Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone

doi:10.6038/cjg2018L0484

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone
	Wang XiuJiao 1,2; Han GuangJie 1,3; Jua, Li 1,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-03-01
卷号	61 期号:3 页码:819-831
关键词	Seismic Triplication 410-km Discontinuity Low-velocity Layer Northwest Pacific Subduction Zone
ISSN号	0001-5733
DOI	10.6038/cjg2018L0484
文献子类	Article
英文摘要	Since the first detection of the low-velocity layer atop the 410-km discontinuity in 1990s, the seismic structure has been revealed in many subduction zones and continental craton regions. Its characteristics and mechanism of formation are among one of the hottest topics in studies of deep mantle structure, physical properties of mantle material, and geodynamic processes. We focus on the detection and feature investigation of the low-velocity layer atop the 410-km discontinuity in the northwestern Pacific subduction zone in this study. By modeling P triplicate waveforms from two intermediate-depth earthquakes, which are recorded by regional network stations, we obtain the P wave velocity structure near the 410-km discontinuity beneath northeast China and northwest area of Japan Sea. A low-velocity layer with thickness similar to 47 +/- 14 km and similar to 2% velocity anomaly is detected above the Mantle Transition Zone, covering a lateral range around 700 km. Combined with results from regional seismic tomography, high pressure and high temperature experiments and geodynamic simulations, we regard the "bottom-to-up" upwelling model an unlikely mechanism for the observed low-velocity layer; instead, we propose that the low-velocity layer may represent the partially melted silicates caused by dehydration of the cold and fast subducting Pacific slab near the 410-km discontinuity. The higher density makes it stable at the 410 km depth and produces the observed widely distributed low-velocity layer.
WOS关键词	NOMINALLY ANHYDROUS MINERALS ; BENEATH NORTHEAST CHINA ; DEEP SEISMIC STRUCTURE ; ELECTRICAL-CONDUCTIVITY ; RECEIVER FUNCTIONS ; STAGNANT SLAB ; EARTHS MANTLE ; DISCONTINUITY ; WATER ; COMPUTATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000428609900002
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88361]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Jua, Li
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.PetroChina Res Inst Petr Explorat & Dev, Dept Geophys Explorat Technol, Beijing 100083, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang XiuJiao,Han GuangJie,Jua, Li. Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(3):819-831.
APA	Wang XiuJiao,Han GuangJie,&Jua, Li.(2018).Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(3),819-831.
MLA	Wang XiuJiao,et al."Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.3(2018):819-831.