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| Technical progress of processing methods for magnetotelluric sounding data |
| ZHANG Kun1,2,3,4, LIU Lei5, MA Xingzhi1,2, YANG Yufan1,2 |
1. Chinese Academy of Geological Sciences,Beijing 100037,China;
2. Laboratory of Deep Earth Sciences and Technology of Ministry of Natural Resources, Beijing 100037, China;
3. East China Institute of Technology, Jiangxi Nanchang, 330013, China;
4. Key Laboratory of Geophysical Electromagnetic Probing Technologies of Ministry of Natural Resources, Hebei Langfang 065000, China;
5. Geophysical Exploration Brigade of Hubei Geological Bureau, Hubei Wuhan 430056, China |
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Abstract The magnetotelluric sounding method is widely used in researches on geodynamics, metallogenic system, deep exploration of mineral resource and clean/oil energy and investigation of geological disaster, due to its advantages of large detection depth, penetrating high resistance layers, portable performance and low cost. However, the performance of this method is weak in natural electromagnetic field signals observation, which is easily interfered by noise. The effective electrical information is obtained by long-term observation and multiple superposition, and the related data processing and analysis methods were used to obtain reliable geo-electrical results. Data processing usually includes time-frequency conversion, denoising, estimation of impedance tensor and tipper vector, and data analysis includes electrical strike direction and medium dimension analysis. In this paper, the authors summarized the widely used processing methods for magnetotelluric sounding data, based on previous research and introduced the forefront research directions and achievements focusing on denoising in data processing and impedance and phase tensor in data analysis. The characteristics and advantages of the existing methods, and the applicability to geomagnetic field observation data under different environments and backgrounds were analyzed to provide theorical information and basic guarantee for effective and efficient application of magnetotelluric sounding.
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Received: 22 January 2024
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2024, Vol. 11 
