Slip history and dynamic implications of the 1999 Chi-Chi, Taiwan, earthquake

Chen Ji, Donald V. Helmberger, David J. Wald, Kuo Fong Ma

研究成果: 雜誌貢獻期刊論文同行評審

163 引文 斯高帕斯(Scopus)


We investigate the rupture process of the 1999 Chi-Chi, Taiwan, earthquake using extensive near-source observations, including three-component velocity waveforms at 36 strong motion stations and 119 GPS measurements. A three-plane fault geometry derived from our previous inversion using only static data [Ji et al., 2001] is applied. The slip amplitude, rake angle, rupture initiation time, and risetime function are inverted simultaneously with a recently developed finite fault inverse method that combines a wavelet transform approach with a simulated annealing algorithm [Ji et al., 2002b]. The inversion results are validated by the forward prediction of an independent data set, the teleseismic P and SH ground velocities, with notable agreement. The results show that the total seismic moment release of this earthquake is 2.7 × 1020 N m and that most of the slip occured in a triangular-shaped asperity involving two fault segments, which is consistent with our previous static inversion. The rupture front propagates with an average rupture velocity of ∼2.0 km s-1, and the average slip duration (risetime) is 7.2 s. Several interesting observations related to the temporal evolution of the Chi-Chi earthquake are also investigated, including (1) the strong effect of the sinuous fault plane of the Chelungpu fault on spatial and temporal variations in slip history, (2) the intersection of fault 1 and fault 2 not being a strong impediment to the rupture propagation, and (3 the observation that the peak slip velocity near the surface is, in general, higher than on the deeper portion of the fault plane, as predicted by dynamic modeling.

頁(從 - 到)ESE 5-1 - 5-20
期刊Journal of Geophysical Research: Solid Earth
出版狀態已出版 - 10 9月 2003


深入研究「Slip history and dynamic implications of the 1999 Chi-Chi, Taiwan, earthquake」主題。共同形成了獨特的指紋。