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潍坊青州ML4.1地震震源区发震构造分析

柴光斌 张辉 崔华伟 李翠芹 赵银刚 池国民 刘海林 李世莹

柴光斌,张辉,崔华伟,李翠芹,赵银刚,池国民,刘海林,李世莹,2024. 潍坊青州ML4.1地震震源区发震构造分析. 震灾防御技术,19(1):61−67. doi:10.11899/zzfy20240106. doi: 10.11899/zzfy20240106
引用本文: 柴光斌,张辉,崔华伟,李翠芹,赵银刚,池国民,刘海林,李世莹,2024. 潍坊青州ML4.1地震震源区发震构造分析. 震灾防御技术,19(1):61−67. doi:10.11899/zzfy20240106. doi: 10.11899/zzfy20240106
Chai Guangbin, Zhang Hui, Cui Huawei, Li Cuiqin, Zhao Yingang, Chi Guomin, Liu Hailin, Li Shiying. The Analysis of Seismogenic Structure of Seismic Source Area of Qingzhou ML4.1 Earthquake in Shandong[J]. Technology for Earthquake Disaster Prevention, 2024, 19(1): 61-67. doi: 10.11899/zzfy20240106
Citation: Chai Guangbin, Zhang Hui, Cui Huawei, Li Cuiqin, Zhao Yingang, Chi Guomin, Liu Hailin, Li Shiying. The Analysis of Seismogenic Structure of Seismic Source Area of Qingzhou ML4.1 Earthquake in Shandong[J]. Technology for Earthquake Disaster Prevention, 2024, 19(1): 61-67. doi: 10.11899/zzfy20240106

潍坊青州ML4.1地震震源区发震构造分析

doi: 10.11899/zzfy20240106
基金项目: 中国地震局地震预测开放基金(XH22024D);河北省地震动力学重点实验室开放基金(FZ202205);中国地震局震情跟踪定向工作(2022010119);山东省地震局一般科研项目(YB2319)
详细信息
    作者简介:

    柴光斌,男,生于1996 年。助理工程师。主要从事地震活动性方面的研究。Email:915882737@qq.com

    通讯作者:

    张辉,男,生于1985年。工程师。主要从事地震活动性方面的研究。Email:1064883633@qq.com

The Analysis of Seismogenic Structure of Seismic Source Area of Qingzhou ML4.1 Earthquake in Shandong

  • 摘要: 2022年5月2日7时53分山东潍坊青州发生ML4.1地震,基于中国地震台网中心的地震观测报告和山东数字化台网的波形资料,采用双差定位法对潍坊青州地震序列进行重新精定位,利用 P波初动方法对其中11个ML2.0以上的地震求震源机制解。利用阻尼时空应力反演方法和MSATSI软件包反演震源区局部应力场特征。经过分析得到以下结论:青州地震序列往SN向展布、倾向N。主震震源机制显示为正断,其节面Ⅰ走向263°、倾角31°、滑动角−109°,节面Ⅱ走向106°、倾角61°、滑动角−78°,局部应力场最佳主压应力轴呈NWW-SEE向(−92.19°)低倾角(16.09°)挤压,最优主张应力轴呈SSE-NNW向(0.26°)近水平(8.45°)拉张。本文推断发震断层为走向EW的隐伏断裂。
  • 图  1  青州地震震中构造

    Figure  1.  Tectonic background of Qingzhou earthquake swarm

    图  2  青州地震震中及震源机制解分布图

    Figure  2.  The distribution of epicenter and focal mechanism solutions of Qingzhou earthquake sequence

    图  3  地震断层特征分布三元图

    Figure  3.  A ternary diagram representing the distribution of earthquake faulting characteristics

    图  4  双差重定位地震分布图

    Figure  4.  The location distribution of earthquakes after double-difference relocation

    图  5  青州地震震源区R值和局部应力场投影

    Figure  5.  R-values and regional stress fields in the source area of the Qingzhou earthquake

    表  1  青州地震震群震源机制解

    Table  1.   The focal mechanism solutions of Qingzhou earthquake swarm

    序号发震时刻经度/(°)纬度/(°)深度/km震级ML节面Ⅰ
    str/dip/rake
    节面Ⅱ
    str/dip/rake
    Paz/PplTaz/TplBaz/BplMDBP波初动地震类型
    12022-05-01
    T07:23:57
    118.26836.5505.02.1150/90/9015/0/135240/4560/45150/00.2119R
    22022-05-01
    T07:32:34
    118.26836.5404.62.9320/0/050/90/ -90320/45140/4550/00.1926N
    32022-05-01
    T08:01:00
    118.27036.5455.02.427/75/-132280/44/-22256/44147/1940/400.1718N-SS
    42022-05-02
    T07:53:27
    118.26636.5305.04.1263/31/-109106/61/-7843/72187/15280/100.1330N
    52022-05-02
    T20:31:51
    118.26736.5425.03.4100/90/90325/0/135190/4510/45100/00.1822R
    62022-05-02
    T20:36:35
    118.26536.5453.93.0100/90/90325/0/135190/4510/45100/00.1224R
    72022-05-03
    T00:41:23
    118.26536.5355.12.4206/53/115348/44/60278/5176/69100/200.2524R
    82022-05-03
    T19:58:37
    118.26436.5415.02.5182/44/120324/53/6572/5174/69340/200.1822R
    92022-05-03
    T20:50:23
    118.26636.5415.02.4191/36/126329/ 62/6775/14198/ 65340/200.1820R-SS
    102022-05-12
    T18:14:36
    118.26636.5524.92.7300/70/-90120/20/-90210/6530/25120/00.2015N
    112022-05-13
    T22:13:16
    118.27036.5514.02.3123/31/-109326/61/ -78263/7247/15140/100.1916N
    注:str、dip、rake分别是震源机制的走向、倾角、滑动角;Paz/Ppl 、Taz/Tpl 、 Baz/Bpl分别代表P轴、T轴、 B轴的方位角和倾伏角;MDB表示矛盾比。
    下载: 导出CSV

    表  2  青州地震序列震源机制解反演使用的一维速度模型

    Table  2.   The 1-D velocity model used for focal mechanisms inversion of Qingzhou earthquake sequence

    参数序号
    123456789101112
    顶层深度/km0.01.05.07.010.112.015.018.020.023.025.032.0
    P波速度/(km·s-12.253.805.105.205.405.605.806.006.206.507.208.13
    下载: 导出CSV

    表  3  青州地震震源区应力场

    Table  3.   The stress field in seismic area of Qingzhou earthquake

    R值最优主压应力轴(σ1中间应力轴(σ2最优主张应力轴(σ3
    方位角/°倾伏角/°方位角/°倾伏角/°方位角/°倾伏角/°
    最优解0.51−92.1916.09116.9971.720.268.45
    下载: 导出CSV
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  • 刊出日期:  2024-03-31

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