Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 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
刊名	TECTONOPHYSICS
	2010
卷号	480 期号:40547 页码:183-197
关键词	Converted S-wave Crustal structure Vp/Vs ratios The northeastern South China Sea
ISSN号	0040-1951
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
中文摘要	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.
学科主题	Geochemistry & Geophysics
收录类别	SCI
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000274054700014
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4350]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 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.,...&Xia, KY.(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.