地质与勘探2025，Vol.61Issue(3)：508-516,9.DOI:10.12134/j.dzykt.2025.03.007
高密度电阻率法和音频大地电磁法在西藏沃达滑坡区的组合应用
Combined Application of High-Density Resistivity Method and Audio-Frequency Magnetotelluric Method in the Woda Landslide Area of Xizang
摘要
Abstract
The ancient Woda landslide in the upper reaches of the Jinsha River in Xizang is currently in a reactivated creep stage.To determine the sliding range,trend,and depth of the sliding surface in the landslide area,this study deployed three high-density resistivity method(ERT)survey lines and three audio-frequency magnetotelluric sounding(AMT)survey lines along the direction of slope creep.The inversion results of the three AMT and ERT profiles indicate the presence of a low-resistivity slip-prone zone in the shallow layer of the study area.The low-resistivity medium is continuously distributed along the L1 and L2 lines,while it is sporadically distributed along the L3 line.The high-density resistivity method is more accurate in detecting the spatial distribution characteristics of the creeping body,while the AMT method has advantages in inferring bedrock morphology,lithological composition,and fault detection.By combining the strengths of the AMT and ERT inversion profiles,the sliding surface and distribution morphology of the creeping body were roughly inferred.The depth of the sliding surface may range from a shallow depth of over ten meters to a deeper depth of over fifty meters.The lithology of the survey line layout area is mainly slate and carbonaceous shale,with the development of reverse faults,which is consistent with previously published geological data and remote sensing results.This demonstrates that the combined electrical exploration of the high-density resistivity method and AMT can accurately identify the underground electrical structure of the landslide area and serve the prediction of the landslide body's range and trend.Finally,the consistency between the electrical method and InSAR in detection and understanding is elucidated.关键词
高密度电阻率法(ERT)/音频大地电磁测深法(AMT)/岩性组成/滑动面/沃达滑坡/西藏Key words
high-density resistivity method(ERT)/audio-frequency magnetotelluric sounding(AMT)/lithological composition/sliding surface/Woda landslide/Xizang分类
天文与地球科学引用本文复制引用
李于波,仇根根,王大勇,李明威,佘一民,王蒙蒙,张格格..高密度电阻率法和音频大地电磁法在西藏沃达滑坡区的组合应用[J].地质与勘探,2025,61(3):508-516,9.基金项目
中央级公益性科研院所基本科研业务费项目"西南地区典型滑坡三维速度结构与灾害风险评价研究"(编号:AS2022J02)资助. （编号:AS2022J02）
