| Summary: | 碩士 === 國立成功大學 === 測量工程學系碩博士班 === 91 === The Global Position System (GPS) has been widely applied to monitor the crustal movements for a long time due to its high precision and independence of meteorological conditions. In the thesis, the data of the GPS tracking stations of Taiwan and the international tracking stations of IGPS over the interval August 1999-December 2002 are combined for the computation and analysis of crustal movement and for the establishment of velocity field of GPS tracking stations of Taiwan.
To improve the efficiency of computation, an automatic process based on BPE of the GPS software Bernese v4.2 has been developed. In the daily data processing, the GPS tracking station GUAM of IGS is constrained with its displacement velocity in the network adjustment using Bernese. Our experiment has shown that the inconsistence of reference frame between ephemeris and coordinates of constrained tracking stations can cause a difference up to about 4cm in coordinate. Therefore, that inconsistence cannot be neglected, and is taken into consideration carefully in the thesis.
The results of our experiment have shown that the horizontal velocity of YMSM, PKGM and MZUM tracking stations after 921 earthquake is about 30 ~ 40 mm/yr, FLNM and KDNM about 20 mm/yr, and TMAM about 4 mm/yr . Moreover, all tracking stations of Taiwan descend gradually. YMSM, KDNM, MZUM and TMAM have the vertical displacement velocity less than 10 mm/yr , while PKGM and FLNM have the larger vertical displacement velocity over 20 mm/yr.
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