We have determined approximate average rates of deformation in the Qinghai-Tibet plateau and its margins from the GPS data for last 10 years and the moment tensors from earthquakes between 1900 and 1999. We also determined the strain rate (seismic strain rate) associated with the seismic deformation using 254 Mw≥5.0 earthquakes, and estimated the shortening and extension rates for every block in the area as well. We also estimated the strain rate (geodetic strain rate) by 80 GPS sites' velocity vectors and analyzed characteristic of kinematics by two kinds of strain rates and discussed earthquake potential in the area. As a result, the deformation rates from seismic moment tensors and from GPS velocities are basically agreed with each other. It is feasi-ble to analyze seismic risk by comparing geodetic strain rate with seismic strain rate based on the opinion that strain energy will be released through earthquake. It is concluded that there is no strong earthquake potential (>M7) in the Qinghai Tibet plateau and its margins, but there is earthquake potential (>M5) in middle Tibet in a few years.

of the Tibet block relative to Golmud in the north and south directions is (9.3±4.6)mm/a, the strain velocity of the middle part in the west and east directions is (15.6±6.3)mm/a, reflecting the plateau lateral extruding movement. The Himalayan block is mainly compressing strain, and the middle part of the Tibet block is mainly extending strain. The highest extending and the compressing strain are 0.131×10−6/a and −0.189×10−6/a, respectively.

Wuhan Technical University Surveying and Mapping (WTUSM) carried out three GPS campaigns in the Tibetan Plateau since 1993. To improve the vertical component precision of GPS measurement, we estimated the remaining tropospheric refraction using the piecewise linear method after the SAASTAMOINEN model and corrected the tropospheric refraction by selecting one parameter for every two hours model to consider the variation of tropospheric refraction. Using the IGS combined ephemeris and corresponding EOP Series for 1995 and 1997 GPS campaigns, all baseline vectors were processed by GAMIT (Ver.9.71) software, and network adjustment was carried out in ITRF97 frame by PowerAdj software (Ver.3.3) which was developed by WTUSM considering the baseline vectors'full covariance matrix. The resulting vertical velocity field determined from GPS campaigns in 1995 and 1997 shows that the average uplift rate in ITRF 97 frame is about 7.8

Global Positioning System (GPS) observations from three measurement campaigns from 1995 to 1999 are used in a study of the tectonic activity and earthquake hazards in North China. These GPS data were firstly processed together with about 13 Global IGS stations using the GAMIT software to get the baseline solutions, then crustal horizontal motion in ITRF97 frame and with respect to Eurasia were obtained based on these baseline solutions and their variance-covariance matrix using the GPS network adjustment software Power ADJ developed by Wuhan University. Using the GPS velocity field we estimate the annual accumulation of strain rate field and annual accumulation of density of strain energy field. These resulting fields show the following: (1) most stations move at a rate of (3-12mm/a)

综述了10多年来国内外大地测量反演问题研究的成果及最新进展，特别是大地测量联合反演模型、大地测量联合反演算法以及大地测量联合反演理论和方法在研究地壳运动、地球构造等中的应用成果，讨论了联合卫星测高、声纳测深及海洋激光雷达遥感信息反演海洋环境参量，联合INSAR、GPS和水准资料反演研究地壳运动和联合各种观测数据反演研究地球内部构造问题。随着科学技术的发展，大地测量联合反演理论和方法研究将在监测全球变化、防灾减灾、发展地球科学理论方面取得更大进展。