Abstract
The kinematics rupture process of the Chia-Yi earthquake occurred on October 22, 1999 (Mw 5.9) in Taiwan is investigated. The hybrid blind deconvolution technique is applied to the teleseismic waves to invert source parameters, including slip amplitudes, rise times and rupture velocities on the fault. From the directivity effect of the fault, the actual fault plane is determined as east dipping. According to the derived ASFT, the total duration of the rupture process is 6.5 sec. A good correlation notices that the larger slip amplitude corresponds to the longer rise time of the subfault. By using the inverted source parameters and combining the stochastic method for finite fault, the strong ground motions of 12 stations at epicentral distances ranging from 3.28 to 29 km are simulated. The results show that the agreements between simulated and recorded spectra are quite satisfying. It means that the inverted source parameters are reliable and the stations where located at near source distance are dominated by source effects. The inhomogeneous distribution of slip and the variable corner frequency could play important roles in the simulation process. Although the source effects are dominant, there are some significant discrepancies existing at stations, implying the site effects are influential.
Highlights
On 22 October 1999, at 02:19:0.4 GMT, a strong earthquake of ML=6.4 occurred in the Chia-Yi city near the south of the Chelungpu fault in Taiwan
Chia-Yi Taiwan Earthquake from Teleseismic Data Using the Hybrid Blind Deconvolution Method In Figure 11~13 we present the results of the stochastic simulations and their comparisons with the observed strong ground-motion recordings
We apply the hybrid blind deocnvolution method to derive the temporal-spatial rupture process of the ML 6.4 earthquake which occurred on the Chia-Yi, Taiwan, on October 22, 1999
Summary
On 22 October 1999, at 02:19:0.4 GMT, a strong earthquake of ML=6.4 occurred in the Chia-Yi city near the south of the Chelungpu fault in Taiwan. The event is the larger aftershock of the Chi-Chi earthquake (Mw= 7.6). The Chi-Chi earthquake which ruptured along the Chelungpu fault was the largest earthquake to strike Taiwan in the twentieth century. The Chia-Yi earthquake occurred on a basement-involved reserve fault under western plain. In the fact-finding, the event caused at least 12 buildings to collapse in Chia-Yi city [1]. It offers a valuable example of the potential destructiveness of moderate-magnitude earthquake when it occurred in the proximity of densely populated areas
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