Crust and upper mantle structure of the New Madrid Seismic Zone: Insight into intraplate earthquakes

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Crust and upper mantle structure of the New Madrid Seismic Zone: Insight into intraplate earthquakes
	Chen, Chuanxu1,2,3 ; Zhao, Dapeng 1; Wu, Shiguo 2
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2014-05-01
卷号	230 页码:1-14
关键词	New Madrid Seismic Zone Seismic tomography Low-velocity zone Intraplate earthquakes Farallon slab Seismotectonics
通讯作者	Chen, CX (reprint author), Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan.
英文摘要	We determine a 3-D P-wave velocity model of the crust and upper mantle down to 400 km depth to investigate structural heterogeneity and its influences on the generation of intraplate earthquakes in the New Madrid Seismic Zone. We used 4871 high-quality arrival times from 187 local earthquakes and 30,846 precise travel-time residuals from 1041 teleseismic events recorded by the EarthScope/USArray Transportable Array. Our results show that, beneath the Reelfoot rift, a significant low-velocity (low-V) zone exists in the upper mantle down to 200 km depth, with a large volume of 200 x 200 x 150 km(3). The origin of the low-V zone may be related to the passage of the Bermuda hotspot and the stalled ancient Farallon slab materials foundering in the mantle transition zone. This low-V zone may have relatively low shear strength and act as a viscously weak zone embedded in the lithosphere, being apt to concentrate tectonic stress and transfer stress to the seismogenic faults in the upper crust, leading to the large intraplate earthquakes in the New Madrid Seismic Zone. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Geochemistry & Geophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000337204700001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/23807]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan 2.Chinese Acad Sci, Inst Oceanog, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chen, Chuanxu,Zhao, Dapeng,Wu, Shiguo. Crust and upper mantle structure of the New Madrid Seismic Zone: Insight into intraplate earthquakes[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2014,230:1-14.
APA	Chen, Chuanxu,Zhao, Dapeng,&Wu, Shiguo.(2014).Crust and upper mantle structure of the New Madrid Seismic Zone: Insight into intraplate earthquakes.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,230,1-14.
MLA	Chen, Chuanxu,et al."Crust and upper mantle structure of the New Madrid Seismic Zone: Insight into intraplate earthquakes".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 230(2014):1-14.