气候变化领域集成服务门户(CCPortal): Rupture of the 2020 MW 7.8 Earthquake in the Shumagin Gap Inferred From Seismic and Geodetic Observations

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DOI	10.1029/2020GL090806
	Rupture of the 2020 MW 7.8 Earthquake in the Shumagin Gap Inferred From Seismic and Geodetic Observations
	Liu C.; Lay T.; Xiong X.; Wen Y.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	The eastern portion of the Shumagin gap along the Alaska Peninsula ruptured in an MW 7.8 thrust earthquake on 22 July 2020. The megathrust fault space-time slip history is determined by joint inversion of regional and teleseismic waveform data along with co-seismic static Global Navigation Satellite System (GNSS) displacements. The rupture expanded westward and along-dip from the hypocenter, located adjacent to the 1938 MW 8.2 Alaska earthquake, with slip and aftershocks extending into the gap about 180 to 205 km, respectively, at depths from 15 to 40 km. The deeper half of ~75% of the Shumagin gap experienced faulting. However, the patchy slip is significantly less than possible accumulated slip since the region's last major rupture in 1917, compatible with geodetic seismic-coupling estimates of 10-40% beneath the Shumagin Islands. The rupture terminated in the western region of very low seismic coupling. There was a regional decade-scale decrease in b-value prior to the 2020 event. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Faulting; Geodesy; Global positioning system; Alaska earthquakes; Fault space; Geodetic observation; Global Navigation Satellite Systems; Joint inversion; Seismic coupling; Teleseismic waveforms; Western region; Earthquakes; aftershock; displacement; earthquake event; earthquake rupture; faulting; geodetic network; GNSS; observational method; spatiotemporal analysis; Alaska; Alaska Peninsula; Shumagin Islands; United States
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/169469
作者单位	Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, China; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States; School of Geodesy and Geomatics, Wuhan University, Wuhan, China
推荐引用方式 GB/T 7714	Liu C.,Lay T.,Xiong X.,et al. Rupture of the 2020 MW 7.8 Earthquake in the Shumagin Gap Inferred From Seismic and Geodetic Observations[J],2020,47(22).
APA	Liu C.,Lay T.,Xiong X.,&Wen Y..(2020).Rupture of the 2020 MW 7.8 Earthquake in the Shumagin Gap Inferred From Seismic and Geodetic Observations.Geophysical Research Letters,47(22).
MLA	Liu C.,et al."Rupture of the 2020 MW 7.8 Earthquake in the Shumagin Gap Inferred From Seismic and Geodetic Observations".Geophysical Research Letters 47.22(2020).