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地质力学学报:2021,27(2):317-325
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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
(1.云南省地质调查院, 云南 昆明 650216;2.自然资源部三江成矿作用及资源勘查利用重点实验室, 云南 昆明 650051;3.中国地质科学院地质力学研究所, 北京 100081;4.自然资源部地质灾害防治技术指导中心, 北京 100081)
Using EH4 audio-magnetotelluric sounder to detect the gigantic Qiaojia paleo-landslide and its structural characteristics
(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)
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投稿时间:2020-11-30    修订日期:2021-01-15
中文摘要: 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。
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.
文章编号:     中图分类号:P319.3+2    文献标志码:
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)
引用文本:
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[J].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[J].Journal of Geomechanics,27(2):317-325.DOI:10.12090/j.issn.1006-6616.2021.27.02.029

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