首页|Spatial structural characteristics of the Deda ancient landslide in the eastern Tibetan Plateau:Insights from Audio-frequency Magnetotellurics and the Microtremor Survey Method

Spatial structural characteristics of the Deda ancient landslide in the eastern Tibetan Plateau:Insights from Audio-frequency Magnetotellurics and the Microtremor Survey Method

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It is of crucial importance to investigate the spatial structures of ancient landslides in the eastern Tibetan Plateau's alpine canyons as they could provide valuable insights into the evolutionary history of the landslides and indicate the potential for future reactivation.This study examines the Deda ancient landslide,situated in the Chalong-ranbu fault zone,where creep deformation suggests a complex underground structure.By integrating remote sensing,field surveys,Audio-frequency Magnetotellurics(AMT),and Microtremor Survey Method(MSM)techniques,along with engineering geological drilling for validation,to uncover the landslide's spatial features.The research indicates that a fault is developed in the upper part of the Deda ancient landslide,and the gully divides it into Deda landslide accumulation zone I and Deda landslide accumulation zone Ⅱ in space.The distinctive geological characteristics detectable by MSM in the shallow subsurface and by AMT in deeper layers.The findings include the identification of two sliding zones in the Deda I landslide,the shallow sliding zone(DD-I-S1)depth is approximately 20 m,and the deep sliding zone(DD-I-S2)depth is 36.2-49.9 m.The sliding zone(DD-Ⅱ-S1)depth of the Deda Ⅱ landslide is 37.6-43.1 m.A novel MSM-based method for sliding zone identification is proposed,achieving less than 5％discrepancy in depth determination when compared with drilling data.These results provide a valuable reference for the spatial structural analysis of large-deep-seated landslides in geologically complex regions like the eastern Tibetan Plateau.

Ancient landslideRemote sensingAudio-frequency Magnetotellurics(AMT)Microtremor Survey Method(MSM)Geological drilling engineeringSpatial structureTibetan PlateauGeological hazard survey engineering

Zhen-dong Qiu、Chang-bao Guo、Yi-ying Zhang、Zhi-hua Yang、Rui-an Wu、Yi-qiu Yan、Wen-kai Chen、Feng Jin

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

Faculty of Engineering,China University of Geosciences,Wuhan 430074,China

Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China

Research Center of Neotectonism and Crustal Stability,China Geological Survey,Beijing 100081,China

China Water Resources Beifang Investigation,Design and Research Co.Ltd.,Tianjin 300222,China

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National Natural Science Foundation of ChinaChina Geological Survey ProjectChina Geological Survey Project

42372339DD20221816DD20190319

2024

10.31035/cg2023129

中国地质(英文)
中国地质调查局,中国地质科学院

中国地质(英文)

CSTPCD
ISSN：2096-5192
年,卷(期)：2024.7(2)
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