordinate diagram after L1 line correction

Inverted resistivity profile before correction of L1 line

Inverted resistivity profile after correction of L1 line

The catalog data of ZK204

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