气候变化领域集成服务门户(CCPortal): Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography

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DOI	10.1029/2020JB021036
	Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography
	Chen S.; Zhao J.; Xu Q.; Liu H.; Ju C.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The seismogenic structure of the 2017 Ms 7.0 Jiuzhaigou earthquake is still under debate. To address this issue, we use arrival times of P- and S- waves from 1766 local earthquakes recorded by our deployed 18 temporary seismic stations to perform the local earthquake tomography and present the 3-D distributions of the P- wave and S- wave velocities (Vp and Vs), Vp/Vs ratio and the locations of the relocated aftershocks in the source region of the 2017 Jiuzhaigou earthquake. The aftershocks occurred at depths of 2–10 km, and can be divided into a NNW-SSE trending northern segment and a NW-SE trending southern segment relative to hypocenter of the main shock. Combined with previous observations, it is proposed that the Jiuzhaigou earthquake occurred on an unmapped fault which is a branch of the easternmost segment of the eastern Kunlun fault zone. The source region of the Jiuzhaigou earthquake is characterized by high Vp and low Vs anomalies as well as high Vp/Vs ratios, suggesting the presence of fluids in the fractured rocks. These fluids may have contributed to the occurrence of the Jiuzhaigou earthquake by reducing the effective normal stress and thus causing the brittle failure of rocks. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	fluids; Jiuzhaigou earthquake; seismic tomography; seismogenic fault; Velocity anomaly; Vp/Vs ratio
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187235
作者单位	Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Chen S.,Zhao J.,Xu Q.,et al. Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography[J],2021,126(4).
APA	Chen S.,Zhao J.,Xu Q.,Liu H.,&Ju C..(2021).Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Chen S.,et al."Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography".Journal of Geophysical Research: Solid Earth 126.4(2021).