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Evaluation of models for Fourier amplitude spectra for the Taiwan region

✍ Scribed by Vladimir Sokolov; Chin-Hsiung Loh; Kuo-Liang Wen

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
447 KB
Volume
22
Category
Article
ISSN
0267-7261

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✦ Synopsis

In the Taiwan region, the empirical spectral models for estimating ground-motion parameters were obtained recently on the basis of recordings of small to moderate (5.0 # M L # 6.5) earthquakes. A large collection of acceleration records from the M L ΒΌ 7:3 Chi-Chi earthquake (21 September, 1999) makes it possible to test the applicability of the established relationships in the case of larger events. The comparison of ground-motion parameters (Fourier amplitude spectra, peak accelerations and response spectra), which were calculated using the models, and the observed data demonstrates that the models could provide an accurate prediction for the case of the Chi-Chi earthquake and the largest aftershocks. However, there are some peculiarities in the ground-motion frequency content and attenuation that, most probably, are caused by the features of the rupture process of the large shallow earthquake source.

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