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学科主题: Geochemistry & Geophysics
题名: Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data
作者: Zhao, MH ; Qiu, XL ; Xia, SH ; Xu, HL ; Wang, P ; Wang, TK ; Lee, CS ; Xia, KY
通讯作者: 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
关键词: Converted S-wave ; Crustal structure ; Vp/Vs ratios ; The northeastern South China Sea
刊名: TECTONOPHYSICS
发表日期: 2010
卷: 480, 期:40547, 页:183-197
收录类别: sci
部门归属: [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
项目归属: 海洋地质
摘要: A 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.
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WOS记录号: WOS:000274054700014
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4350
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhao, MH; Qiu, XL; Xia, SH; Xu, HL; Wang, P; Wang, TK; Lee, CS; Xia, KY.Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data,TECTONOPHYSICS,2010,480(40547):183-197
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