HR: 14:10h
AN: T33E-03    [Abstracts]
TI: Surface deformation of the 1999 Chi-Chi earthquake using the high density cadastral controlling points in Taichung area, Central Taiwan.
AU: * Lee, Y
EM: seilee@eq.ccu.edu.tw
AU: Chen, H
EM: lsb23012@mail.lsb.gov.tw
AF: He-shin Chen, No.1, Ta-Hsueh Road, Tainan, 701 Taiwan
AU: Rau, R
EM: raurj@mail.ncku.edu.tw
AF: Ruey-Juin Rau, No.1, Ta-Hsueh Road, Tainan, 701 Taiwan
AU: Chen, C
EM: surveydo@moeacgs.gov.tw
AF: Chien-Liang Chen, 2, Lane 109, Hua-Hsin Street, Chung-Ho, Taipei, 235 Taiwan
AB: The cadastral controlling points were used to identify the coordinate of buildings or acres. The coordinate of each point is measured by total station and connected to GPS controlling points. This density of these controlling points is more than 40 points/km2 and the accuracy of each point is less than 3 cm. The high quality and quantity controlling point­Ýs data could afford detail deformation information during big earthquake. In Taichung area, which located on northern part of the Chelungpu fault, government measured the cadastral controlling points before and after the Chi-Chi earthquake and there were 1334 controlling points were measured in 35 km2 and most of these controlling points are located on hanging wall of the Chelungpu fault. In the footwall, the displacement is about 1.1~1.2 m in 123 to 128 degree which is consistent with the GPS data. In the hanging wall, the displacement direction is concentrate on 326 to 330 degree instead of the southwestern part which is at 310 degree. In eastern part, the displacement amount is from 7.5~ 8 m which consistent with the GPS and strong motion data, but in western part the displacement amount changes from 8 m to 4~6 m and then increases to 8 m again along the 326 degree trending. The changing of these displacements was controlled by geometry of fault plane.
DE: 1204 Control surveys
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 8118 Dynamics and mechanics of faulting (8004)
SC: Tectonophysics [T]
MN: Fall Meeting 2005