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Seismic evidence for an 850 km thick low-velocity structure in the Earth's lowermost mantle beneath Kamchatka

文献类型：期刊论文

作者He, Yumei1; Wen, Lianxing2,3; Zheng, Tianyu1
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2014-10-28
卷号41期号:20页码:7073-7079
关键词core-mantle boundary low-velocity structure D Kamchatka mantle plume
ISSN号0094-8276
DOI10.1002/2014GL061249
文献子类Article
英文摘要We detect an 850 km thick low-velocity structure in the Earth's lowermost mantle beneath Kamchatka surrounded by and overlying a 210 km thick high-velocity D structure. The velocity structure is constrained by modeling the observed anomalously broadened waveforms for seismic shear waves sampling the lowermost mantle recorded at large distances from 90 degrees to 100 degrees. Waveform modeling analyses reveal that the low-velocity anomaly has a stem with a diameter of about 550km in the lowermost 210km of the mantle and a cap with a diameter of about 1600km. The low-velocity structure of the cap decreases from 0% at the top to -1.5% at about 400km above the core-mantle boundary (CMB) and to -1.2% at 210km above the CMB. We suggest that the geometrical and velocity features of the low-velocity anomaly indicate that it may represent a localized mantle plume undetected before in the lower mantle.
WOS关键词INDIAN-OCEAN ; BOUNDARY ; BASE ; DISCONTINUITY ; AFRICAN ; WAVE
WOS研究方向Geology
语种英语
WOS记录号WOS:000345343100012
出版者AMER GEOPHYSICAL UNION
资助机构National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; 1214215) ; 1214215) ; 1214215) ; 1214215) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; 1214215) ; 1214215) ; 1214215) ; 1214215) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; 1214215) ; 1214215) ; 1214215) ; 1214215) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; National Science Foundation of China(41125015) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; NSF(0911319 ; 1214215) ; 1214215) ; 1214215) ; 1214215)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84842]  
专题中国科学院地质与地球物理研究所
通讯作者He, Yumei
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
3.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Peoples R China
推荐引用方式
GB/T 7714		 He, Yumei,Wen, Lianxing,Zheng, Tianyu. Seismic evidence for an 850 km thick low-velocity structure in the Earth's lowermost mantle beneath Kamchatka[J]. GEOPHYSICAL RESEARCH LETTERS,2014,41(20):7073-7079.
APA He, Yumei,Wen, Lianxing,&Zheng, Tianyu.(2014).Seismic evidence for an 850 km thick low-velocity structure in the Earth's lowermost mantle beneath Kamchatka.GEOPHYSICAL RESEARCH LETTERS,41(20),7073-7079.
MLA He, Yumei,et al."Seismic evidence for an 850 km thick low-velocity structure in the Earth's lowermost mantle beneath Kamchatka".GEOPHYSICAL RESEARCH LETTERS 41.20(2014):7073-7079.

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来源：地质与地球物理研究所

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