Dynamic Surface Response of A Local Area Induced by Chi-Chi Earthquake Using Accelerograph and GPS Solutions

Ching-Shun Ho, Chin-Feng Lee, Jyh-Yih Yu, and Jiunn-Hsyong Tsai

Abstract:	The Chi-Chi earthquake measured 7.6 in magnitude struck Taiwan on September 20, 1999. The Central Weather Bureau (CWB) in Taiwan has been operating an extensive array of more than 800 strong-motion accelerograph stations. A part of the array around the earthquake captured the earthquake sequence. A GPS campaign was performed to survey the permanent surface displacement near the earthquake epicenter. This paper presents the results from analyzing the accelerograph and GPS data from the local area nearby the epicenter. The accelerograph data were integrated to obtain the velocity and position changes during the earthquake. The results show that the GPS and accelerograph solutions agree in magnitude and direction except those from the places close to the Chelungpu Fault. It indicates that the shock wave changed when crossing the fault. The accelerograph results can be used to represent the continuous ground surface motion. The time history shows that the permanent surface deformation caused by the earthquake is occurred in a very short period of time. In the studied area, the magnitude of the deformation can be as high as several meters. The transient position changes are even larger than that.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	1005 - 1010
Cite this article:	Ho, Ching-Shun, Lee, Chin-Feng, Yu, Jyh-Yih, Tsai, Jiunn-Hsyong, "Dynamic Surface Response of A Local Area Induced by Chi-Chi Earthquake Using Accelerograph and GPS Solutions," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 1005-1010.
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