2022年青海门源MS6.9地震余震演化与地震触发

doi:10.12196/j.issn.1000-3274.2023.01.002

摘要/Abstract

摘要： 地震序列的时空演化有助于揭示地震成核过程和地震相互作用。本文采用双差定位方法对2009年以来门源地区的目录地震重新定位, 并以其为模板, 匹配扫描连续波形, 完善2022年门源 M_S6.9地震前后的活动图像。结果表明: 2022年门源M_S6.9地震主要发生在托勒山北断裂南侧高角度南倾的走滑断裂上, 无明显前震活动, 是典型的主—余型序列; 早期余震向主震东西两侧扩展, 迁移距离与流逝时间呈对数关系, 符合震后余滑扩散特征, 并且西侧的迁移速率和地震强度高于东侧; 冷龙岭断裂和门源地震发震断裂斜交, 但它的地震活动与余震不同, 这些活动在余震扩散前锋到达前开始, 沿断层向东南方向迁移但很快受阻, 直到5 d后M_S5.2地震发生后才继续南迁, 最后终止于2016年门源M_S6.4地震余震扩散区的尾端附近。因此, 两条断层上的地震时空演化反映了断层之间的相互作用, 冷龙岭断裂的地震活动受2022年门源主震库仑应力变化影响而触发。

关键词: 2022年门源M_S6.9地震, 微震检测, 地震重定位, 余震迁移, 地震触发

Abstract: The earthquake sequence’s spatial-temporal evolution can help to reveal the earthquake nucleation process and the interaction between earthquakes. In this paper, we relocated earthquakes in the catalog since 2009 around the 2022 Menyuan M_S6.9 focal area with the HypoDD and used them as templates to match-filter re-scan continuous waveforms, building a more complete seismic activity map before and after the mainshock. The results show there was not obvious foreshock pefore the 2022 Menyuan mainshock and it was a typical mainshock-aftershock sequence. Most of aftershocks mainly occurred in a strike-slip fault on the south side of Tuoleshan-north fault, dipping to the south at a high angle. The early aftershocks expanded along strike to the east and west with a logarithm migration relationship between distance and the elapsed time, meeting the rule of the afterslip expansion. The Lenglongling fault oblique intersects with the mainshock’s fault, and its seismicity is different from the aftershocks. The events in the Lenglongling fault occurred before the aftershock expansion front and migrated southeastward along the strike, but soon blocked. The migration continued again only after the M_S5.2 earthquake occurred 5 days later, and finally stopped near the end of the 2016 Menyuan aftershock zone. Therefore, the spatial-temporal evolution pattern of the earthquakes indicates the two faults interaction and the seismicity in the Lenglongling fault is probably triggered by the Coulomb stress change from the 2022 Menyuan mainshock.

Key words: The 2022 Menyuan M_S6.9 earthquake, Microseismic detection, Earthquake relocation, Aftershock migration, Earthquake triggering

中图分类号:

P315.7

闫坤, 王伟君, 寇华东, 叶志鹏. 2022年青海门源M_S6.9地震余震演化与地震触发[J]. 地震, 2023, 43(1): 15-32.

YAN Kun, WANG Wei-jun, KOU Hua-dong, YE Zhi-peng. The Aftershock Evolution and Earthquake Triggering of the 2022 Menyuan M_S6.9 Earthquake[J]. EARTHQUAKE, 2023, 43(1): 15-32.

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