Tuesday 23 August 2005

G3

PT0048
Prominent afterslip displacements of the 10 December 2003 (MW 6.5) Chengkung, eastern Taiwan, earthquake
Chen, Horng-Yue¹, Yu, Shui-Beih¹, Kuo, Long-Chen¹
1 Institute Of Earth Sciences, Taipei, Taiwan
Author email: chenhy@earth.sinica.edu.tw
The MW 6.5 Chengkung earthquake occurred at 04:38 UTC on 10 December 2003. Eighteen continuously recording GPS stations (CORS) have been set up at different geological sites and distributed throughout a 50 km by 20 km area in southeastern Taiwan beginning in 2000. The GPS data is recorded daily for the CORS in 30 seconds sampling rate. These GPS data are utilized to study the coseismic and postseismic deformation associated with the Chengkung earthquake. The CORS near the Chihshan fault, which are located at the southern segment of the Longitudinal Valley Fault, indicated the largest afterslip displacement in one year approached 115 mm and 85 mm in the horizontal and vertical components, respectively. The results of the CORS provide detailed information for the temporal process of postseismic deformation. The coordinates of the daily solution for each station were extracted from SINEX (Software Idependent Exchange) files to establish time series in the topocentric north-east-up (NEU) coordinate system. The secular crustal deformation of the station during the one year period was removed by applying the 2000-2003 interseismic velocities.

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