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利用EH4音频大地电磁测深仪探测巧家巨型古滑坡及其结构面特征

李忠 吴中海 汪金明 张小兵 冯振 胡萌萌

李忠, 吴中海, 汪金明, 等, 2021. 利用EH4音频大地电磁测深仪探测巧家巨型古滑坡及其结构面特征. 地质力学学报, 27 (2): 317-325. DOI: 10.12090/j.issn.1006-6616.2021.27.02.029
引用本文: 李忠, 吴中海, 汪金明, 等, 2021. 利用EH4音频大地电磁测深仪探测巧家巨型古滑坡及其结构面特征. 地质力学学报, 27 (2): 317-325. DOI: 10.12090/j.issn.1006-6616.2021.27.02.029
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

利用EH4音频大地电磁测深仪探测巧家巨型古滑坡及其结构面特征

doi: 10.12090/j.issn.1006-6616.2021.27.02.029
基金项目: 

中国地质调查局项目 DD20160268

云南联合基金重点支持项目 U2002211

详细信息
    作者简介:

    李忠(1982-), 男, 硕士, 高级工程师, 从事地球物理研究工作。E-mail: 278618901@qq.com

    通讯作者:

    吴中海(1974-), 男, 博士, 研究员, 从事新构造和活动构造研究。E-mail: wuzhonghai8848@foxmail.com, wzhh4488@sina.com

  • 中图分类号: P319.3+2

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

Funds: 

the China Geological Survey Project DD20160268

Key Projects of Yunnan United Fund U2002211

  • 摘要: 运用EH4音频大地电磁测深方法,并结合钻探资料成果,对巧家巨型古滑坡的空间结构进行探测分析;有效确定了该滑坡的空间电性和结构特征。研究发现该滑坡的主滑动面平均深度250 m;并发现滑坡体及邻侧存在6条活动断裂(F1—F6),其中小江断裂带(F1)为主要活动断裂。同时,综合分析电磁测深结果与钻探资料推断,在金沙江边台阶从地表的全新统(Qh)到深部依次推断为砂质粘土层—砂砾层—溶蚀(破碎)灰岩层—完整基岩(灰岩)层四层,其中在地表出露为灰岩的地段中,从地表到深部依次推断为溶蚀(破碎)灰岩层和完整灰岩层二层。综合分析认为,目前古滑坡暂时稳定,但是由于小江断裂带北段未来存在较明显的大地震活动背景,该古滑坡是否具有复活可能,区域上是否还会发生类似的巨型古滑坡等关键问题,值得进一步研究。文章的研究结果表明,EH4音频大地电磁法对巨型古滑坡探测是一种比较有效的地球物理方法。

     

  • 图  1  巧家古滑坡区域地质及位置图

    a—巧家古滑坡区域地质图(据张贵等, 2017修改); b—巧家古滑坡位置示意图(据王治华,1996修改)

    Figure  1.  Map showing the regional geology and location of the Qiaojia paleo-landslide.

    (a) Regional geological map of the Qiaojia paleo-landslide (modified after Zhang et al., 2017). (b) Location sketch map of the Qiaojia paleo-landslide (modified after Wang, 1996)

    图  2  视电阻率-频率曲线图

    Figure  2.  Curves of apparent resistivity vs. frequency

    图  3  EH4资料处理流程图

    Figure  3.  Flow sheet of the EH4 data processing

    图  4  10线物探综合解释推断及滑坡形态示意图

    a-剖面位于巨型古滑坡位置简单示意图; b-剖面反演结果及滑坡形态示意图; c-地质及物探推断断面图

    Figure  4.  Comprehensive interpretation of geophysical prospecting of Line 10 and schematic diagram of the landslide shape.

    (a) Location sketch of the section on the gigantic paleo landslide. (b) Diagram showing the section inversion results and landslide shape. (c) Diagram showing the geological- and geophysical- inferred section

    表  1  岩石电性电阻率统计表

    Table  1.   Statistical results of the electrical resistivity of rocks

    岩性 所含地层 数量 ρs/(Ω·m)
    变化范围 平均值
    粘土 Q 30 138~256 147
    砂质粘土 Q 30 55~121 71
    砂砾层 Q 45 392~712 1162
    灰岩 P1y, D2q, S2s 112 840~9743 3686
    石英砂岩 D1ps 12 1429~2582 2030
    玄武岩 Pe 64 116~650 310
    白云岩 D2q, S2s 22 2805~8321 4663
    下载: 导出CSV
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  • 收稿日期:  2020-11-30
  • 修回日期:  2021-01-15
  • 刊出日期:  2021-04-28

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