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首页> 外文期刊>Journal of Asian earth sciences >Electrical structure of the Kunlun-Qinling fault system, northeastern Tibetan Plateau, inferred from 3-D inversion of magnetotelluric data
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Electrical structure of the Kunlun-Qinling fault system, northeastern Tibetan Plateau, inferred from 3-D inversion of magnetotelluric data

机译：昆仑 - 秦岭故障系统的电气结构，东北藏高原，从磁音数据的三维反转推断

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摘要

Located in the northeastern Tibetan Plateau, the East Kunlun fault is a west-east left-lateral strike-slip fault that branches out into a horsetail-shaped structure known as the Kunlun-Qinling Fault system (KQFS) at its eastern terminus. The 2017 Jiuzhaigou Ms 7.0 earthquake occurred in this horsetail-shaped structure. The electrical structures of four profiles that cross different sections of the KQFS and Jiuzhaigou earthquake region are obtained in this study. Our results reveal key differences among these sections. The East Kunlun fault is the only electrical boundary in the Maqu section, whereas the Tazang, Bailongjiang, and Guanggaishan-Dieshan faults in the Tazang section form an imbricate fan structure that extends from south to north and merges into a high conductivity layer (HCL) in the mid-lower crust. Alternating high and low resistivity bodies below the KQFS revealed by the magnetotelluric method (MT) may be related to the cause of slip rate segmentation from the East Kunlun fault into the KQFS. The hypocenter of the 2017 Ms 7.0 Jiuzhaigou earthquake lies between the high and low resistivity bodies at the northeastern, shallowing edge of the HCL. The northern section of the Huya fault corresponds to a deep crustal electrical boundary. The Huya and Tazang faults form a one-sided imbricate fan structure that merges at depth into the HCL. The HCL is deep in the southwestern part of our study area but shallows to the northeast. This observation suggests that northeast movement of the Tibetan Plateau causes tectonic uplift and the frequent occurrence of strong earthquakes in this region.
机译：东昆仑故障位于西藏东北高原，是西方左侧防滑故障，分支成以其东部末端被称为昆仑 - 秦岭故障系统（KQFS）的马尾式结构。 2017年九寨沟MS 7.0地震发生在此马尾式结构中。在本研究中获得了三种曲线的四个曲线的电气结构，在该研究中获得了kqfs和jiuzhaigou地震区的不同部分。我们的结果揭示了这些部分之间的关​​键差异。东昆仑故障是玛士段唯一的电气边界，而塔坦，百龙江和广大山山虎山故障形成了一种夸大的风扇结构，从南到北延伸，合并到高电导率层（HCl）中在中下地壳中。在磁音法（MT）揭示的KQF下方的交替和低电阻率体可能与从东昆仑故障进入KQF的滑移速率分割的原因有关。 2017年7月7.0九寨沟地震的低柔顺者位于东北部的高电阻率体之间，即HCL的边缘。 Huya故障的北部截面对应于深层地壳电气边界。 Huya和Tazang Faults形成了一种单面拆除风扇结构，可在HCL中合并到HCL中。 HCL深入了我们研究区的西南部，但浅滩到东北部。该观察表明，西藏高原的东北运动导致构造隆起和该地区频繁发生的强烈地震发生。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第1期|103910.1-103910.9|共9页
  • 作者

    Sun Xiangyu; Zhan Yan; Zhao Lingqiang; Chen Xiaobin; Sun Jianbao; Li Chenxi; Cui Tengfa; Han Jing;

  • 作者单位

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China|China Earthquake Adm Second Monitoring & Applicat Ctr Xian 710043 Shaanxi Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

    Shaanxi Seismol Bur Xian 710068 Shaanxi Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

    China Earthquake Adm State Key Lab Earthquake Dynam Inst Geol Beijing 100029 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Kunlun-Qinling fault system; Magnetotellurics; 3-D inversion; 2017 Jiuzhaigou earthquake; Songpan-Ganzi terrane;

    机译：Kunlun-Q in令fault system;magneto telluric是;3-D inversion;2017 J IU宅购earthquake;song盘-Gan字terrane;

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