气候变化领域集成服务门户(CCPortal): Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia

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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
	Shen, Zhongyin; Ai, Yinshuang; He, Yumei; Jiang, Mingming
通讯作者	Shen, ZY (通讯作者)
发表日期	2016
ISSN	0031-9201
EISSN	1872-7395
起始页码	37
结束页码	48
卷号	252
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.
关键词	LOWERMOST MANTLE SCALE HETEROGENEITY AMPLITUDE RATIOS TOPOGRAPHY VELOCITY DENSITY TOMOGRAPHY CONTRAST GROWTH MODEL
英文关键词	Inner core boundary; PKiKP; Travel time residual; Amplitude ratio
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000371840900003
来源期刊	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258630
推荐引用方式 GB/T 7714	Shen, Zhongyin,Ai, Yinshuang,He, Yumei,et al. Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia[J]. 中国科学院青藏高原研究所,2016,252.
APA	Shen, Zhongyin,Ai, Yinshuang,He, Yumei,&Jiang, Mingming.(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.
MLA	Shen, Zhongyin,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(2016).