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《Engineering of Surveying and Mapping》 2008-01
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Characteristics of present-day crustal deformation and seismicity in western China

LI Jin-ping1,2(1.China University of Mining and Technology,Beijing 100083,China;2.Department of Surveying and Mapping Engineering,Heilongjiang Institute of Technology,Harbin 150050,China)  
Based on the measurements of about 650 GPS stations in Western China observed in the period from 1999 to 2004,it uses the "spline in tension" interpolation method to obtain a continuous velocity field of crustal movement.The results indicate that in a stable Eurasia reference frame,the crustal movement in the western part of the region is larger than that of the eastern part.From West to East,the north component of the movement gradually becomes smaller,and the east component gradually becomes higher.The east edge of the Tibet Plateau and its vicinity are areas with declined east movement.The principal strain is gradually changing from compression in the western area to extension in the eastern area.The high shear strain rates are located in the Himalayan block and its east regions.It seems that many earthquakes happened along two conjugate zones in Chinese mainland produced by the convergence between the India and Eurasia during the period from 1995 to 2006.The seismic activity is corresponding to crustal deformation rate,i.e.more earthquakes occurred in the regions with higher strain rates.
【Fund】: 国家自然科学基金资助项目(40674055)
【CateGory Index】: P315.2;P313.4
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