戴丹青,杨志高,孙丽. 2023. 2022年1月8日青海门源MS6.9地震破裂过程. 地震学报,45(5):1−9. doi: 10.11939/jass.20220032
引用本文: 戴丹青,杨志高,孙丽. 2023. 2022年1月8日青海门源MS6.9地震破裂过程. 地震学报,45(5):1−9. doi: 10.11939/jass.20220032
Dai D Q,Yang Z G,Sun L. 2023. Rupture process of the MS6.9 Menyuan,Qinghai, earthquake on January 8,2022. Acta Seismologica Sinica45(5):1−9. doi: 10.11939/jass.20220032
Citation: Dai D Q,Yang Z G,Sun L. 2023. Rupture process of the MS6.9 Menyuan,Qinghai, earthquake on January 8,2022. Acta Seismologica Sinica45(5):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

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:破裂为自初始破裂点向南东东方向扩展的单侧破裂,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。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,预示了破裂区复杂的构造,该地区未来仍然有发生强震的可能性。

     

    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 reconstructed in Qinghai during the implementation of the National Rapid Intensity Report and Seismic Early Warning Project. Based on these data, the rupture process of the MS6.9 Qinghai earthquake on January 8, 2022 was inverted by the iterative deconvolution and stacking (IDS) method. The rupture model from inversion shows that the rupture extends from the initial rupture point to a unilateral rupture in the southeast-east 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. This suggests that 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. There is still the possibility of strong earthquakes in this area in the future.

     

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