2022年1月8日青海门源MS6.9地震破裂过程

戴丹青 杨志高 孙丽

戴丹青,杨志高,孙丽. 2022. 2022年1月8日青海门源MS6.9地震破裂过程. 地震学报,44(0):1−9 doi: 10.11939/jass.20220032
引用本文: 戴丹青,杨志高,孙丽. 2022. 2022年1月8日青海门源MS6.9地震破裂过程. 地震学报,44(0):1−9 doi: 10.11939/jass.20220032
Dai D Q,Yang Z G,Sun L. 2022. Rupture process of the MS6.9 Menyuan,Qinghai, earthquake on January 8, 2022. Acta Seismologica Sinica,44(0):1−9 doi: 10.11939/jass.20220032
Citation: Dai D Q,Yang Z G,Sun L. 2022. Rupture process of the MS6.9 Menyuan,Qinghai, earthquake on January 8, 2022. Acta Seismologica Sinica44(0):1−9 doi: 10.11939/jass.20220032

2022年1月8日青海门源MS6.9地震破裂过程

doi: 10.11939/jass.20220032
基金项目: 国家重点研发计划(2021YFC3000701-03)资助
详细信息
    作者简介:

    戴丹青,博士,工程师,主要从事地震预警和震源破裂过程方面的研究,e-mail:daidanqing@seis.ac.cn

    通讯作者:

    杨志高,博士,高工,主要从事数字地震学方面的研究,e-mail:yzg@seis.ac.cn

  • 中图分类号: 315.31

Rupture process of the MS6.9 Menyuan,Qinghai, earthquake on January 8, 2022

  • 摘要: 基于近台强震波形数据可快速且稳定地反演地震破裂过程。利用国家烈度速报与预警项目实施过程中青海地区新建和改建的强震动观测台站的波形数据,基于迭代反褶积和叠加法(IDS)对2022年1月8日青海MS6.9地震的震源破裂过程进行了反演。反演结果显示:破裂自初始破裂点向南东东方向扩展的单侧破裂,持续时间约14 s (主要集中在2—8 s),最大滑动量为3.6 m,破裂长度约为20 km。这表明破裂在纵向上自深部向浅部扩展,这与现场调查的地表破裂吻合。余震序列空间分布展示出显著的分段特征,预示破裂区复杂的构造,该地区未来仍然有发生强震的可能性。

     

  • 图  1  2022门源MS6.9地震周边强震台站的分布

    三角形标示强震台位置,最终参与反演的强震台站以紫色三角标示

    Figure  1.  Distribution of strong motion stations near 2022 Menyuan MS6.9 earthquake

    图  2  2022门源MS6.9地震的理论波形与观测波形对比

    黑线表示各个强震台的三分量观测波形,自上而下分别是东西(EW)、南北(NS)和垂直(UD)分量的波形,台站名称标示在垂东西向波形数图的左上。红线表示基于破裂过程的理论地震图,观测地震图和理论地震图的拟合度标示在各分量波形图左下。

    Figure  2.  Comparison of theoretical and observed waveforms of the 2022 Menyuan MS6.9 earthquake

    The black lines represent the three-component observation waveform observed by strong motion station. Each panel represents the east-west, north-south,and vertical components from top to bottom, respectively,and the station code is marked on the upper left of the east-west component waveform. The red line represents the theoretical seismogram based on the inverted rupture process,and the cross correlation between the observed and the theoretical waveform is marked in the lower left of echo component

    图  3  2022门源MS6.9地震断层面静态滑移分布(圆圈表示主震位置)

    Figure  3.  Static slip distribution on the fault plane of the 2022 MS6.0 Menyuan earthquake (The solid white circle indicates the epicenter of the main shock)

    图  4  2022门源MS6.9地震震源时间函数

    Figure  4.  Source time function of the 2022 MS6.0 Menyuan earthquake

    图  5  2022门源MS6.9地震时空破裂过程

    (a) 滑动速率时空分布;(b) 累积滑动量时空分布

    Figure  5.  The spatiotemporal rupture process of the 2022 Menyuan MS6.9 earthquake

    (a)Distribution of slip rate;(b) Distribution of cumulative slip

    图  6  2022门源MS6.0地震静态滑移分布与震源时间函数(引自USGS,2022

    Figure  6.  Static slip distribution and source time function of the 2022 MS6.0 Menyuan earthquake (after USGS,2022

    图  7  2022门源MS6.9地震序列(主震以白色圆圈表示,余震以黑色圆圈表示)与2016年门源MS6.4地震序列(紫色圆圈)空间分布对比

    Figure  7.  Spatial distribution comparison between the 2022 MS6.9 Menyuan earthquake sequence (the white circle stands for mainshock and the black circle indicates aftershock) and the 2016 MS6.4 Menyuan earthquake sequence (purple circles)

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出版历程
  • 收稿日期:  2022-03-16
  • 修回日期:  2022-07-25
  • 网络出版日期:  2022-10-18

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