Present-day Crustal Deformation In China And GPS-derived Coordinate Time Series Analysis

The establishment of the IGS (International GPS Service for Geodynamics), which was set up in the end of last centure,was a symbol for the beginning of geodynamics research by using GPS data. From that time,many GPS continuous observation networks were carried out by variousorganizations. At the end of the 2001, 1800 GPS continuous observation stations had being operated routinely. In China, 25 GPS fiducial sites, 1000 regular observation base network and irregular observation regional network stations were established bythe main scientific project named.Crustal Movement Observation Network of China.. The data collected by these networks become a foundation for geodynamics. At the first part of this thesis, the so-called China plate and the present-day crustal deformation in China are mainly discussed. The paper show a bug of an inconsistent with theorientation definition of theterrestrial referece frame in the ITRF combinations, to resolve this bug, a condition equation is set up. As a by-production, the global plate motion model isconsistent with the geological model (NNR-NUVEL1A) basically. But there are different in some regions, these differences are the motionaldiscrepanciesbetween an average of millions of year and year-scale crustal deformations. The ITRF global plate motion model, which is served as a background, is suitable for year-scale crustal deformation research. Moreover, the up-to-date data of GPS networks in China have been processed, the velocity fields, which is thedensest (over 1000 sites) and the mostprecise (better than 2mm/a) in China, have been obtained. The deformation state under China Plate is given. At the second part of the thesis, we use spectral analysis and multi-resolution wavelet analysis to study GPS time series in height component generated from continuously operating stations, which are globally distributed, and separate stationary signals from the non-stationary and set up discrete models of stationary height signals by usingAR model methods. Comparisons made in this paper show that the correlative length of GPS time series in height component varies from 2 days to 31 days, rectifying the integral deficiency from zero in random walk process. After analyzing, both annual and biannual vibrations of integrated expanding and contracting movement in the Earth are detected. The biannual maximum value is found in Mar-Apr and Oct-Nov while the annual maximum value is in Sep-Nov. 5 上海天文台博士学位论文 中国大陆现今地壳形变与GPS坐标时间序列分析 Meantime; we observe that the movements follow different laws in the Northern and Southern Hemisphere. The Southern Hemisphere is expanding compared with the Northern.The initial qualitative analysis of geophysics for theseasonalvariations in GPS time series and the fatherinvestigation problems are given. The contents of the first part of thearticle have been published in《Journal of Geodesy》 (2002) and 《Chinese Journal of Geophysics》 (2002).Chapter 2, chapter 4 and chapter 5 of the article had been accepted by《Science in China》(Series D) respectively.