SCSIO OpenIR  > 中科院边缘海地质重点实验室
Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data
Zhao, MH; Qiu, XL; Xia, SH; Xu, HL; Wang, P; Wang, TK; Lee, CS; Xia, KY; mhzhao@scsio.ac.cn; xlqiu@scsio.ac.cn; shxia@scsio.ac.cn; hlxu@scsio.ac.cn; pwang@scsio.ac.cn; tkwang@mail.ntou.edu.tw; leecs@mail.ntou.edu.tw; kyxia@scsio.ac.cn
2010
Source PublicationTECTONOPHYSICS
ISSN0040-1951
Volume480Issue:40547Pages:183-197
AbstractA nearly 500-km-long seismic profile with reflective and refractive wide-angle Ocean Bottom Seismometer (OBS) data and Multi-Channel Seismic (MCS) data was acquired across the northeastern continental margin of the South China Sea (SCS). The S-wave crustal structure and Vp/Vs ratios have been obtained based on a previously published P-wave model using the software Raylnvr. Modeling of vertical- and horizontal-component OBS data yields information on the seismic crustal velocities, lithology, and geophysical properties along the OBS-2001 seismic profile. S-wave velocities in the model increase generally with depth but exhibit high spatial variability, particularly from the shelf to the upper slope of the northeastern SCS margin. Vp/Vs ratios also reveal significant lithological heterogeneity. Dongsha-Penghu Uplift (DPU) is a tectonic zone with a thicker crust than adjacent areas and a high magnetic anomaly. With a Vp/Vs of 1.74 and a P-wave velocity of 5.0-5.5 km/s, the DPU primarily consists of felsic volcanic rocks in the upper crust and is similar to the petrology of Zhejiang-Fujian volcanic provinces, which perhaps is associated with a Mesozoic volcanic arc. The ocean-continent transition (OCT) in the northeastern SCS is characterized by a thinning continental crust, volcanoes in the upper crust, and a high velocity layer (HVL) in the lower crust. The S-wave velocity and Vp/Vs ratio suggest that the HVL has a mafic composition that may originate from underplating of the igneous rocks beneath the passive rifted crust after the cessation of seafloor spreading. (c) 2009 Elsevier B.V. All rights reserved.
Department[Zhao, Minghui; Qiu, Xuelin; Xia, Shaohong; Xu, Huilong; Wang, Ping; Xia, Kanyuan] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wang, Tan K.; Lee, Chao-Shing] Natl Taiwan Ocean Univ, Inst Appl Geosci, Chilung 20224, Taiwan
KeywordConverted S-wave Crustal Structure Vp/vs Ratios The norTheastern South China Sea
Subject AreaGeochemistry & Geophysics
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Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000274054700014
Citation statistics
Cited Times:70[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/4350
Collection中科院边缘海地质重点实验室
Corresponding Authormhzhao@scsio.ac.cn; xlqiu@scsio.ac.cn; shxia@scsio.ac.cn; hlxu@scsio.ac.cn; pwang@scsio.ac.cn; tkwang@mail.ntou.edu.tw; leecs@mail.ntou.edu.tw; kyxia@scsio.ac.cn
Recommended Citation
GB/T 7714
Zhao, MH,Qiu, XL,Xia, SH,et al. Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data[J]. TECTONOPHYSICS,2010,480(40547):183-197.
APA Zhao, MH.,Qiu, XL.,Xia, SH.,Xu, HL.,Wang, P.,...&kyxia@scsio.ac.cn.(2010).Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data.TECTONOPHYSICS,480(40547),183-197.
MLA Zhao, MH,et al."Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data".TECTONOPHYSICS 480.40547(2010):183-197.
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