Volume 27 Issue 2
Apr.  2021
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Article Navigation >  Journal of Geomechanics  > 2021  >  27(2): 317-325
LI Zhong, WU Zhonghai, WANG Jinming, et al., 2021. Using EH4 audio-magnetotelluric sounder to detect the gigantic Qiaojia paleo-landslide and its structural characteristics. Journal of Geomechanics, 27 (2): 317-325. DOI: 10.12090/j.issn.1006-6616.2021.27.02.029
Citation: LI Zhong, WU Zhonghai, WANG Jinming, et al., 2021. Using EH4 audio-magnetotelluric sounder to detect the gigantic Qiaojia paleo-landslide and its structural characteristics. Journal of Geomechanics, 27 (2): 317-325. DOI: 10.12090/j.issn.1006-6616.2021.27.02.029
shu

Using EH4 audio-magnetotelluric sounder to detect the gigantic Qiaojia paleo-landslide and its structural characteristics

doi: 10.12090/j.issn.1006-6616.2021.27.02.029
  • 1.

    Yunnan Geological Survey, Kunming 650216, Yunnan, China

  • 2.

    Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, MNR, Kunming 650051, Yunnan, China

  • 3.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 4.

    Guiding Center of Geo-hazards Prevention and Mitigation Techniques, Ministry of Natural Resources, Beijing 100081, China

Funds:

the China Geological Survey Project DD20160268

Key Projects of Yunnan United Fund U2002211

More Information
  • Received: 2020-11-30
  • Revised: 2021-01-15
  • Published: 2021-04-28
    Abstract
  • In this study, we used the EH4 audio-magnetotelluric sounding, combining with the drilling data, to detect and define the spatial electrical properties and structural characteristics of the Qiaojia paleo-landslide. Based on the detection results, the average depth of the main sliding surface is considered to be 250 m and six faults (F1-F6) were identified, among which the Xiaojiang fault zone (F1) is the main active fault. Meanwhile, it is inferred from the sounding results and drill date that the terrace along the Jinsha River fall into four layers from the surface (Qh) to the deep, namely the sandy clay layer, gravel layer, broken limestone layer, and complete limestone bedrock. The broken limestone layer and the complete limestone bedrock are in the bedrock outcrop area from the surface to the deep. The comprehensive analysis shows that the paleo-landslide is temporarily stable at present, but along with large earthquake activity in the north section of Xiaojiang fault zone in the future, whether the paleo-landslide is likely to revive or similar paleo-landslides will reoccur in this region needs further study. Our study proved the effectiveness of the EH4 audio-magnetotelluric method in detecting gigantic paleo-landslide.

     

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