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Rupture process of the 1999 Chi-Chi, Taiwan, earthquake from the inversion of teleseismic data



Rupture process of the 1999 Chi-Chi, Taiwan, earthquake from the inversion of teleseismic data



Diqiu Kexue Jikan = TAO, Terrestrial, Atmospheric and Oceanic Sciences 11(3): 591-608



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.

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Accession: 019942984

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