Zhangjiakou-bohai Seismic Belt Deformation Based on GPS Observation

In this study, we calculated horizontal deformation of local GPS station and vertical deformation of the 27 GPS continuous station in the Zhangjiakou-bohai seismic belt area on basis of 5 periods' observation data of the local GPS station and the 27 continuous stations. The results indicate that the deformation of the Zhangjiakou-bohai seismic belt in the period of 2011-2013 is relatively large and different than before. The Zhangjiakou-bohai seismic belt is in compressive stress state and the strain energy accumulation is enhancing, which indicates that the deformation difference activity is increasing and the background of developing earthquakes exists in the area.