???-???6.6????????½?????????α???????????????

?????????2009??2011??223??GPS?????????????????????????????????????????????????????85??E??43??N??磬??????????????????????????????????????GPS??????????????????????????????????????????????????????2011.08??2012.25?????29??GPS???????????????е????????????仯????????????????????仯????2011.4???????????2011.8????????????????С????????С???????α???????????????в???????????????????????????λ???????????XJKL??????????????????仯??????????仯????????????????????????????????????ε??????????????????嵽????????????仯????6.0?????μ?????????????

ANALYSIS OF RELATION BETWEEN CRUSTAL DEFORMATION AND SEISMIC ACTIVITY IN XINJIANG REGION BEFORE HEJING-XINYUAN Ms6.6 EARTHQUAKE

On the basis of velocity analysis of the 223 GPS regional sites in Xinjiang region during 2009 to 2011, the horizontal movement characteristics of the sites are obvious different from each other in the east to west and north to south partitioned by 85 °E and 43 °N . The high surface expansion rates appear in two areas: Kashi region and Yining Aksu region from the GPS observations where the earthquakes are prone to happening. Analysis of time series of the coordinate changes of 29 GPS stations during 2011.08 to 2012.25 shows that the variation of each station becomes larger after 2011.4 and after 2011.8, the value of the majority of observation stations appear in a process of small increase decrease. The deformation results show there the energy accumulate obviously in the middle area of Tianshan mountain.The coordinate changes of the observation station XJKL located in the Junggar block and the stations in West Kunlun block show bigger fluctuation.The changes reflect that the crustal movement of the whole Xinjiang region becomes more active which is the background that earthquakes have happened frenquently in the period. To each station, the change is not obviously related relrted with earthquakes below \%M\%s6.0.