2008年汶川地震同震-震后应力演化及其对2017年九寨沟MS 7.0地震的影响

黄禄渊, 程惠红, 张怀, 高锐, 石耀霖. 2019. 2008年汶川地震同震-震后应力演化及其对2017年九寨沟MS 7.0地震的影响. 地球物理学报, 62(4): 1268-1281, doi: 10.6038/cjg2019L0545
引用本文: 黄禄渊, 程惠红, 张怀, 高锐, 石耀霖. 2019. 2008年汶川地震同震-震后应力演化及其对2017年九寨沟MS 7.0地震的影响. 地球物理学报, 62(4): 1268-1281, doi: 10.6038/cjg2019L0545
HUANG LuYuan, CHENG HuiHong, ZHANG Huai, GAO Rui, SHI YaoLin. 2019. Coseismic and postseismic stress evolution caused by the 2008 Wenchuan earthquake and its effects on the 2017 MS 7.0 Jiuzhaigou earthquake. Chinese Journal of Geophysics (in Chinese), 62(4): 1268-1281, doi: 10.6038/cjg2019L0545
Citation: HUANG LuYuan, CHENG HuiHong, ZHANG Huai, GAO Rui, SHI YaoLin. 2019. Coseismic and postseismic stress evolution caused by the 2008 Wenchuan earthquake and its effects on the 2017 MS 7.0 Jiuzhaigou earthquake. Chinese Journal of Geophysics (in Chinese), 62(4): 1268-1281, doi: 10.6038/cjg2019L0545

2008年汶川地震同震-震后应力演化及其对2017年九寨沟MS 7.0地震的影响

  • 基金项目:

    国家自然基金重大项目(41590865)、国家自然基金青年基金(41704097)、国家自然基金青年基金(41604077)、中国大陆综合地球物理场观测仪器研发专项(Y201706)和中央级科研院所基本科研业务专项项目(ZDJ2017-12)联合资助

详细信息
    作者简介:

    黄禄渊, 男, 助理研究员, 主要从事地球动力学研究.E-mail:Pekinghly@163.com

    通讯作者: 程惠红, 女, 副教授, 主要从事地球动力学和水库地震触发研究.E-mail:chenghuihong@163.com
  • 中图分类号: P315

Coseismic and postseismic stress evolution caused by the 2008 Wenchuan earthquake and its effects on the 2017 MS 7.0 Jiuzhaigou earthquake

More Information
  • 2017年8月8日四川九寨沟发生了MS 7.0地震,距离汶川地震震中约为140km.地震的发生会调整区域应力分布和影响区域地震活动性变化.那么,汶川地震的发生对此次九寨沟地震有何影响?区域应力如何演化?为回答这些问题,本研究基于高性能并行有限元方法和网格自适应加密技术,采用含地形起伏的黏弹非均匀椭球型地球模型,分别计算了汶川地震引起的同震-震后应力时空动态演化及其对此次九寨沟地震的影响.同时,考虑同震静态应力和震后黏弹性应力调整,计算了汶川、芦山和九寨沟地震的发生对周边断层应力积累的影响.计算结果显示汶川地震对九寨沟发震断层的同震库仑应力加载约为0.008 MPa,震后9年的黏弹性应力加载约为0.012~0.016 MPa,可能会使九寨沟地震提前发生.此外,汶川、芦山和九寨沟地震的发生引起龙门山断裂映秀以南段、东昆仑断裂、龙日坝断裂东段和岷江断裂北段及鲜水河断裂康定段应力加载大于0.01 MPa,增加了这些断裂带发生地震的危险性.

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  • 图 1 

    研究区域地质构造及地表GPS位移场

    Figure 1. 

    Regional geological settings and GPS velocity field

    图 2 

    全球计算模型网格与非均质弹性模量显示(地形夸张30倍)

    Figure 2. 

    Computational grid and heterogeneous elastic parameters(The topography is vertically exaggerated by 30 times to highlight the elevation)

    图 3 

    汶川地震同震位移观测值和计算值

    Figure 3. 

    Observed and modeled coseismic displacements caused by Wenchuan earthquake

    图 4 

    汶川地震引起的断层面同震库仑应力变化

    Figure 4. 

    Coseismic Coulomb stress changes on faults caused by Wenchuan earthquake

    图 5 

    汶川地震震后九年位移观测值与计算值

    Figure 5. 

    Observed and modeled displacements 9 years after the 2008 Wenchuan earthquake

    图 6 

    汶川地震震后在芦山地震(a)和九寨沟地震(b)处库仑应力、剪应力和正应力随时间变化

    Figure 6. 

    Temporal change of ΔCFS at the hypocenters of the 2013 Lushan earthquake (a) and 2017 Jiuzhaigou earthquake (b)

    图 7 

    九寨沟地震引起的同震库仑应力变化与余震(M≥1)分布

    Figure 7. 

    The ΔCFS induced by the Jiuzhaigou earthquake and spatial distribution of aftershocks (M≥1)

    图 8 

    汶川地震、芦山地震和九寨沟地震引起的周围断层库仑应力变化

    Figure 8. 

    ΔCFS on faults caused by Wenchuan, Lushan and Jiuzhaigou earthquakes

    表 1 

    断层几何参数

    Table 1. 

    Geometric parameters of faults

    编号 断层名称 走向/(°) 倾角/(°) 滑动角/(°)
    1 东昆仑断裂 108 70 15
    2 西秦岭断裂东段 93 60 15
    3 秦岭南缘东段 265 75 80
    4 秦岭南缘西段 272 75 80
    5 岷江断裂 357 75 45
    6 龙日坝断裂 50 90 180
    7 鲜水河断裂 326 90 0
    8 小江河断裂 36 75 0
    9 安宁河断裂 1 90 45
    10 大凉山断裂 349 75 0
    11 马边—盐津断裂 91 90 0
    12 龙门山断裂北段 265 90 180
    13 龙门山断裂南段 241 43 90
    14 雅安断裂 34 55 87
    15 九寨沟地震断裂 151 83 -13
    16 虎牙断裂 150 75 0
    下载: 导出CSV

    表 2 

    流变参数

    Table 2. 

    Parameters of visco-elasticcrust and upper mantle

    川西高原 四川盆地
    深度/km η/(Pa·s) 深度/km η/(Pa·s)
    上地壳 0~22 / 0~17 /
    中地壳 22~42 4×1018 17~37 1×1021
    下地壳 42~62 2×1018 37~50 8×1020
    地幔 >62 1×1020 >50 1×1020
    下载: 导出CSV
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出版历程
收稿日期:  2017-09-01
修回日期:  2018-12-18
上线日期:  2019-04-05

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