Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 2006; v. 96; no. 6; p. 2431-2440; DOI: 10.1785/0120060055
© 2006 Seismological Society of America
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Revealing Surface Deformation of the 1999 Chi-Chi Earthquake Using High-Density Cadastral Control Points in the Taichung Area, Central Taiwan

Yuan-Hsi Lee1, He-Shin Chen2,3, Ruey-Juin Rau3, Chien-Liang Chen4 and Pen-Shan Hung5

1 Department of Earth and Environmental Sciences
National Chung-Cheng University
168 University Road
San-Hsing, Min-Hsiung Chia-Yi
Taiwan, Republic of China
seilee;caeq.ccu.edu.tw
 (Y.-H.L.)
2 Land Survey Bureau, Ministry of Interior Taiwan
4F, No. 497, Sec2, Liming Road
Nantun District, Taichung City, 408
Taiwan, Republic of China
lsb23012;camail.lsb.gov.tw
 (H.-S.C.)
3 Department of Earth Sciences
National Cheng Kung University
No. 1 University Road
Tainan City 701
Taiwan, Republic of China
raurj;camail.ncku.edu.tw
 (R.-J.R.)
4 Center Geological Survey, MOEA Taiwan
P.O. Box 968, Taipei
Taiwan, Republic of China
surveydo;calinx.moeacgs.gov.tw
 (C.-L.C.)
5 Department of Land Management
Feng-Chia University
No. 100 Wenhwa Road
Seatwen, Taichung
Taiwan 40724, Republic of China
pshung;cafcu.edu.tw
 (P.-S.H.)

The 1999 Chi-Chi earthquake, Mw 7.6, ruptured a major thrust fault along the western foothills of the Central Mountain Range of Taiwan. Here, we use cadastral control points to detect horizontal displacement in Taichung, central Taiwan. The cadastral control points were used to identify the coordinates of buildings and acreage. The coordinates of each point are measured by total station and connected to Global Positioning System (GPS) control points. The density of these control points is nearly 36 points/km2 and the accuracy of each point is within less than 2–3 cm.

The government of Taiwan measured cadastral control points before and after the Chi-Chi earthquake in the Taichung area (northern end of the Chelungpu fault); 1269 control points were measured over a 35-km2 area with most control points being located on the hanging wall of the Chelungpu fault. On the footwall, the displacement is about 1.1–1.2 m toward 123° to 128°, which is consistent with GPS data. At the hanging wall, the displacement direction concentrates at 326° to 330°. In the eastern section, the displacement is from 7.5 to 8 m, which is consistent with GPS and strong- motion data, but in the western part displacement changes from 8 m to 4–6 m and then increases again to 8 m along the 326° trending. We conclude that the changes in displacements were controlled by the geometry of the fault plane.

Online material: Horizontal displacement of cadastral control points.






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