基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度

魏星, 王向腾, 李志伟, 王烁帆, 黄志斌, 刘杰. 2019. 基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度. 地球物理学报, 62(4): 1300-1311, doi: 10.6038/cjg2019L0796
引用本文: 魏星, 王向腾, 李志伟, 王烁帆, 黄志斌, 刘杰. 2019. 基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度. 地球物理学报, 62(4): 1300-1311, doi: 10.6038/cjg2019L0796
WEI Xing, WANG XiangTeng, LI ZhiWei, WANG ShuoFan, HUANG ZhiBin, LIU Jie. 2019. Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location. Chinese Journal of Geophysics (in Chinese), 62(4): 1300-1311, doi: 10.6038/cjg2019L0796
Citation: WEI Xing, WANG XiangTeng, LI ZhiWei, WANG ShuoFan, HUANG ZhiBin, LIU Jie. 2019. Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location. Chinese Journal of Geophysics (in Chinese), 62(4): 1300-1311, doi: 10.6038/cjg2019L0796

基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度

  • 基金项目:

    国家自然科学基金(41774069)资助

详细信息
    作者简介:

    魏星, 男, 1981年生, 中国科学技术大学地球与空间科学学院在读博士生, 中国地震台网中心高级工程师, 主要从事地震监测与震源参数研究.E-mail:weixing@seis.ac.cn

    通讯作者: 王向腾, 男, 1989年生, 东华理工大学地球物理与测控技术学院讲师, 主要从事地震定位与震源参数研究.E-mail:wangxt@whigg.ac.cn
  • 中图分类号: P315

Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location

More Information
  • 本文利用Pn/Pg相对定位方法,测定了2017年8月8日四川九寨沟M7.0主震及部分余震的起始破裂深度.地震的起始破裂深度是理解地震孕震机理的重要参数,而九寨沟地区台网稀疏,地壳速度结构复杂,基于传统的到时定位方法测定地震起始破裂深度误差较大.Pn/Pg相对定位方法首先基于流动观测近台记录对2017年8月10日M4.1和11月7日M4.5余震震源位置进行测定,选择其为参考事件,再利用Pg校正主震水平位置,Pn约束震源起始深度,基于参考事件可以有效降低速度模型对震源位置测定的影响.结果显示:九寨沟主震起始破裂深度约9 km,早期余震的震源深度分布在7~13 km,主要集中在主震起始破裂深度附近.

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  • 图 1 

    Pn/Pg相对走时定位方法原理图

    Figure 1. 

    Schematic of Pn/Pg relative location method

    图 2 

    地震事件以及台站分布

    Figure 2. 

    Distributions of earthquakes and seismic stations

    图 3 

    M4.1参考事件Pn和Pg台站选择分布图

    Figure 3. 

    Distribution of seismic stations for Pg and Pn of M4.1 event

    图 4 

    主震以及M4.1与M4.5参考事件Pg与Pn震相

    Figure 4. 

    The onsets of Pg and Pn for the main shock, M4.1 and M4.5 reference events

    图 5 

    Pn(红色)和Pg(黑色)相对走时差分布

    Figure 5. 

    Distribution of Pn (red) and Pg (black) relative difference traveltimes

    图 6 

    主震起始深度与残差分布

    Figure 6. 

    Distribution of initial rupture depth of main shock and relative traveltime residuals

    图 7 

    Pn(红色)和Pg(黑色)相对走时差分布

    Figure 7. 

    Distribution of Pn (red) and Pg (black) relative difference traveltimes

    图 8 

    九寨沟M7.0地震及其较大余震分布

    Figure 8. 

    Distribution of the M7.0 Jiuzhaigou main shock and major aftershocks

    表 1 

    2017年8月10日M4.1地震定位结果

    Table 1. 

    Hypocenter locations of 10 August 2017 M4.1 earthquake

    发震时刻 经度(°) 纬度(°) 深度(km) 残差(s) 水平误差(km) 垂直误差(km) 模型
    2017-08-10 17:48:34.750 103.8062 33.1975 10.96 0.03 0.63 1.14 易桂喜
    2017-08-10 17:48:34.960 103.8050 33.2025 9.89 0.07 0.67 1.37 Crust2.0
    2017-08-10 17:48:34.750 103.8053 33.1977 10.94 0.03 0.63 1.15 Crust1.0
    下载: 导出CSV

    表 2 

    2017年11月7日M4.5地震定位结果

    Table 2. 

    Hypocenter locations of 7 November 2017 M4.5 earthquake

    发震时刻 经度(°) 纬度(°) 深度(km) 残差(s) 水平误差(km) 垂直误差(km) 模型
    2017-11-07 05:31:08.460 103.7570 33.2245 11.57 0.11 1.10 1.27 易桂喜
    2017-11-07 05:31:08.820 103.7687 33.2250 9.13 0.09 1.14 1.46 Crust2.0
    2017-11-07 05:31:08.450 103.7560 33.2248 11.61 0.12 1.11 1.26 Crust1.0
    下载: 导出CSV

    表 3 

    2017年8月9—10日7个较大余震重新定位结果

    Table 3. 

    Hypocenter relocations of 7 major aftershocks of August 9 and 10, 2017

    发震时刻 经度(°) 纬度(°) 深度(km)
    (CENC1)
    深度(km)
    (易桂喜2)
    深度(km)
    本文1
    震级
    MW
    2017-08-08 21:19:47.10 103.810 33.200 20 5 9 6.5
    2017-08-09 05:37:14.80 103.856 33.125 23 7 9 4.3
    2017-08-09 08:29:04.30 103.782 33.296 18 10 10 4.4
    2017-08-09 09:22:15.10 103.831 33.175 21 12 13 4.2
    2017-08-09 09:32:48.20 103.725 33.272 16 11 10 4.3
    2017-08-09 10:17:03.20 103.830 33.160 5 8 10 M4.8
    2017-08-10 03:02:13.50 103.770 33.249 22 3 7 4.1
    2017-08-10 05:05:55.00 103.818 33.177 20 10 11 M4.3
    2017-08-10 17:48:34.750 103.806 33.198 20 10 10.96 M4.1*
    2017-11-06 21:31:08.460 103.7570 33.225 16 - 11.57 M4.5*
    注:1地震起始深度,2质心深度,*本文两个余震参考事件.
    下载: 导出CSV
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收稿日期:  2018-01-09
修回日期:  2018-09-27
上线日期:  2019-04-05

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