Rupture process of the MS6.9 Menyuan，Qinghai， earthquake on January 8，2022
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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。利用国家地震烈度速报与预警工程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日青海门源MS6.9地震的震源破裂过程进行了反演。反演结果显示：破裂为自初始破裂点向ESE向扩展的单侧破裂，持续时间约为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。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，预示了破裂区复杂的构造。
Abstract:Based on the waveform data observed by the near field strong-motion stations, the earthquake rupture process can be quickly and stably inverted. This paper collected waveform data recorded by the strong-motion stations constructed recently and reconstructed in Qinghai during the implementation of the National Seismic Intensity Rapid Report and Early Warning Project. Based on these data, we performed the inversion for the rupture process of the MS6.9 Menyuan, Qinghai, earthquake on January 8, 2022 by the iterative deconvolution and stacking （IDS） method. The rupture model from inversion shows that the rupture extends from the initial rupture point towards the ESE direction, with a duration of about 14 seconds （mainly focus on 2−8 seconds）, a maximum slip of 3.6 m, and a rupture length of about 20 km. The rupture extends longitudinally from the deep to the shallow, which is consistent with the surface rupture found in the field investigation. The spatial distribution of aftershock sequences shows significant segmentation characteristics, indicating complex tectonic transitions in the rupture zone.
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Keywords:
- 2022 Menyuan earthquake /
- source rupture process /
- strong motion data /
- IDS method
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图 1 2022门源MS6.9地震周边强震台站分布
紫色三角形表示最终参与反演的强震台站
Figure 1. Distribution of strong motion stations near 2022 Menyuan MS6.9 earthquake
Purple triangles are the strong motion stations used for inversion
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图 2 2022年门源MS6.9地震的理论波形与观测波形对比
台站名称标示在波形图的左上；黑线表示各个强震台的三分量观测波形，自上而下分别是EW，NS和UD分量的波形，红线表示基于破裂过程的理论地震图，观测地震图与理论地震图的拟合度标示在各分量波形左下
Figure 2. Comparison of theoretical and observed waveforms of the 2022 Menyuan MS6.9 earthquake
Station codes are marked on the upper left of waveforms. 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。The red lines represent the theoretical seismograms based on the inverted rupture process，and the cross correlation between the observed and the theoretical waveform is marked on the lower left of each waveform
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图 3 2022年门源MS6.9地震断层面静态滑动分布（星形表示主震位置）
Figure 3. Static slip distribution on the fault plane of the MS6.9 Menyuan earthquake in 2022 （The red star indicates the epicenter of the main shock）
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图 4 2022年门源MS6.9地震震源时间函数
Figure 4. Source time function of the MS6.9 Menyuan earthquake in 2022
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图 5 2022年门源MS6.9地震时空破裂过程
（a） 滑动速率分布；（b） 累积滑动量分布
Figure 5. The spatio-temporal rupture process of the 2022 Menyuan MS6.9 earthquakee
（a） Distribution of slip rate；（b） Distribution of cumulative slip
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图 7 2022年门源MS6.9地震序列（主震以白色星形表示，余震以黑色圆点表示）与2016年门源MS6.4地震序列（主震以紫色星形表示，余震以紫色圆点表示）空间分布对比
Figure 7. Spatial distribution comparison between the 2022 MS6.9 Menyuan earthquake sequence （the white star stands for mainshock and the black dots indicate aftershocks） and the 2016 MS6.4 Menyuan earthquake sequence （the purple star stands for mainshock and the purple dots indicate aftershocks）
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