Application of portable frequency domain three-dimensional electromagnetic inversion in urban geological survey

JianXin LIU, HaiJian HUA, ZhanHui QING, RongWen GUO, Rong LIU

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 328-336.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 328-336. DOI: 10.6038/pg2025HH0562

Application of portable frequency domain three-dimensional electromagnetic inversion in urban geological survey

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Abstract

The portable frequency domain electromagnetic detection instrument has been widely used in the field of urban near-surface exploration because of its high sensitivity, strong anti-interference ability, simple operation and high measurement efficiency. Due to the smaller scale of urban geological exploration targets, three-dimensional inversion is more advantageous than one-dimensional or two-dimensional inversion in terms of data interpretation accuracy. In order to study the effectiveness of the portable frequency domain electromagnetic detection instrument in urban shallow surface exploration and the superiority of 3D inversion, this paper conducts 3D inversion of GEM-2 measured data from a test site in Shanghai, and compares the results with the traditional 1D inversion results. The excavation results show the correctness of the 3D inversion algorithm proposed in this paper and the feasibility and superiority of its application in urban underground space detection.

Key words

Urban geological survey / Near-surface exploration / Controllable source electromagnetic method / Three-dimensional inversion

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JianXin LIU , HaiJian HUA , ZhanHui QING , et al . Application of portable frequency domain three-dimensional electromagnetic inversion in urban geological survey[J]. Progress in Geophysics. 2025, 40(1): 328-336 https://doi.org/10.6038/pg2025HH0562

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本文三维反演所用的GEM-2实测数据由上海元易勘探设计有限公司提供, 在此表示感谢.

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