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学科主题: 地球科学::地质学
题名: Using pre-critical PKiKP-PcP phases to constrain the regional structures of the inner core boundary beneath East Asia
作者: Shen, ZY (Shen, Zhongyin)1, 2; Ai, YS (Ai, Yinshuang); He, YM (He, Yumei); Jiang, MM (Jiang, Mingming)
通讯作者: Shen, ZY
刊名: PHYSICS OF THE EARTH AND PLANETARY INTERIORS
发表日期: 2016
DOI: 10.1016/j.pepi.2016.01.001
卷: 252, 期:0, 页:37-48
收录类别: SCI
合作性质: 国内
文章类型: 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.
语种: 英语
WOS记录号: WOS:000371840900003
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7754
Appears in Collections:图书馆_期刊论文

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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

Recommended Citation:
Shen, ZY ,Ai, YS ,He, YM ,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.
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文件名: V.252 37-48 2016.pdf
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