??????GPS?????????仯?????о?

???????GPS????????????????????????????λ????????????????????????????о????????????λ??仯?????????????????????????????2006????????2008?????????????????仯?????????????????????????2006??????????λ???????2004??2010??????????????????????2006??3??4????????????????????????????????????????????????????2006??7??4????????????????????????????Ms5.1??????2008????????????????λ?????????????????????Ms8.0?????????????α?

MICRO-DYNAMIC CHARACTERISTICS OF GPS SITES IN TIANJIN AREA

On the basis of the continuous displacement parameters of each site and the overall strain rate parameters of the Tianjin area obtained from the observational data of Tianjin GPS local network, the micro dynamic displacement of each site and the micro dynamic crustal strain rate of the Tianjin area as a whole were studied. The results show that in the first half of 2006 and whole 2008, there was a substantial change in the majority of the sites, which shows that the activity in the crust enhanced in this period. The sites displacement value in the first half of 2006 were the maximum during the period 2004-2010, and crustal strain rate of Tianjin in March April 2006 also reached the maximum. The compressive strain axis significantly deviated from the normal direction of the area(normal NEE ).On July 4,2006 , Wenan Ms5.1 earthquake was occurred near the southwest of Tianjin. The displacements of part sites of the Tianjin area relatively increased in 2008, which may be affected by the far field deformation of the Wenchuan Ms8.0 earthquake.