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Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea
Wang, XR (Wang, Xiaoran)1; Li, QS (Li, Qiusheng)1; Li, GH (Li, Guohui)2; Zhou, YZ (Zhou, Yuanze)3,4; Ye, Z (Ye, Zhuo)1; Zhang, HS (Zhang, Hongshuang)1
Source PublicationTECTONOPHYSICS
2018-03-15
Volume727Issue:0Pages:28-40
DOI10.1016/j.tecto.2017.12.030
Abstract

We provided a new study of the seismic velocity structure of the mantle transition zone (MTZ) beneath the northeastern South China Sea using P-wave triplications from two earthquakes at the central Philippines recorded by the Chinese Digital Seismic Network. Through fitting the observed and theoretical triplications modeled by the dynamic ray tracing method for traveltimes, and the reflectivity method for synthetic waveforms using grid-searching method, best-fit velocity models based on IASP91 were obtained to constrain the P-wave velocity structure of the MTZ. The models show that a high-velocity anomaly (HVA) resides at the bottom of MTZ. The HVA is 215 km to 225 km thick, with a P-wave velocity increment of 1.0% between 450 km and 665 km or 675 km transition and increase by 2.53.5% at 665 km or 675 km depth. The P-wave velocity increment ranges from approximately 0.3% to 0.8% below the 665 km or 675 km. We proposed that the HVA in the MTZ was caused by the broken fragments of a diving oceanic plate falling into the MTZ at a high angle, and/or by unstable thick continental lithosphere dropping into the MTZ sequentially or almost simultaneously.

Subject Area地质学
WOS IDWOS:000428826200003
Language英语
Indexed BySCIE
Keyword660 Km Discontinuity High-velocity Anomalies Mantle Transition Zone Stagnant Slab Reflectivity Method Travel-times Asia Computation Inversion Margin
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN0040-1951
Department大陆碰撞与高原隆升重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8703
Collection图书馆
Corresponding AuthorLi, QS (Li, Qiusheng)
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Key Lab Sinoprobe & Geodynam, Minist Land & Resources, Beijing 100037, Peoples R China;
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China;
3.Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China;
4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Wang, XR ,Li, QS ,Li, GH ,et al. Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea[J]. TECTONOPHYSICS,2018,727(0):28-40.
APA Wang, XR ,Li, QS ,Li, GH ,Zhou, YZ ,Ye, Z ,&Zhang, HS .(2018).Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea.TECTONOPHYSICS,727(0),28-40.
MLA Wang, XR ,et al."Seismic triplication used to reveal slab subduction that had disappeared in the late Mesozoic beneath the northeastern South China Sea".TECTONOPHYSICS 727.0(2018):28-40.
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