气候变化领域集成服务门户(CCPortal): Seismic Analysis of the 2020 Magna; Utah; Earthquake Sequence: Evidence for a Listric Wasatch Fault

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DOI	10.1029/2020GL089798
	Seismic Analysis of the 2020 Magna; Utah; Earthquake Sequence: Evidence for a Listric Wasatch Fault
	Pang G.; Koper K.D.; Mesimeri M.; Pankow K.L.; Baker B.; Farrell J.; Holt J.; Hale J.M.; Roberson P.; Burlacu R.; Pechmann J.C.; Whidden K.; Holt M.M.; Allam A.; DuRoss C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	The 18 March 2020 Mw 5.7 Magna earthquake near Salt Lake City, Utah, offers a rare glimpse into the subsurface geometry of the Wasatch fault system—one of the world's longest active normal faults and a major source of seismic hazard in northern Utah. We analyze the Magna earthquake sequence and resolve oblique-normal slip on a shallow (30–35°) west-dipping fault at ~9- to 12-km depth. Combined with near-surface geological observations of steep dip (~70°), our results support a curved, or listric, fault shape. High-precision aftershock locations show the activation of multiple, low-angle (<30–35°) structures, indicating the existence of a complicated fault system. Our observations constrain the deep structure of the Wasatch fault system and suggest that ground shaking in the Salt Lake City region in future Wasatch fault earthquakes may be higher than previously estimated. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earthquakes; Lakes; Active normal faults; Aftershock location; Deep structure; Earthquake sequences; Ground-shaking; Seismic analysis; Seismic hazards; Sub-surface geometries; Fault slips; aftershock; dip-slip fault; earthquake magnitude; fault; normal fault; seismic hazard; seismic stratigraphy; seismicity; slip; Salt Lake City; United States; Utah
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/169744
作者单位	Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States; Geologic Hazards Science Center, U.S. Geological Survey, Golden, CO, United States
推荐引用方式 GB/T 7714	Pang G.,Koper K.D.,Mesimeri M.,et al. Seismic Analysis of the 2020 Magna; Utah; Earthquake Sequence: Evidence for a Listric Wasatch Fault[J],2020,47(18).
APA	Pang G..,Koper K.D..,Mesimeri M..,Pankow K.L..,Baker B..,...&DuRoss C..(2020).Seismic Analysis of the 2020 Magna; Utah; Earthquake Sequence: Evidence for a Listric Wasatch Fault.Geophysical Research Letters,47(18).
MLA	Pang G.,et al."Seismic Analysis of the 2020 Magna; Utah; Earthquake Sequence: Evidence for a Listric Wasatch Fault".Geophysical Research Letters 47.18(2020).