题名: Mantle transition zone, stagnant slab and intraplate volcanism in Northeast Asia
作者: Chen, Chuanxu1,2; Zhao, Dapeng1; Tian, You3; Wu, Shiguo2; Hasegawa, Akira1; Lei, Jianshe4; Park, Jung-Ho5; Kang, Ik-Bum5
刊名: GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期: 2017-04-01
卷号: 209, 期号:1, 页码:68-85
关键词: Mantle processes ; Earthquake dynamics ; Subduction zone processes ; Intra-plate processes ; Hotspots ; Asia
英文摘要: 3-D P- and S-wave velocity structures of the mantle down to a depth of 800 km beneath NE Asia are investigated using similar to 981 000 high-quality arrival-time data of local earthquakes and teleseismic events recorded at 2388 stations of permanent and portable seismic networks deployed in NE China, Japan and South Korea. Our results do not support the existence of a gap (or a hole) in the stagnant slab under the Changbai volcano, which was proposed by a previous study of teleseismic tomography. In this work we conducted joint inversions of both local-earthquake arrival times and teleseismic relative traveltime residuals, leading to a robust tomography of the upper mantle and the mantle transition zone (MTZ) beneath NE Asia. Our joint inversion results reveal clearly the subducting Pacific slab beneath the Japan Islands and the Japan Sea, as well as the stagnant slab in the MTZ beneath the Korean Peninsula and NE China. A big mantle wedge (BMW) has formed in the upper mantle and the upper part of the MTZ above the stagnant slab. Localized low-velocity anomalies are revealed clearly in the crust and the BMW directly beneath the active Changbai and Ulleung volcanoes, indicating that the intraplate volcanism is caused by hot and wet upwelling in the BMW associated with corner flows in the BMW and deep slab dehydration as well.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geochemistry & Geophysics
关键词[WOS]: SEISMIC STRUCTURE BENEATH ; EAST-ASIA ; P-WAVE ; ELECTRICAL-CONDUCTIVITY ; JAPANESE ISLANDS ; POSSIBLE LINK ; TOMOGRAPHY ; CHINA ; SUBDUCTION ; PLUMES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000396820600005
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.idsse.ac.cn/handle/183446/1828]  
Appears in Collections:深海科学与工程研究所_深海科学研究部_深海地球物理与资源研究室_期刊论文


作者单位: 1.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
3.Jilin Univ, Coll Geoexplorat Sci & Technol, Changchun, Peoples R China
4.China Earthquake Adm, Inst Crustal Dynam, Beijing, Peoples R China
5.Korea Inst Geosci & Mineral Resources, Daejeon, South Korea
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