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A research on present horizontal crustal movement in Guanzhong area based on GPS

YAN Xue-wen,LIU Ji-hong,DONG Jun(Xi an Institute of Posts and Telecommunications,Department of Telecommunications,Xi'an 710061,China)  
On the basis of summarizing the former' research results and research experience extensively,and combining Guanzhong area geological conformation background and earthquake characteristics,the horizontal crustal movement of the region using of the GPS data is analysized,its characteristics are listed:①Relate to Yulin spot(D058),form 2002 to 2004,the movement in Guanzhong area and neighborhood appears obviously north –east direction change with banding,and also seems to take anti-clockwise rotation uncontinuitily;form 2004 to 2005,the movement in Guanzhong area and neighborhood appears dispart-block characteristic,and not seems to take integer rotation uncontinuitily;②Two sides of the Binxian-Xi'an-Lantian ray,exist a revolving shear belt with left(east side),and the revolving shear belt with left is just located near the earthquake zone of Tongchuan-Jingyang-Lintong-Weinan.Perhaps the shear belt with left mainly control the earthquake activity in middle area of Guanzhong area.In the whole,movement of east spots is disciplinary and movement rate is large,is about 6~7 mm/a;movement of middle and west spots is not disciplinary,and movement rate is small.
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