气候变化领域集成服务门户(CCPortal): Forming a Mogi Doughnut in the Years Prior to and Immediately Before the 2014 M8.1 Iquique; Northern Chile; Earthquake

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DOI	10.1029/2020GL088351
	Forming a Mogi Doughnut in the Years Prior to and Immediately Before the 2014 M8.1 Iquique; Northern Chile; Earthquake
	Schurr B.; Moreno M.; Tréhu A.M.; Bedford J.; Kummerow J.; Li S.; Oncken O.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	Asperities are patches where the fault surfaces stick until they break in earthquakes. Locating asperities and understanding their causes in subduction zones is challenging because they are generally located offshore. We use seismicity, interseismic and coseismic slip, and the residual gravity field to map the asperity responsible for the 2014 M8.1 Iquique, Chile, earthquake. For several years prior to the mainshock, seismicity occurred exclusively downdip of the asperity. Two weeks before the mainshock, a series of foreshocks first broke the upper plate then the updip rim of the asperity. This seismicity formed a ring around the slip patch (asperity) that later ruptured in the mainshock. The asperity correlated both with high interseismic locking and a circular gravity low, suggesting that it is controlled by geologic structure. Most features of the spatiotemporal seismicity pattern can be explained by a mechanical model in which a single asperity is stressed by relative plate motion. ©2020. The Authors.
英文关键词	Offshore oil well production; Plates (structural components); Coseismic slips; Fault surfaces; Geologic structures; Mechanical model; Residual gravity; Seismicity pattern; Single asperity; Subduction zones; Earthquakes; asperity; earthquake event; foreshock; gravity field; gravity flow; plate motion; seismicity; slip rate; subduction zone; Chile; Iquique; Tarapaca
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/169868
作者单位	Deutsches GeoForschungsZentrum-GFZ, Section Lithosphere Dynamics, Potsdam, Germany; Departamento de Geofísica, Universidad de Concepción, Concepción, Chile; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany; Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Schurr B.,Moreno M.,Tréhu A.M.,et al. Forming a Mogi Doughnut in the Years Prior to and Immediately Before the 2014 M8.1 Iquique; Northern Chile; Earthquake[J],2020,47(16).
APA	Schurr B..,Moreno M..,Tréhu A.M..,Bedford J..,Kummerow J..,...&Oncken O..(2020).Forming a Mogi Doughnut in the Years Prior to and Immediately Before the 2014 M8.1 Iquique; Northern Chile; Earthquake.Geophysical Research Letters,47(16).
MLA	Schurr B.,et al."Forming a Mogi Doughnut in the Years Prior to and Immediately Before the 2014 M8.1 Iquique; Northern Chile; Earthquake".Geophysical Research Letters 47.16(2020).