Source Parameters and Seismogenic Fault Model of the 2024 Mw 7.0 Wushi (Xinjiang, China) Earthquake Revealed by InSAR Observations

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-07-08 DOI:10.1007/s00024-024-03531-y
Shuyuan Yu, Zhejun Li, Peng Zhao, Jiaji Luo, Yuanyuan Yang
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Abstract

On January 23, 2024, an Mw 7.0 earthquake struck Wushi County, Xinjiang. This study used Sentinel-1A data to obtain the co-seismic deformation field utilising the InSAR technique in the Wushi area. An earthquake uniform slip model was determined using a Bayesian algorithm. The earthquake fault slip distribution was inverted using the steepest descent method (SDM), and the seismic impact on neighbouring faults was evaluated using the Coulomb instability criteria. The maximum displacement was approximately 76 cm in line of sight (LOS) direction as observed using ascending Interferometric Synthetic Aperture Radar (InSAR) data. The fault is responsible for earthquake trends towards the northwest, with a dip angle of approximately 62.8°, strike of approximately 229°, and slip angle of approximately 49.8°, and it displays a compressive and sinistral strike-slip motion. The fault parameters and spatial position were aligned with the Maidan Fault at the southern margin of the Tianshan Mountains. Coulomb stress analysis revealed that regions such as the Kuokesale Fault Zone, the Dashixia Fault Zone, the Tuoshengan Fault (northwest of the epicentre), the Piqiang North Fault Zone, and the Wensu North Fault Zone situated in the southeast of the epicentre experienced stress accumulation and warranted attention. The co-seismic deformation field of the two strong aftershocks indicates a southeast-trending reverse fault located in the middle of the basin. This fault, influenced by the continuous compressive movement of the Maidan Fault, predominantly exhibited reverse movement during an earthquake. The seismic activity in the Wushi earthquake sequence indicates crustal shortening in the southern Tianshan region facilitated by the absorption of compression from the frontal compressional thrust belt and high-angle reverse faults in the orogenic belt.

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InSAR 观测揭示的 2024 年中国新疆乌什 7.0 级地震震源参数和发震断层模型
2024 年 1 月 23 日,新疆乌什县发生 7.0 级地震。本研究利用 Sentinel-1A 数据,利用 InSAR 技术获得了巫溪地区的共震变形场。利用贝叶斯算法确定了地震均匀滑移模型。利用最陡下降法(SDM)反演了地震断层滑移分布,并利用库仑不稳定性准则评估了地震对邻近断层的影响。利用上升干涉合成孔径雷达(InSAR)数据观测到的视线(LOS)方向最大位移约为 76 厘米。该断层的地震走向为西北向,倾角约为 62.8°,走向约为 229°,滑动角约为 49.8°,呈压缩性正弦走向滑动运动。该断层的参数和空间位置与天山南缘的麦积山断层一致。库仑应力分析表明,位于震中东南部的阔克萨勒断裂带、大石峡断裂带、土生安断裂(震中西北部)、皮强北断裂带和温宿北断裂带等区域出现应力堆积,值得关注。两次强烈余震的共震变形场表明,盆地中部有一条东南走向的逆断层。该断层受梅丹断层持续压缩运动的影响,在地震中主要表现为逆向运动。巫溪地震序列中的地震活动表明,天山南北地区的地壳缩短是由于吸收了正面压缩推力带和造山带高角度逆断层的压缩作用。
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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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