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DOI	10.1029/2020GL090308
	Slipping the Shumagin Gap: A Kinematic Coseismic and Early Afterslip Model of the Mw 7.8 Simeonof Island; Alaska; Earthquake
	Crowell B.W.; Melgar D.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	In July 2020, a Mw 7.8 earthquake initiated directly to the east of Simeonof Island offshore of the Alaska Peninsula. The earthquake ruptured the eastern part of the Shumagin Gap, a region devoid of large earthquakes over the last century and characterized by low geodetic coupling. Here, we investigate the rupture kinematics of the earthquake using a joint inversion of high-rate GNSS and strong-motion data. We find that the rupture was focused between depths of 30–45 km, starting east of the Shumagin Islands and rupturing downdip towards the northwest, with little slip west of 160°W. Early postseismic observations indicate that the entirety of the Shumagin Gap at depths between 40–60 km ruptured with aseismic afterslip and aftershocks. Historically, this earthquake resembles the Shumagin Islands earthquake of 1917, indicating that a possible rupture asperity exists to explain low interseismic coupling and repeating ~M7.5–8 earthquakes. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earthquake effects; Offshore oil well production; High rate; Joint inversion; Large earthquakes; Shumagin; Strong motion datum; Kinematics; aftershock; asperity; coseismic process; earthquake rupture; geodetic network; GNSS; kinematics; slip rate; Alaska; Shumagin Islands; Simeonof Island; 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/169623
作者单位	Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Department of Earth Sciences, 100 Cascade Hall, University of Oregon, Eugene, OR, United States
推荐引用方式 GB/T 7714	Crowell B.W.,Melgar D.. Slipping the Shumagin Gap: A Kinematic Coseismic and Early Afterslip Model of the Mw 7.8 Simeonof Island; Alaska; Earthquake[J],2020,47(19).
APA	Crowell B.W.,&Melgar D..(2020).Slipping the Shumagin Gap: A Kinematic Coseismic and Early Afterslip Model of the Mw 7.8 Simeonof Island; Alaska; Earthquake.Geophysical Research Letters,47(19).
MLA	Crowell B.W.,et al."Slipping the Shumagin Gap: A Kinematic Coseismic and Early Afterslip Model of the Mw 7.8 Simeonof Island; Alaska; Earthquake".Geophysical Research Letters 47.19(2020).