CURRENT TECTONIC MOVEMENT OF SOUTH CHINA SEA AND ITS SURROUNDING AREAS
Li Yanxing 1) ;Zhang Jinghua 1) ;Zhou Wei 1) ;Luan Xiwu 2) ;Hu Xinkang 1) ; and Zhang Zhongfu 1)
1) First Crust Monitoring and Application Center, CEA, Tianjin 300180 2) Institute of Ocean Science, Chinese Academy of Sciences, QingDao 266003
Abstract We collected and processed the site velocities of South China Sea(SCS) and its surrounding areas and obtained unified velocity field in ITRF2005. By analyzing the spatial variation of the velocity field and strain field, and relative motions between blocks it is discovered that the SCS extends still up to now. The western part of SCS is opening gradually NWSE from its northern margin to south, but the eastern part of SCS is opening gradually from its central part to north and to south. On the basis of computed results of strain field, the average extension rate in about SN is 3.1 mm/a in the CSB and extension rate in SN is 9.3 mm/a in eastern part of SCS 117°E between 11°N and 22°N which is smaller than the average extension rate of 13.0 mm/a along NNWSSE since 65 Ma. The expansive motion of the SCS is resulted from the common effects between Indian plate, Pacific plate, Philippine Sea plate and Eurasian plates, and the upwelling of the mantle matters of SCS area.
Key words ：
South China Sea(SCS)
velocity field
strain field
expansive model
dynamic mechanism
Received: 01 January 1900
Corresponding Authors:
Li Yanxing
Cite this article:
Li Yanxing ,Zhang Jinghua ,Zhou Wei et al. CURRENT TECTONIC MOVEMENT OF SOUTH CHINA SEA AND ITS SURROUNDING AREAS[J]. , 2010, 30(第3期): 10-16.
Li Yanxing ,Zhang Jinghua ,Zhou Wei et al. CURRENT TECTONIC MOVEMENT OF SOUTH CHINA SEA AND ITS SURROUNDING AREAS[J]. jgg, 2010, 30(第3期): 10-16.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2010/V30/I第3期/10
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