Abstract
A total of ninety-nine GPS control sites were measured by GPS after the 1999 Chi-Chi earthquake (Mw=7.6) occurred in Central Taiwan, in order to estimate the surface displacements and provide a ‘new’ coordinate data setfor government to carry on the re-conslruction scheme in the damaged area. GPS data observed at these sites were processed, and the network solutions showed the coordinate accuracy to be of 3 – 4 cm in horizontal components. The coordinate data was also compared with that measured before the earthquake to investigate the displacements. The estimates showed horizontal displacements of 0.1 m to 8.5 m for the sites observed. It was alsofound that significant displacements extended along the Chelungpu active fault, where a fault trace ruptured at the earthquake has been clearly seen.
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