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Velocity Gradients Below the 410-km Discontinuity Beneath Eastern Asia and Its Implication on Water Content Distribution

文献类型：期刊论文

作者Wang, Yi2,3; He, Yumei4; Li, Juan1,4,5
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2022-11-16
卷号49期号:21页码:9
ISSN号0094-8276
关键词mantle transition zone triplication waveform velocity gradient water content south and southwest China northeast Asia
DOI10.1029/2022GL099942
英文摘要The velocity gradient below the 410-km discontinuity provides clues for the water content gradient in the mantle transition zone. Here we report an abnormal X phase refracted below the 410, providing a unique opportunity to constrain the velocity gradient at that depth. We observe the X phase sampling the MTZ beneath south and southwest China close to the subducted Paleo-Pacific slab, compared to the typical triplication waveforms sampling northeast Asia, the modern Pacific subduction system. The P velocity gradient below the 410 is 0.0028 s(-1) or lower beneath south and southwest China, indicating a uniform water content; while it is 0.0037 s(-1) or higher beneath northeast Asia, suggesting a water content decreasing from the 410-km downward. Our research provides seismic evidence for water infiltrating the MTZ from a hydrous layer atop the 410 and then widely diffused into the MTZ after long-term subduction.
WOS关键词TRANSITION-ZONE ; SH-VELOCITY ; MANTLE ; CONSTRAINTS ; PHASE ; EARTH
资助项目Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201904]
WOS研究方向Geology
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000879815600001
资助机构Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/107716]  
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He, Yumei
作者单位1.Chinese Acad Sci, Heilongjiang Mohe Observ Geophys, Inst Geol & Geophys, Beijing, Peoples R China
2.Univ Sci & Technol China, Lab Seismol & Phys Earths Interior, Sch Earth & Space Sci, Hefei, Peoples R China
3.Natl Geophys Observ Mengcheng, Mengcheng, Anhui, Peoples R China
4.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Yi,He, Yumei,Li, Juan. Velocity Gradients Below the 410-km Discontinuity Beneath Eastern Asia and Its Implication on Water Content Distribution[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(21):9.
APA Wang, Yi,He, Yumei,&Li, Juan.(2022).Velocity Gradients Below the 410-km Discontinuity Beneath Eastern Asia and Its Implication on Water Content Distribution.GEOPHYSICAL RESEARCH LETTERS,49(21),9.
MLA Wang, Yi,et al."Velocity Gradients Below the 410-km Discontinuity Beneath Eastern Asia and Its Implication on Water Content Distribution".GEOPHYSICAL RESEARCH LETTERS 49.21(2022):9.

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来源：地质与地球物理研究所

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