气候变化领域集成服务门户(CCPortal): Stress Drop Variation of Deep-Focus Earthquakes Based on Empirical Green's Functions

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DOI	10.1029/2019GL086055
	Stress Drop Variation of Deep-Focus Earthquakes Based on Empirical Green's Functions
	Liu M.; Huang Y.; Ritsema J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:9
英文摘要	We analyze source characteristics of global, deep-focus (>350 km) earthquakes with moment magnitudes (Mw) larger than 6.0–8.2 using teleseismic P-wave and S-wave spectra and an empirical Green's functions approach. We estimate the corner frequency assuming Brune's source model and calculate stress drops assuming a circular crack model. Based on P-wave and S-wave spectra, the one standard deviation ranges are 3.5–369.8 and 8.2–328.9 MPa, respectively. Based on the P-wave analysis, the median of our stress drop estimates is about a factor of 10 higher than the median stress drop of shallow earthquakes with the same magnitude estimated by Allmann and Shearer (2009, https://doi.org/10.1029/2008JB005821). This suggests that, on average, the shear stress of deep faults in the mantle transition zone is an order of magnitude higher than the shear stress of faults in the crust. The wide range of stress drops implies coexistence of multiple physical mechanisms. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Drops; Faulting; Seismic waves; Shear stress; Shear waves; Deep-focus earthquakes; Empirical green's functions; Mantle transition zone; Moment magnitudes; Physical mechanism; Shallow earthquakes; Source characteristics; Standard deviation; Earthquakes; earthquake magnitude; empirical analysis; estimation method; mantle structure; P-wave; S-wave; shear stress; teleseismic wave; transition zone
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170425
作者单位	Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States
推荐引用方式 GB/T 7714	Liu M.,Huang Y.,Ritsema J.. Stress Drop Variation of Deep-Focus Earthquakes Based on Empirical Green's Functions[J],2020,47(9).
APA	Liu M.,Huang Y.,&Ritsema J..(2020).Stress Drop Variation of Deep-Focus Earthquakes Based on Empirical Green's Functions.Geophysical Research Letters,47(9).
MLA	Liu M.,et al."Stress Drop Variation of Deep-Focus Earthquakes Based on Empirical Green's Functions".Geophysical Research Letters 47.9(2020).