DEFORMATION SECTION IN TIANJIN AND BEIJING AREA

With the vertical time sequence results computed by the monitoring data(until Aug,2008) from 28 GPS stations of continuous observation in Tianjin and Beijing Area,the paper analyzes the variation characteristics of vertical component of each GPS continuous stations,calculates the vertical movement velocity of GPS stations in Tianjin and Beijing Area of 2007~2008,compares with the vertical deformation velocity calculated by leveling of 2007~2008 in Capital Circle Area;Furthermore,searches GPS stations nearby the leveling route,corresponding to the first and second leveling time period,calculates the section plane of GPS route,analyzes and compares the section results of GPS and leveling of 2 time periods.Through this kind of "from surface to line" synthesis comparison between leveling and GPS results,acquires primary conclusion: GPS and leveling results is similar from the elementary trend,GPS results also reflect that there exists rise evidence in the neighborhood of southeast of Beijing in 2008,but the value is smaller than leveling results,the characteristic of "rise in south and subsidence in north" reflected by leveling results is also validated to a certain extent in GPS results.