气候变化领域集成服务门户(CCPortal): Large Coseismic Slip to the Trench during the 2011 Tohoku-Oki Earthquake

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DOI	10.1146/annurev-earth-071719-055216
	Large Coseismic Slip to the Trench during the 2011 Tohoku-Oki Earthquake
	Kodaira S.; Fujiwara T.; Fujie G.; Nakamura Y.; Kanamatsu T.
发表日期	2020
ISSN	0084-6597
起始页码	321
结束页码	343
卷号	48
英文摘要	The strong ground motions, large crustal deformation, and tsunami generated by the 2011 Tohoku-oki earthquake (Mbinfweinf 9.1) reveal that a large coseismic slip likely propagated to shallow depth in the Japan Trench. Although data acquired by onshore networks cannot resolve the slip behavior of the updip fault rupture, marine geophysical and geological studies provide direct evidence of coseismic slip to the trench. Differential bathymetry data show sim50 m of coseismic seafloor displacement extending to the central Japan Trench (38-39.2degN). Seismic data show that coseismic slip ruptured the seafloor within the trench. Pelagic clays may have promoted slip propagation to shallow depths, whereas disturbed/metamorphosed clays may have restricted slip to the main rupture zone. Those observations imply that a smooth, broadly distributed, weak, clay-rich sediment in a shallow part of a subduction zone is a characteristic factor that can foster a large coseismic slip to the trench and, consequently, the generation of a large tsunami. During the 2011 Tohoku-oki earthquake (Mbinfweinf 9.1), more than sim50 m of slip occurred on a fault that ruptured the seafloor in the central Japan Trench. The fault rupture reaching the seafloor caused a large tsunami. Marine geophysical explorations revealed that a clay-rich sediment in the subduction zone was one factor fostering the large fault slip. Understanding of slip behavior in the shallow portion of a subduction zone will help us prepare for future large tsunamis along the Japan-Kuril Trench. © Copyright 2020 by Annual Reviews. All rights reserved.
关键词	Clay minerals Earthquakes Geophysical prospecting Tsunamis 2011 Tohoku-Oki earthquakes Characteristic factors Coseismic slips Crustal deformations Geophysical exploration Slip propagation Strong ground motion Subduction zones Fault slips bathymetry coseismic process crustal deformation earthquake rupture exploration ground motion seafloor slip subduction zone Tohoku earthquake 2011 trench tsunami Japan Trench Kuril Trench Pacific Ocean
语种	英语
来源机构	Annual Review of Earth and Planetary Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131906
推荐引用方式 GB/T 7714	Kodaira S.,Fujiwara T.,Fujie G.,et al. Large Coseismic Slip to the Trench during the 2011 Tohoku-Oki Earthquake[J]. Annual Review of Earth and Planetary Sciences,2020,48.
APA	Kodaira S.,Fujiwara T.,Fujie G.,Nakamura Y.,&Kanamatsu T..(2020).Large Coseismic Slip to the Trench during the 2011 Tohoku-Oki Earthquake.,48.
MLA	Kodaira S.,et al."Large Coseismic Slip to the Trench during the 2011 Tohoku-Oki Earthquake".48(2020).