Revealing Surface Deformation of the 1999 Chi-Chi Earthquake Using High-Density Cadastral Control Points in the Taichung Area, Central Taiwan

摘要

The 1999 Chi-Chi earthquake, M_w 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.