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《Chinese Journal of Geophysics》 2007-06
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Preliminary study on seismic anisotropy in the crust in southeast of Cathaysia Block

WU Jing~1,GAO Yuan~(1),CAI Jin-An~1,SHI Yu-Tao~1,LIN Shu~2,BAO Ting~2,LI Zu-Ning~21 Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China2 Earthquake Administration of Fujian Province,Fuzhou 350003,China  
With SAM shear-wave splitting analysis and seismic wave data of Fujian Seismic Network(FJSN) from Jan.1999 to Dec.2003,seismic anisotropic parameters of 10 stations are obtained in southeast of Cathaysia block(23°N~29°N,116°E~120°E).The results show that the average polarization of fast shear-waves is NW109.4°±42.6°,and the average time delay of slow shear-waves is 2.5±1.5(ms/km).It is shown that the average polarization of fast shear-waves corresponds to the horizontal principal compressive stress of Fujian area.The predominant polarizations of stations in eastern Fujian are in NW direction,which suggests that the predominant polarizations are related to the horizontal principal compressive stress in Fujian,as well as to the strikes of faults in eastern Fujian.However,the predominant polarizations of two stations in western Fujian are in NE direction.It is shown that the predominant polarizations in western Fujian are different from the direction of horizontal principal compressive stress of Fujian area,but same with the strikes of faults in western Fujian area,which means that local tectonics and local stress field are very complicated.The results prove that the predominant polarizations are parallel to the strikes of faults if the stations are on active faults.It is also proved that the polarizations are scattered if the stations are on seashore or on isles, which may be caused by irregular topography and crossing faults.From the spatial distribution of time delay of slow shear-waves,it is shown that the change of time delays is more obvious in seashore area than inland.
【Fund】: 中国地震局地震预测研究所基本科研专项(2007-24) ;; 闽科计[2002y004]和地震科学联合基金(青年基金)606045共同资助
【CateGory Index】: P315
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