Probing the Fault Complexity of the 2017 Ms 7.0 Jiuzhaigou Earthquake Based on the InSAR Data

Probing the Fault Complexity of the 2017 Ms 7.0 Jiuzhaigou Earthquake Based on the InSAR Data
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基于InSAR数据探讨2017年九寨沟7.0级地震断层复杂性

DOI:
10.3390/rs13081573
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发表时间:
2021-04
期刊:
影响因子:
5
通讯作者:
Zhou Jiangcun
Zhou Jiangcun
中科院分区:
工程技术2区
文献类型:
--
作者:
Tang Xiongwei;Guo Rumeng;Xu Jianqiao;Sun Heping;Chen Xiaodong;Zhou Jiangcun

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2017年8月8日,一场面波震级为7.0级的地震发生在延伸至虎牙断层以北的隐伏断层上。基于干涉合成孔径雷达(干涉合成孔径雷达)数据获得的同震形变场和一系列有限断层模型试验,提出了一种全新的由一条主断层和一条次级断层组成的两断层模型作为九寨沟地震的最佳模型,其中次级断层与主断层面的北方端成一个大钝角。结果表明,位错分布以左旋位错为主,存在明显的浅部位错亏损。主断层由两个由余震间隙限定的凹凸体组成,余震间隙可能代表一个障碍。此外,大多数余震位于应力阴影区,并与同震高滑区出现互补模式。我们认为,余震是由于背景构造应力,这可能与速度加强区。
On 8 August 2017, a surface wave magnitude (Ms) 7.0 earthquake occurred at the buried faults extending to the north of the Huya fault. Based on the coseismic deformation field obtained from interferometric synthetic aperture radar (InSAR) data and a series of finite fault model tests, we propose a brand-new two-fault model composed of a main fault and a secondary fault as the optimal model for the Jiuzhaigou earthquake, in which the secondary fault is at a wide obtuse angle to the northern end of the main fault plane. Results show that the dislocation distribution is dominated by sinistral slip, with a significant shallow slip deficit. The main fault consists of two asperities bounded by an aftershock gap, which may represent a barrier. In addition, most aftershocks are located in stress shadows and appear a complementary pattern with the coseismic high-slip regions. We propose that the aftershocks are attributable to the background tectonic stress, which may be related to the velocity-strengthening zones.
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