区域宽频地震波形反演所揭示的2022年1月青海门源MS6.9地震震源破裂过程

朱音杰 罗艳 赵里

朱音杰,罗艳,赵里. 2023. 区域宽频地震波形反演所揭示的2022年1月青海门源MS6.9地震震源破裂过程. 地震学报,45(3):1−15 doi: 10.11939/jass.20220148
引用本文: 朱音杰,罗艳,赵里. 2023. 区域宽频地震波形反演所揭示的2022年1月青海门源MS6.9地震震源破裂过程. 地震学报,45(3):1−15 doi: 10.11939/jass.20220148
Zhu Y J,Luo Y,Zhao L. 2023. Rupture process of the January 2022 Menyuan,Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms. Acta Seismologica Sinica,45(3):1−15 doi: 10.11939/jass.20220148
Citation: Zhu Y J,Luo Y,Zhao L. 2023. Rupture process of the January 2022 Menyuan,Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms. Acta Seismologica Sinica45(3):1−15 doi: 10.11939/jass.20220148

区域宽频地震波形反演所揭示的2022年1月青海门源MS6.9地震震源破裂过程

doi: 10.11939/jass.20220148
基金项目: 自然科学基金面上项目 (41974063)、地震科学联合基金(U1939202)和河北省地震科技星火计划攻关项目(DZ202108090110)联合资助
详细信息
    作者简介:

    朱音杰,工程师,主要从事震源参数方面的研究,e-mail: zhuyinj@mail.ustc.edu.cn

    通讯作者:

    罗艳,博士,研究员,主要从事震源参数及区域构造应力场方面的研究,e-mail:luoyan.wind@ gmail.com ·

  • 中图分类号: 315.2

Rupture process of the January 2022 Menyuan,Qinghai MS6.9 earthquake revealed by inversion of regional broadband seismograms

  • 摘要: 基于有限断层模型反演方法,利用区域宽频带数据反演了2022年1月青海门源MS6.9地震的震源破裂过程,并结合地质构造与地震重定位结果判断发震断层走向。综合反演结果表明:此次地震的发震断层走向为NWW向,主要以走滑为主;破裂主要发生在震源两侧,可能存在着双侧破裂,在震后2 s、9 s出现破裂极大值,最大错动量约为1.5 m,位于深度约6 km处,发生明显破裂的深度约为16 km,地表破裂长度约20 km;此次地震释放的标量地震矩为1.23×1019 N·m,相当于矩震级MW6.7。地震能量主要在前15 s释放;发震断层面的倾角为84.6°,接近于垂直,由于破裂范围较大,所以发生明显错动分布的地表投影也长达34 km。

     

  • 图  1  青藏高原东北缘构造背景和历史地震活动

    (a) 青藏高原东北缘2010—2022年ML3.0地震分布及MS≥5.0地震的震源机制解,图中红色六角星为两次MS≥6.0地震的震中位置;沙滩球为MS≥5.0地震的震源机制解;红线为断裂带;(b) 2022年1月门源MS6.9地震的震中及周边MS≥5.0地震的震源机制解,F1:肃南—祁连断裂,F2:托莱山断裂;F3:冷龙岭断裂;(c) 研究区位置及块体运动方向示意图,图中红色箭头指示地块运动方向,黑色方框为研究区

    Figure  1.  Tectonic settings,historical earthquakes and focal mechanisms of MS≥5.0 earthquakes in the northeastern margin of Tibetan Plateau

    (a) Distribution of ML3.0 earthquakes and focal mechanisms of MS≥5.0 earthquakes in the northeastern margin of Tibetan Plateau from January 2010 to January 2022, where red stars are epicenters of two MS≥6.0 earthquakes,beach balls show focal mechanisms of the earthquakes of MS≥5.0;(b) Epicenter of the January 2022 Menyuan MS6.9 earthquake and focal mechanisms of MS≥5.0 earthquakes in the surrounding region,F1:Sunan-Qilian fault;F2:Tuolaishan fault;F3:Lenglongling fault; (c) Location of study area and the schematic illustration of block motion directions,where red arrows indicate the directions of block movements,and the black box shows the study area

    图  4  台站(蓝色三角形)分布图(a)和以节面Ⅰ为断层面的反演破裂过程的波形拟合(b)

    黑色与红色波形分别为观测与理论波形;波形左侧大写字母E,N,Z分别表示东西、南北、垂直三个分量,波形上方数字为最大振幅

    Figure  4.  Station distribution (blue triangles)(a) and waveform fitness when using nodal plane Ⅰ as the fault plane in slip distribution inversion (b)

    Black and red traces are observed and synthetic waveforms,respectively. Capital letters on the left stand for the east-west,north-south and vertical components. The number above each trace indicates the maximum amplitude of the data

    图  2  本研究中用来反演震源机制解及破裂过程的地壳分层速度模型

    Figure  2.  Layered crustal velocity model used in the inversions of focal mechanism and rupture process in this study

    图  3  2022年1月门源MS6.9地震(图a中星形所示)的余震分布

    (a) 地表投影;(b) 在AB剖面上的投影;(c) 在CD剖面上的投影

    Figure  3.  Distribution of the aftershocks of the January 2022 Menyuan MS6.9 earthquake

    (a) Projection of aftershocks on the surface;(b) Projection of aftershocks on the cross section AB; (c) Projection of aftershocks on the cross section CD

    图  5  以震源机制解中节面Ⅰ为断层面反演得到的震源破裂过程

    (a) 错动在断层面上的分布黑色箭头表示破裂错动方向,黑色等值线为破裂开始时间,蓝色五角星为震源位置;(b) 地震矩释放率函数

    Figure  5.  Slip distribution obtained by using nodal plane I in the focal mechanism solution as the fault plane

    (a) Slip distribution on the fault plane; black arrows represent both the amount (length) and direction of slip;blue star shows the hypocentral location;(b) Seismic moment release rate as a function of time

    图  6  门源主震三维模型下地震错动分布

    Figure  6.  The fault slip distribution in the 3D model of Menyuan earthquake

    图  7  门源主震震源错动分布在地表的投影

    投影中颜色代表错动量大小,蓝色五角星为震中位置,灰色圆圈为余震分布

    Figure  7.  Surface projection of the fault slip distribution of Menyuan earthquake

    In the projection,the color indicates the amount of slip;the blue star is the epicentral location;the gray circles are the aftershocks

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  • 收稿日期:  2022-08-16
  • 修回日期:  2022-09-28
  • 网络出版日期:  2022-09-30

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