2022 年门源 6.7 级地震揭示了天柱地震带西段的高应力聚集现象

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-08-01 DOI:10.1007/s00024-024-03544-7
Wei Chen, Wei Xiong, Bin Zhao, Yangmao Wen, Xuejun Qiao
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引用次数: 0

摘要

2022 年 1 月 8 日门源地震(Mw6.7)发生在青藏高原东北部的主要边界断裂带上。在这项研究中,我们利用哨兵一号数据,通过像素偏移跟踪(POT)和干涉合成孔径雷达(InSAR)得出了共震形变。干涉图模式显示,同震形变以水平运动为主,轨道和像素偏移跟踪结果中的最大位移均超过 0.5 米。然后,我们根据有限位错模型反演了致震断层的几何参数和断层面的滑移分布。此外,共震滑动主要集中在冷龙岭断层,其主坡面面积为 10 × 23 km,深度为 4 km,最大滑动量为 3.25 ± 0.34 m。根据历史上土拉山断层地震引起的 dCFS 结果和土拉山断层的大地测量滑移率,我们强调西天竺缺口潜在的地震风险较高。
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The 2022 Mw 6.7 Menyuan Earthquake Revealing High Stress Accumulation in the Western Section of the Tianzhu Seismic Gap

The January 8th 2022 Menyuan earthquake(Mw6.7) occurred along major boundary fault zone in the north-eastern Tibetan Plateau. In this study, we derived the co-seismic deformation from pixel offset tracking (POT) and interferometric synthetic aperture radar (InSAR) by using Sentinel-1 data. The interferograms pattern shows that coseismic deformation is dominated by horizontal movements with the maximum displacement are over 0.5 m in both tracks and POT results. Then we inverted the geometry parameters of the causative fault and the slip distribution of the fault plane based on the finite dislocation model. The result shows the seismogenic fault has an average strike of 103.0 and a northeast dip angle of 84. moreover, the coseismic slip is primarily concentrated on the Lenglongling fault with on main asperity of 10 × 23 km and the maximum slip of 3.25 ± 0.34 m at depth of 4 km as well as rupture the eastern of the Tuolaishan fault with a small area of 5 × 5 km at depths of 0–8 km. On the basis of the dCFS results caused by historical earthquakes in Tuolaishan fault and geodetic-derived slip rate of the Tuolaishan fault, we emphasize the potential seismic risk on western Tianzhu gap is high.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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