Search for deep slab segments under Alaska

doi:10.1016/j.pepi.2007.08.004

	Search for deep slab segments under Alaska
	Qi, Cheng 1,2; Zhao, Dapeng 1; Chen, Yong 3
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2007-11-15
卷号	165 期号:1-2 页码:68-82
关键词	seismic tomography subduction zone Kula plate ridge subduction slab window
ISSN号	0031-9201
DOI	10.1016/j.pepi.2007.08.004
文献子类	Article
英文摘要	The evolution of the northeastern Pacific Basin is very complicated, featured by many ancient plates, microplates, ridge subduction and a series of slab windows. In this work, we collected 15,804 teleseismic arrival times from original seismograms of 889 distant earthquakes to determine a three-dimensional P-wave velocity structure down to 700km depth beneath Alaska using a local and teleseismic joint inversion method. Our results show that the Pacific slab imaged as high-velocity (high-V) anomalies is subducting down to 300-400 km depth and it becomes deeper westwards under south-central and western Alaska. While in eastern Alaska, the Pacific slab is visible down to only about 90 km depth. Beneath western Alaska, high-V anomalies at 400-600 km depths are revealed, which represent the extinct Kula plate, and a gap between the subducted Pacific slab and the Kula slab is considered to represent the ancient Kula-Pacific spreading center. In southeastern Alaska, a large low-velocity (low-V) anomaly is found, which may reflect the upwelling mantle in the Pacific-Juan de Fuca slab window near the subducted edge of the Pacific plate. Our results support the existence of the Pacific-Juan de Fuca slab window suggested by the previous studies. (c) 2007 Elsevier B.V. All rights reserved.
WOS关键词	RESOLUTION TELESEISMIC TOMOGRAPHY ; WAVE VELOCITY STRUCTURE ; TRAVEL-TIME INVERSION ; UPPER-MANTLE ; SUBDUCTION ZONE ; SOUTHERN ALASKA ; STRUCTURE BENEATH ; P-WAVE ; EARTHQUAKE LOCATION ; NORTHEASTERN JAPAN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000251596500006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68248]
专题	中国科学院地质与地球物理研究所
通讯作者	Qi, Cheng
作者单位	1.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 3.China Earthquake Adm, Inst Earthquake Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Qi, Cheng,Zhao, Dapeng,Chen, Yong. Search for deep slab segments under Alaska[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2007,165(1-2):68-82.
APA	Qi, Cheng,Zhao, Dapeng,&Chen, Yong.(2007).Search for deep slab segments under Alaska.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,165(1-2),68-82.
MLA	Qi, Cheng,et al."Search for deep slab segments under Alaska".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 165.1-2(2007):68-82.