Based on the GNSS observation data from 1999 to 2007 and from 2009 to 2012,we analyzed the mode and intensity of the present horizontal tectonic motion in Shanxi-Hebei-Inner Mongolia area,by using the method of multi-kernel function analysis,horizontal movement filtering,and the arithmetic about the tectonic motion result parallel or perpendicular to the fault-belt obtained by coordinate transform formula.The results show as follows:(1) From 1999 to 2007,the horizontal tectonic activity perpendicular to the fault-belt showed tensional activity and basically uniformly transited in gradual active manner,and the maximal value was 3 mm/a in the range of about 400 km.However,there were no apparent strike-slip activity along the fault-belt,and the relative compression amount was about 1 mm/a in the range of 400 km.(2) From 2009 to 2012,the tectonic activity parallel to the fault-belt still showed compressive activity,and the tectonic activity perpendicular to the fault-belt showed the space activity of tensional and compressive alternately.This dynamic variation may be dominated by dynamic adjustment of environment stress field.
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