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Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data
Huang, Haibo1,2; Qiu, Xuelin1,2,4; Zhang, Jiazheng1,2; Hao, Tianyao3
2019-12-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume186Pages:10
AbstractThe receiver function method was applied to teleseismic recordings of an active-source ocean-bottom seismometer array in the northwestern margin of the South China Sea. Forward modeling of the receiver functions was used to derive velocity interfaces beneath the stations. Two main groups of low-velocity layers were imaged. The first group in the reef area, with a thickness of 7-10 km, exhibits a seaward uptrend of the buried depth but poor continuity. The second group, with a thickness of 3-4 km, is more continuous along the Zhongsha Trough; the buried depth decreases asymmetrically from the flanks to the rift center. A high shear wave velocity layer of similar to 4.0 km/s is imaged at the crust bottom beneath the Zhongsha Trough, with thickness of similar to 3 km. The average Vp/Vs in the Cenozoic sediment is 2.0-3.0 and was affected by high fluid activity induced by intensive faults. The Vp/Vs of the crust varies between 1.77 and 1.88, suggesting an intermediate to basic composition under the continental extension. Together, these results suggest a two-stage evolution model of the continental crust. In the first stage, the crust deformed in a ductile manner and thus created considerable shearing structures with high anisotropy that caused the obvious decrease of the shear wave velocity. In the second stage, the shearing structures connected asymmetrically, driven by detachment faults in the upper crust and upwelling of the lower crust. The Zhongsha Trough then formed, probably with magmatic underplating due to lithospheric extension or rising of hot mantle materials.
KeywordLow-velocity layer Shearing structure Magmatic underplating Receiver function Ocean bottom seismometer South China Sea
DOI10.1016/j.jseaes.2019.104090
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project
WOS KeywordCRUSTAL STRUCTURE BENEATH ; DEEP-WATER AREA ; QIONGDONGNAN BASIN ; XISHA ISLANDS ; P-WAVE ; FLOW ; ORIGIN ; FAULT ; ZONE ; IDENTIFICATION
Language英语
Funding ProjectNational Natural Science Foundation of China[41306046] ; National Natural Science Foundation of China[41676045] ; National Natural Science Foundation of China[41674092] ; Guangdong NSF research team project[2017A030312002]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong NSF research team project ; Guangdong NSF research team project
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000504524700011
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95847
Collection油气资源研究院重点实验室
Corresponding AuthorHuang, Haibo
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Guangdong, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Huang, Haibo,Qiu, Xuelin,Zhang, Jiazheng,et al. Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,186:10.
APA Huang, Haibo,Qiu, Xuelin,Zhang, Jiazheng,&Hao, Tianyao.(2019).Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data.JOURNAL OF ASIAN EARTH SCIENCES,186,10.
MLA Huang, Haibo,et al."Low-velocity layers in the northwestern margin of the South China Sea: Evidence from receiver functions of ocean-bottom seismometer data".JOURNAL OF ASIAN EARTH SCIENCES 186(2019):10.
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