气候变化领域集成服务门户(CCPortal): Fine Structure of the Chenghai Fault Zone, Yunnan, China, Constrained From Teleseismic Travel Time and Ambient Noise Tomography

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DOI	10.1029/2020JB019565
	Fine Structure of the Chenghai Fault Zone, Yunnan, China, Constrained From Teleseismic Travel Time and Ambient Noise Tomography
	Yang H.; Duan Y.; Song J.; Jiang X.; Tian X.; Yang W.; Wang W.; Yang J.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	To derive high-resolution fault zone (FZ) structure of the Chenghai fault in Yunnan, southwestern China, we deployed a linear dense array crossing the fault from January to February 2018. The array consisted of 158 short-period (5 s) three-component instruments and spanned an aperture of ~8 km with average station spacing of 40–50 m. During the 1-month deployment, 20 teleseismic earthquakes with moment magnitudes larger than 5.5 and 41 local earthquakes were recorded. We first analyzed the travel times of P and S waves from teleseismic earthquakes to determine the boundaries of the FZ. After correcting the station-event geometry effects, teleseismic travel time differences between the reference station, and all other stations clearly marked a zone of 3.4 km in width with distinct travel time anomaly, suggesting a low-velocity zone (LVZ) surrounding the Chenghai fault. We then conducted ambient noise tomography and found that the S wave velocity of the LVZ was reduced by 60% and 40% compared to the northwest and southeast of the LVZ, respectively. Our ambient noise results suggested the LVZ extending to ~1.5 km in depth, consistent with the travel time anomalies of teleseismic earthquakes. Integrating ambient noise tomography with teleseismic travel times in a dense array with such an aperture is an effective approach for resolving FZ structure and depth extent. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	dense array; fault zone
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/187740
作者单位	Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Shatin, Hong Kong; Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China; Center of Geophysical Exploration, China Earthquake Administration, Zhengzhou, China; Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing, China; West Yunnan Earthquake Forecasting Experiment Site, China Earthquake Administration, Dali, China
推荐引用方式 GB/T 7714	Yang H.,Duan Y.,Song J.,et al. Fine Structure of the Chenghai Fault Zone, Yunnan, China, Constrained From Teleseismic Travel Time and Ambient Noise Tomography[J],2020,125(7).
APA	Yang H..,Duan Y..,Song J..,Jiang X..,Tian X..,...&Yang J..(2020).Fine Structure of the Chenghai Fault Zone, Yunnan, China, Constrained From Teleseismic Travel Time and Ambient Noise Tomography.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Yang H.,et al."Fine Structure of the Chenghai Fault Zone, Yunnan, China, Constrained From Teleseismic Travel Time and Ambient Noise Tomography".Journal of Geophysical Research: Solid Earth 125.7(2020).