Preliminary GPS Solutions in Measuring Surface Deformation Caused by 1999 Chi-Chi Earthquake

Ching-Shun Ho, Chin-Tang Weng, Chi-Ching Liu and Jiunn-Hsyong Tsai

Abstract:	A huge earthquake measured 7.6 in magnitude struck Taiwan on September 20, 1999 and claimed more than 2,400 lives. A GPS continuous tracking network with 15 sites was in operation to collect data before and after the earthquake. This paper presents the results from analyzing the data set. The daily solutions clearly show that a 40-cm surface displacement close to the epicenter can be found. If the data span is reduced to two hours, the time series of two-hour solutions indicate that a pre-seismic surface motion can be detected in this event. This study also presents an approach of using two-hour data that is updated every 15 minutes. The approach allows that the solution epoch is as close to the earthquake epoch as possible. As a result, the new two-hour solutions are in 15-minute interval. The surface motion still can be found in these particular two-hour solutions. The estimated motion is ahead of two-hour solutions by at least one hour. The detection of pre- and post-seismic surface motions is possible with using GPS technique.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	296 - 300
Cite this article:	Ho, Ching-Shun, Weng, Chin-Tang, Liu, Chi-Ching, Tsai, Jiunn-Hsyong, "Preliminary GPS Solutions in Measuring Surface Deformation Caused by 1999 Chi-Chi Earthquake," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 296-300.
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