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Identification and analysis of shear waves recorded by three-component OBSs in northeastern south china sea

Progress in Natural Science:Materials International 2008年第2期18卷 181-188页

作者： Minghui Zhao ,Xuelin Qiu,Shaohong Xia,Ping Wang,Kanyuan Xia,Huilong Xu Key Laboratory of Marginal sea Geology,south china sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,china Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Structure models associated with P-and S-wave velocities contain considerable amount of information on lithology and geophysical properties,which can be used to better understand the complexity of the deep crustal structure. However,records of converted shear waves are less due to the speciality of seismic survey at sea and the rigorous generated conditions. The study on shear waves has always been a weakness for studying the deep crustal structures of south china sea (SCS). In this paper,eleven three-component OBSs were deployed along the Profile OBS-2001 in northeastern SCS. After the data processing of polarization and band-pass filter,converted S-wave phases were identified in the radical component records of nine OBSs. Taking the OBS7 as an example,identification and analysis of converted shear waves were presented and discussed in detail. A few phase groups,such as PwSc,PgSs,PnSc,PmS,and PwSn,were found coming from the deep crust or Moho interface by simple theoretical model calculation and ray-tracing simulation. The results not only provide the underlying basis for studies of S-wave velocity structure and Poisson’s ratio structure,but also reveal the relationship between crustal petrology and seismology,which will be of importance for making full use of S-wave information in the future.

关键词： Converted shear wave Deep crustal structure Three-component ocean bottom seismometer northeastern south china sea

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Sectional distribution of salinity and its indication of Kuroshio'sintrusion in the southern Taiwan Strait and northeastern south china sea late summer, 1994

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Acta Oceanologica Sinica 1999年第2期18卷 225-236页

作者： Hu Jianyu Liang Hongxing and Zhang Xuebin 1. Institute of Subtropical Oceanography, Xiamen University, Xiamen 361005, china 2. Fujian Institute of Oceanology, Xiamen 361012, china (Received June 3, 1998 accepted August 8, 1998) Inst. of Subtropical Oceanography Xiamen University Xiamen 361005 China Fujian Institute of Oceanology Xiamen 361012 China

Using the CTD data investigated at about 330 stations in the southern Taiwan Strait, the northeastern south china sea and their adjacent seas in August and September of 1994, this paper anayses the sectional distributions of salinity in 10 selected sections and discusses the possibility of the Kuroshio's intrusion into the northeastern south china sea and the southern Taiwan Strait. The results show that: as the main stream of Kuroshio passes by the northern Luzon Strait during the survey period, the 'Kuroshio-influenced water' with some hydrological features of the Kuroshio may extend through the Luzon Strait to the sea areas near both the Dongsha Islands and the Taiwan Shoal of the southern Taiwan Strait.

关键词： Sectional distribution of salinity Kuroshio's intrusion late summer southern Taiwan Strait northeastern south china sea

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