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2017年8月8日四川九寨沟7.0级地震发震构造浅析

付国超 吕同艳 孙东霞 熊仁伟

付国超, 吕同艳, 孙东霞, 等, 2017. 2017年8月8日四川九寨沟7.0级地震发震构造浅析. 地质力学学报, 23 (6): 799-809.
引用本文: 付国超, 吕同艳, 孙东霞, 等, 2017. 2017年8月8日四川九寨沟7.0级地震发震构造浅析. 地质力学学报, 23 (6): 799-809.
FU Guochao, LÜ Tongyan, SUN Dongxia, et al., 2017. SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN. Journal of Geomechanics, 23 (6): 799-809.
Citation: FU Guochao, LÜ Tongyan, SUN Dongxia, et al., 2017. SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN. Journal of Geomechanics, 23 (6): 799-809.

2017年8月8日四川九寨沟7.0级地震发震构造浅析

基金项目: 

中国地质科学院院基本科研业务费 YYWF201518

中国地质科学院地质力学研究所所基本科研业务费项目 DZLXJK201501

中国地质科学院地质力学研究所所基本科研业务费项目 DZLXJK201714

中国地质调查局地质调查项目 121201104000150009

详细信息
    作者简介:

    付国超(1989-), 男, 硕士, 研究方向为地震地质和活动构造。E-mail:fuguochaofly@sina.com

    通讯作者:

    吕同艳(1980-), 女, 博士, 高级工程师, 研究方向为第四纪地质研究。E-mail:tongyan_2000@163.com

  • 中图分类号: P546;P315.2

SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN

  • 摘要: 2017年8月8日21时19分,四川阿坝州九寨沟县发生7.0级地震,震中位于巴颜喀拉块体东边界虎牙断裂和东昆仑断裂带东段塔藏断裂交汇区域,地震构造背景较为复杂。地震导致了房屋和道路破坏、滑坡崩塌。根据高分辨率卫星影像解译、阶地坎变形的测量和测年数据得到:塔藏断裂东段晚第四纪以来以左旋走滑为主,兼逆分量,水平滑动速率为2.7~4.1 mm/yr,垂直滑动速率为0.56~0.6 mm/yr。结合此次地震的主余震分布、主震震源机制解等综合结果,初步建立了三维发震构造模型,分析认为此次地震属于走滑型地震,主破裂倾角57°~77°,发震断层可能是塔藏断裂的一条分支,是青藏高原块体向东推挤的一次地震事件。基于历史地震、活动断裂和形变观测方面的研究,巴颜喀拉块体具备显著的强震构造背景,对于该块体边界带周缘的强震活动和变形需要继续关注。

     

  • 图  1  研究区断裂及余震分布图

    ATF—阿尔金断裂带;HF—海原断裂带;KTF—昆仑断裂带;LMF—龙门山断裂带;JLF—嘉黎断裂带;RRF—红河断裂带;TZF—塔藏断裂;LRBF—龙日坝断裂;MJF—岷江断裂;BLGF—白龙江断裂;GGS-DSF—光盖山-迭山断裂;HYF—虎牙断裂

    Figure  1.  Distribution map of regional faults and aftershocks in the study area

    图  2  地震精定位及余震分布图(据IGP-CEA)

    Figure  2.  Precise location of the earthquake and distribution map of aftershocks

    图  3  下黄寨遥感解译及断层剖面

    a-高分一号影像三维可视化解译(图中箭头指示断层位置);b-断层剖面;c-断层剖面示意图

    Figure  3.  GF-1 remote sensing image and fault profile of Xiahuangzhai

    图  4  神仙池附近遥感解译及断错地貌

    a-神仙池附近高分一号影像三维可视化;b-断错地貌照片;c-地层褶皱照片

    Figure  4.  GF-1 remote sensing image and fault profile of Shenxianchi area

    图  5  漳扎镇附近遥感解译

    a-漳扎镇一带高分一号三维可视化;b-彭布地貌照片;c-荷叶地貌照片;d-彭布断层剖面

    Figure  5.  GF-1 remote sensing image and landform near Zhangzha Town

    图  6  草坡沟西北断错地貌

    a-Google earth影像;b-山脊位错;c-断层陡坎

    Figure  6.  Dislocation landform in northwestern Caopogou

    图  7  若也得附近冲洪积的断错

    a-Google earth影像;b-高分一号影像;c-地貌位错图;d-T2阶断层陡坎地实测剖面;e-采样剖面洪积扇位错

    Figure  7.  Dislocation of alluvial fan near Ruoyedei area

    图  8  唐寨无人机航拍与DGPS测量

    a-唐寨断错地貌;b-无人机航拍图;c-DGPS实测地形;d-T2阶断层陡坎地实测剖面;e-T3阶地断层陡坎实测剖面;g、f-采样剖面图

    Figure  8.  UAV aerial image and DGPS measurement of Tangzhai

    图  9  发震构造模型示意图

    Figure  9.  Schematic diagram of seismogenic structure model

    表  1  四川九寨沟7.0级地震的震源机制解参数

    Table  1.   Focal mechanism solutions of the Jiuzhaigou Ms7.0 earthquake

    资料来源 断层节面Ⅰ 断层节面Ⅱ 震中 震源深度
    /km
    震级
    走向/° 倾角/° 滑动角/° 走向/° 倾角/° 滑动角/°
    CENC 326 62 15 64 77 151 103.82°E 33.20°N 20 M7.0
    Global-CMT 150 78 13 242 77 150 103.90°E 33.21°N 14.9 Ms6.5
    IGP-CEA 153 84 33 246 57 173 103.85°E 33.19°N 13.5 Mw6.5
    下载: 导出CSV

    表  2  AMS 14C样品测年结果

    Table  2.   The dating reults of AMS14C samples

    样品编号 实验室样品编号 采样深度/m 13C/12C 样品岩性 年龄结果/a BP
    JZG-C-01 440594 1.8 25.4% 碳屑 2450±30
    JZG-C-02 446948 1.2 24.9% 碳屑 5110±30
    JZG-C-03 440593 1.0 26.9% 碳屑 1470±30
    注:样品由美国BETA实验室测试
    下载: 导出CSV
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