STUDY ON MOTION CHARACTERISTICS AND STRAIN ACCUMULATION OF XIAOJIANG FAULT ZONE
小江断裂带的运动及应变积累特征研究

Using the GPS velocity field data from 1999-2001,2001-2004 and 2004-2007 on short time scales,we studied the overall motion characteristics of Xiaojiang fault through linear model of block(RELSM),and reached the result that its average left-lateral slip rate is about 3.0~7.1 mm/a.According to the segmentation of surface rupture of fault due to historical earthquakes,we analyze the different characteristics of space-time of strain accumulation on every fragment by using the method of GPS velocity profile.The results indicated as follows.1)The sections in different time periods of Xiaojiang fault have better consistency on relative motion and deformation mode,are sinistral strike-slip and pull-apart movement characteristics.2)RELSM results show segment difference and decrease of slip rate from north to south.3)Strain accumulation features show,the northern section above middle north section,middle south section and the southern section are not conducive to the accumulation or low levels of it.4)The northern section of Xiaojiang fault zone is abnormal regions which was relatively closed and there was high rate of shear strain accumulation.