Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (1): 181-200.DOI: 10.13745/j.esf.sf.2024.1.25

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Application of the magnetotelluric method in the Sichuan-Yunnan region—a review

DENG Yan1,2(), XU Yuchao3, FAN Ye4, SUN Guicheng5, DONG Zeyi6,*(), HAN Bing6   

  1. 1. Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
    2. The Third Institute, China Electronics Technology Group Corporation, Beijing 100015, China
    3. BGP Offshore, China National Petroleum Corporation, Tianjin 300450, China
    4. China Earthquake Networks Center, Beijing 100045, China
    5. Chengde Earthquake Monitoring Center Station, Chengde 067000, China
    6. State Key Laboratary of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2024-01-21 Revised:2024-01-25 Online:2024-01-25 Published:2024-01-25

Abstract:

Magnetotelluric sounding (MTs, including audio-magnetotelluric, broadband-magnetotelluric and long-period-magnetotelluric) is a geophysical method to probe the near-surface to the upper mantle. Due to its sensitivity to low resistivity bodies, magnetotelluric plays an important role in deep structure, seismogenic environment, geothermal and resource exploration and geodynamics. The Sichuan-Yunnan region, located in the eastern section of the Tethys tectonic domain where many (micro) plates collide and merge, serves as an important channel for the eastward flow of materials and lateral extrusion of blocks within the Tibetan Plateau. The region is an important window to study the regional tectonic deformation, seismogenic environment and material migration due to the mutual cutting and influence of fault zones or suture zones of the plate boundary. This review first gives a brief introduction to the theory of magnetotelluric, then focuses on its application in the Sichuan-Yunnan region as well as the emerging CSELF (control source extremely low frequency) electromagnetic technique in recent years, and finally discusses the application of magnetotelluric in seismogenic environment, volcanic and geothermal activities, metallogenic activities, tectonic and dynamics, and electromagnetic coseismic effects. This review offers a comprehensive perspective on the application of magnetotelluric in the Sichuan-Yunnan region.

Key words: Magnetotelluric, Sichuan-Yunnan region, deep structure, geodynamics, seismoelectromagnetic

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