Abstract
We investigated 22 broadband teleseismic records of the 1999 Chi-Chi earthquake to determine its temporal and spatial slip distribution. The results show an anomalous large slip region centered about 40 to 50 km north of the hypocenter at a shallow depth. The largest amount of slip was about 6~10 m. The slip near the vicinity of the hypocenter had a relatively smaller amount of slip. The spatial slip distribution pattern coincides well with the observed strong-motion displacement and surface break. In the largest dislocation region, the slip was dominated by dip-slip. Some strike-slip component in the middle of the fault was found during the rupture. The Southern portion of the fault showed relatively constant rupture velocity with an average slip of about 1 m, whereas the northern portion of the fault showed significant variations in rupture velocity and produced a large amount of slip.
Highlights
The 21September1999 (01:47:12) Chi-Chi earthquake (ML =7.3) was one of the most destructive earthquakes in Taiwan during the past 100 years
The largest displacement on surface was nearly 9.8 m, measured at 45 km north of the hypocenter. This complicated surface break possibly indicates the complexity of the rupture process of the earthquake
The strike from the CMT solution was somewhat different from the strike of the observed surface break of the Chelungpu fault with strike of about 3°
Summary
The 21September1999 (01:47:12) Chi-Chi earthquake (ML =7.3) was one of the most destructive earthquakes in Taiwan during the past 100 years. Due to the possibility of complex fault geometry and structure, the inversion of strong motion waveforms dose not readily lead to a quick determination of fault slip distribution This large earthquake was well recorded by teleseismic sta tions worldwide, which provided a good opportunity to quickly determinate fault rupture be havior. In this example, six windows are shown, but the ability to model local variations in particle displacements and rupture delays (rupture velocity variations ) is apparent; rupture can be locally delayed and can vary in duration. With multiple-time window analysis, we can study the more complex charac teristics of a fault rupture, such as variable duration of local slip histories and potential varia tions in rupture velocity
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