气候变化领域集成服务门户(CCPortal): Macrofracturing of Oceanic Lithosphere in Complex Large Earthquake Sequences

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DOI	10.1029/2020JB020137
	Macrofracturing of Oceanic Lithosphere in Complex Large Earthquake Sequences
	Lay T.; Ye L.; Wu Z.; Kanamori H.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Major earthquakes in oceanic lithosphere seaward of the subduction zone outer trench slope are relatively uncommon, but several recent occurrences have involved very complex sequences rupturing multiple nonaligned faults and/or having high aftershock productivity with diffuse distribution. This includes the 21 December 2010 MW 7.4 Ogasawara (Bonin), 11 April 2012 MW 8.6 Indo-Australia, 23 January 2018 MW 7.9 Off-Kodiak Island, and 20 December 2018 MW 7.3 Nikol'skoye (northwest Pacific) earthquakes. Major oceanic intraplate event sequences farther from plate boundaries do not tend to be as complex in faulting or aftershocks. Outer trench slope extensional faulting can involve complex distributed sequences, particularly when activated by great megathrust ruptures such as 11 March 2011 MW 9.1 Tohoku and 15 November 2006 MW 8.3 Kuril Islands. Intense faulting sequences also occur near subduction zone corners, with many fault geometries being activated, including some in nearby oceanic lithosphere, as for the 29 September 2009 MW 8.1 Samoa, 6 February 2013 MW 8.0 Santa Cruz Islands, and 16 November 2000 MW 8.0 New Ireland earthquakes. The laterally varying plate boundary stresses from heterogeneous locking, recent earthquakes, or boundary geometry influence the specific faulting geometries activated in nearby major intraplate ruptures in oceanic lithosphere. Preexisting lithospheric structures and fabrics exert secondary influences on the faulting. Intraplate stress release in oceanic lithosphere near subduction zones favors distributed macrofracturing of near-critical fault systems rather than localized, single-fault failures, both under transient loading induced by plate boundary ruptures and under slow loading by tectonic motions and slab pull. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	complex earthquakes; earthquake productivity; oceanic intraplate earthquakes; outer rise faulting; plate stresses
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187560
作者单位	Earth and Planetary Sciences Department, University of California, Santa Cruz, CA, United States; Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, China; College of Geophysics, Chengdu University of Technology, Chengdu, China; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Lay T.,Ye L.,Wu Z.,et al. Macrofracturing of Oceanic Lithosphere in Complex Large Earthquake Sequences[J],2020,125(10).
APA	Lay T.,Ye L.,Wu Z.,&Kanamori H..(2020).Macrofracturing of Oceanic Lithosphere in Complex Large Earthquake Sequences.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Lay T.,et al."Macrofracturing of Oceanic Lithosphere in Complex Large Earthquake Sequences".Journal of Geophysical Research: Solid Earth 125.10(2020).