气候变化领域集成服务门户(CCPortal): High-Precision Relocation With the Burial Depths of the North Korean Underground Nuclear Explosions by Combining Pn and Pg Differential Traveltimes

CCPortal

DOI	10.1029/2020JB020745
	High-Precision Relocation With the Burial Depths of the North Korean Underground Nuclear Explosions by Combining Pn and Pg Differential Traveltimes
	Yang G.; Zhao L.F.; Xie X.B.; Zhang L.; Yao Z.X.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	In seismic nuclear monitoring, an accurate source depth is an important prerequisite for reliably estimating the explosive yield. Relative location methods are often used for this purpose. However, the conventional method based on regional Pn waves usually fails to give satisfactory constraints on the source depth, mainly due to the strong trade-off between the burial depth and origin time. This study explores a high-precision relative location method to simultaneously determine the relative epicenter and source elevation by using differential traveltimes from both downward-takeoff Pn waves and horizontal-takeoff Pg waves. The properties of both Pg and Pn waves, including the consistency between waveforms, the reliability of differential traveltime measurements, and their sensitivities to epicenter and depth variations, are investigated. By jointly applying both types of waveform data, the proposed method significantly enhances the constraint on the source depth variation. This method is applied to regional seismic data collected from China, South Korea, and Japan to determine the relative epicenters, origin times and relative burial depths of six North Korean underground nuclear explosions. The source depths are then used to provide burial-depth corrections to estimate the explosive yields. The depths of the six North Korean nuclear explosions detonated on October 2006, May 2009, February 2013, January 2016, September 2016, and September 2017 are determined to be 330, 540, 506, 468, 521, and 570 m, respectively, and their yields after burial depth corrections are 1.6, 5.7, 13.4, 12.6, 21.7, and 225.7 kt, respectively. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	burial depth; differential traveltimes; explosion yield estimation; high-precision 3-D relocation; multiple phases; The North Korean Nuclear Test
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/187064
作者单位	Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Mohe Observatory of Geophysics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Institute of Geophysics and Planetary Physics, University of California at Santa Cruz, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Yang G.,Zhao L.F.,Xie X.B.,et al. High-Precision Relocation With the Burial Depths of the North Korean Underground Nuclear Explosions by Combining Pn and Pg Differential Traveltimes[J],2021,126(6).
APA	Yang G.,Zhao L.F.,Xie X.B.,Zhang L.,&Yao Z.X..(2021).High-Precision Relocation With the Burial Depths of the North Korean Underground Nuclear Explosions by Combining Pn and Pg Differential Traveltimes.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Yang G.,et al."High-Precision Relocation With the Burial Depths of the North Korean Underground Nuclear Explosions by Combining Pn and Pg Differential Traveltimes".Journal of Geophysical Research: Solid Earth 126.6(2021).