The 2021 Mw7.4 Maduo earthquake: Coseismic slip model, triggering effect of historical earthquakes and implications for adjacent fault rupture potential

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Xianwen Liu , Qiang Chen , Yinghui Yang , Qian Xu , Jingjing Zhao , Lang Xu , Rong Liu
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引用次数: 5

Abstract

On 22 May 2021 (CST), an Mw7.4 earthquake struck Maduo County, Qinghai Province, China, which was the largest seismic event in China since the 2008 Mw7.9 Wenchuan earthquake. Several scientific questions associated with the event could be addressed: (1) what fault slip model can explain the Maduo earthquake? (2) what effects do historical earthquakes impose on the Maduo earthquake? and (3) what implications does the Maduo earthquake have for future rupture potential of adjacent tectonic faults? So we conduct a comprehensive study to answer the three questions by collecting satellite SAR images, GPS data, seismic waveform data, historical earthquakes, and aftershocks associated with the Maduo earthquake. The estimated fault slip model shows that the Maduo earthquake ruptures two faults in a manner of dominant sinistral strike-slip motion, with slip peaks of ~4.8 m occurring near the surface. The minor fault to the east dips to the south accommodating an obvious reverse slip, well consistent with reverse fault scarps, reverse faulting aftershocks, and significant upward surface displacements immediately south of this branch. Such a reverse slip is probably controlled by the motion of nearby major sinistral strike-slip faults (the Eastern Kunlun fault and the Maduo–Gande fault). Among 32 historical Mw≥ 6.0 earthquakes used in this study, we find that the 1937 Mw7.8 Huashixia earthquake may affect the Maduo earthquake most, delaying its occurrence by decreasing the Coulomb failure stress (CFS) at the hypocenter by > 1 bar and on the entire causative fault by an average of 0.68 bar. Besides, the Mw6.1 Yangbi earthquake, which occurred ~4.5 h ahead of the Maduo earthquake, appears to make little influence on the Maduo earthquake because it hardly perturbates the CFS at the hypocenter of the Maduo earthquake. Furthermore, the cumulative CFS change due to both the 32 historical earthquakes and the 2021 Maduo event indicates that the Tuosuo Lake–Maqu segment of the Eastern Kunlun fault may be at high risk of future rupture.

2021年Mw7.4级麻多地震:同震滑动模型、历史地震触发效应及其对相邻断层破裂潜力的影响
2021年5月22日(CST),中国青海省麻多县发生里氏7.4级地震,这是自2008年汶川里氏7.9级地震以来中国最大的地震事件。与该事件相关的几个科学问题可以得到解决:(1)什么样的断层滑动模型可以解释玛多地震?(2)历史地震对麻多地震有何影响?(3)玛多地震对相邻构造断裂未来的破裂潜力有何启示?因此,我们通过收集卫星SAR图像、GPS数据、地震波形数据、历史地震数据以及与麻多地震相关的余震数据,对这三个问题进行了综合研究。断层滑动模型估计表明,玛多地震以左旋走滑运动为主的方式使两条断层破裂,地表附近出现了约4.8 m的滑动峰。东部的小断层向南倾斜,容纳明显的逆滑,与逆断层陡坡、逆断层余震以及该分支以南明显的向上地表位移相吻合。这种逆滑可能受附近左旋大走滑断裂(东昆仑断裂和麻多-甘德断裂)的运动控制。在本研究使用的32次历史Mw≥6.0级地震中,1937年Mw7.8级花石峡地震对麻多地震影响最大,通过降低震源库仑破坏应力(CFS),延缓了麻多地震的发生;1巴,在整个致病断层上平均减少0.68巴。此外,发生在玛多地震前约4.5 h的Mw6.1级杨壁地震对玛多地震的影响不大,因为它几乎没有扰动玛多震源的CFS。此外,32次历史地震和2021年玛多事件造成的累积CFS变化表明,东昆仑断裂带陀所湖-玛曲段可能处于未来破裂的高风险中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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