ANALYSIS ON HORIZONTAL DEFORMATION OF SHANXI RIFT ZONE IN RECENT YEARS

The movement that Shanxi rift zone departures from its tendency in recent years is calculated with the data in 6 observations(1999~2004) in the GPS monitoring network along Shanxi rift zone.The results show that, (1) as the differential sites accounted for only 1/10, which was S21, S20, S30 and S33 site respectively, the differential movement with maximum of 6mm/a was not notable;(2) the whole rift zone had a sign to move in south and north direction, with a rate about 2.0 mm/a;(3) the departure movement in 2005 was obvious, which its largest velocity is about 7 mm;(4)The accumulative departure in 2006 is about 6mm, it indicates there is almost no deviation in 2006.As the variation is comparatively steady, the recent level of seismic activity in the zone may not be high.