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, Shuze; Zhao, Junmeng; Xu, Qiang; Liu, Hongbing; Ju, Changhui
通讯作者	Xu, Q (通讯作者)
发表日期	2021
ISSN	2169-9313
EISSN	2169-9356
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.
关键词	LONGMENSHAN FAULT ZONE SEISMOGENIC STRUCTURE COSEISMIC DEFORMATION M(S)7.0 EARTHQUAKE VELOCITY STRUCTURE SEISMIC STRUCTURE TIBETAN PLATEAU FOCAL MECHANISM POISSONS RATIO BENEATH
英文关键词	seismic tomography; seismogenic fault; Jiuzhaigou earthquake; Velocity anomaly; Vp; Vs ratio; fluids
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000644658600075
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260174
推荐引用方式 GB/T 7714	Chen, Shuze,Zhao, Junmeng,Xu, Qiang,et al. Evidence for Fluids at the Hypocenter of the 2017 Ms 7.0 Jiuzhaigou Earthquake Revealed by Local Earthquake Tomography[J]. 中国科学院青藏高原研究所,2021,126(4).
APA	Chen, Shuze,Zhao, Junmeng,Xu, Qiang,Liu, Hongbing,&Ju, Changhui.(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, Shuze,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).