气候变化领域集成服务门户(CCPortal): Preliminary Analysis of Source Physics Experiment Explosion-Triggered Microseismicity Using the Back-Projection Method

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DOI	10.1029/2020JB021312
	Preliminary Analysis of Source Physics Experiment Explosion-Triggered Microseismicity Using the Back-Projection Method
	Ichinose G.A.; Ford S.R.; Kroll K.; Dodge D.; Pyle M.; Pitarka A.; Walter W.R.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	A series of four chemical explosions were detonated in a deep borehole within the Yucca Flat Dry Alluvium Geology (DAG) at the Nevada National Security Site between 2018 and 2019. The two larger chemical explosions of 50 tons (DAG-2) and 10 tons (DAG-4) TNT equivalent yield triggered energetic aftershock sequences numbering 1392 and 347 microearthquakes, respectively, within the first 10 days. No significant aftershock activity was observed for the two smaller 1-ton explosions (DAG-1 and DAG-3). We used a back-projection method based on travel-time migration and stacking of signal-to-noise ratio traces to detect, associate and locate aftershocks from a subset of 22-geophones within a larger 2 (Formula presented.) 2 km seismic array surrounding the borehole. The aftershocks located within 300 m of the borehole and the depths were above the working points of 300 and 50 m depths of DAG-2 and DAG-4, respectively, ruling out triggering slip on geologic faults or disturbances beneath neighboring collapse craters. DAG-2 and DAG-4 aftershocks decayed at similar rates, with power-law exponents of p = 1.48 and p = 1.49, respectively. These decay rates are comparable to aftershocks sequences triggered by earthquakes and historical nuclear explosions at Yucca Flat. A smooth power-law aftershock decay within the first 10 days suggests a triggering mechanism from explosion generated stress relaxation due to the diffusion of high gas pressures in the cavity and radial fractures. A more random and episodic aftershock rate would be expected due to cavity collapse or falling rubble in chimney formation. Published 2021. This article is a U.S. Government work and is in the public domain in the USA.
英文关键词	aftershock decay rates; aftershocks; back-projection; explosion-triggered microseismicity; source physics experiment; travel-time stacking
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/187159
作者单位	Lawrence Livermore National Laboratory, Livermore, CA, United States
推荐引用方式 GB/T 7714	Ichinose G.A.,Ford S.R.,Kroll K.,et al. Preliminary Analysis of Source Physics Experiment Explosion-Triggered Microseismicity Using the Back-Projection Method[J],2021,126(5).
APA	Ichinose G.A..,Ford S.R..,Kroll K..,Dodge D..,Pyle M..,...&Walter W.R..(2021).Preliminary Analysis of Source Physics Experiment Explosion-Triggered Microseismicity Using the Back-Projection Method.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Ichinose G.A.,et al."Preliminary Analysis of Source Physics Experiment Explosion-Triggered Microseismicity Using the Back-Projection Method".Journal of Geophysical Research: Solid Earth 126.5(2021).