物探与化探2025，Vol.49Issue(5)：1126-1132,7.DOI:10.11720/wtyht.2025.1444
音频大地电磁测深法数据质量监控
Data quality monitoring of the audio-frequency magnetotelluric method:Analysis of factors influencing data quality based on EH4 measurement electrodes
摘要
Abstract
The Audio-frequency Magnetotelluric(AMT)sounding method is an electrical exploration technique widely used for shallow to medium-depth geological investigations.Its data quality is influenced by various factors,including cultural electromagnetic interfer-ence,electrode polarization,and grounding resistance.This study focuses on the impact of electrode polarization and grounding resist-ance on AMT data quality.First,the mechanisms of electrode polarization and the influence of grounding resistance on apparent resis-tivity and impedance phase are theoretically analyzed.Then,based on measured data,the effects of electrode polarization and ground-ing resistance on apparent resistivity and phase curves are investigated.Finally,a comparative analysis of 2D inversion results from field data is conducted to reveal how grounding resistance affects geological interpretation.The results indicate that electrode polariza-tion significantly degrades data quality in the low-frequency band,though this can be mitigated through data processing techniques,while its effect on high-frequency data is negligible.Unstable grounding resistance mainly influences the high-frequency range,causing notable reductions in apparent resistivity and phase,which gradually stabilize toward the low-frequency band.Moreover,unstable grounding resistance may lead to inversion results that deviate from the true geoelectrical structure,thereby resulting in erroneous geo-logical interpretations.The findings of this study provide important guidance for field data acquisition and processing.关键词
音频大地电磁测深/数据质量/测量电极/电极极化/接地电阻/地质解释Key words
audio-frequency magnetotelluric(AMT)method/data quality/measurement electrode/electrode polarization/ground re-sistance/geological interpretation分类
天文与地球科学引用本文复制引用
林家勇,徐志敏,周聪..音频大地电磁测深法数据质量监控[J].物探与化探,2025,49(5):1126-1132,7.基金项目
云南省教育厅科学研究基金项目(2022J1377) （2022J1377）
国家自然科学基金项目(42364006) （42364006）
