Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia

doi:10.1016/j.pepi.2016.01.001

	Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia
	Jiang, MM (Jiang, Mingming); Shen, ZY (Shen, Zhongyin)1,2; Ai, YS (Ai, Yinshuang); He, YM (He, Yumei); Shen, ZY
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2016
卷号	252 期号:0 页码:37-48
关键词	Mantle Boundary Lowermost Mantle Scale Heterogeneity Amplitude Ratios Travel-times Earths Core Topography Velocity Density Wave
DOI	10.1016/j.pepi.2016.01.001
文献子类	Article
英文摘要	We collected 177 pre-critical PKiKP-PcP records, assembling a wealth of traveltime and amplitude data. These observations sample the inner core boundary (ICB) beneath East Asia with good spatial coverage. Combined with previous studies, our results demonstrate a 100-km-wide anomaly with positive PKiKPPcP traveltime residuals surrounded by negatives beneath the Yellow Sea area (123 degrees E, 33 degrees N) (Yellow Sea anomaly). After correcting the elliptic effects and mantle Vp heterogeneities based on the tomography models, the residuals of the Yellow Sea anomaly remain at least 0.6 s faster than those of the surrounding areas, suggesting a thickening of 2-3 km between the ICB and core mantle boundary (CMB). Due to the negative CMB topography along the western Pacific rim, we attribute this anomaly mainly to negative ICB topography. Across the northern border of the Yellow Sea anomaly, PKiKP/PcP amplitude ratios increase by approximately 50% from north to south, which can be explained by an approximately 0.6 g/cm(3) raise in ICB density contrast. These traveltime and amplitude features suggest a mosaic structure at the ICB beneath the Yellow Sea areas. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	地质学
语种	英语
WOS记录号	WOS:000371840900003
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/7754]
专题	青藏高原研究所_图书馆
通讯作者	Shen, ZY
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Ctr Excellence Tibetan Plateau Earth Sci, 16 Lincui Rd, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Jiang, MM ,Shen, ZY ,Ai, YS ,et al. Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2016,252(0):37-48.
APA	Jiang, MM ,Shen, ZY ,Ai, YS ,He, YM ,&Shen, ZY.(2016).Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,252(0),37-48.
MLA	Jiang, MM ,et al."Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 252.0(2016):37-48.