GPS观测得到的中国大陆地壳垂直运动

利用中国地壳运动观测网络基准站的GPS连续观测及基本站非连续GPS观测结果，分析了基准站垂直位移的年周期变化特点，讨论了获得中国大陆垂直位移长趋势速率的条件，说明由基本站（连同基准站）多期GPS观测得到的长趋势垂直位移速率是较为可靠的。由于不少GPS观测站有幅度达数cm的年周期变化及大部分区域站观测次数少，由1999年、2001年两期区域站GPS观测难以得到可靠的长趋势垂直构造运动速率。基本站的观测结果表明中国大陆长趋势垂直构造运动主要特点是，速率较低，北升，南降，东强，西弱，西部相对东部略有下降。

Vertical crustal movement obtained from GPS observation in China's mainland

Based on the results of continuous GPS observation at the fiducial stations and non continuous GPS observation at basic stations in the Crustal Movement Observation Network of China, the annual periodic variations in vertical displacement at fiducial stations are analyzed, and the conditions to obtain long term vertical displacement velocities in Chinas mainland from non continuous GPS observations are discussed. It is suggested that the long term linear velocities of vertical displacement at the basic stations (including fiducial stations) from GPS observation of several campaigns are reliable. Because of annual periodic variations of large amplitudes of several cm at some GPS stations and repeated GPS observations of only 2 epochs in 1999 and 2001, the long term vertical displacement velocities at many regional stations are not reliable. The GPS Observations at the basic stations show that the major characteristics of the long term vertical displacement in China's mainland are as follows: the velocities are low in general with uplift in northern part, subsidence in southern part, relatively intense vertical movement in eastern part and weak vertical movement of small subsidence in western part.