Abstract
AbstractTaiwan, a seismic active island has been struck by numerous earthquakes in the past. The 1999 Chi-Chi earthquake was one of the deadliest to occur in the 20th century. The ground motion caused a surface rupture of roughly 100 km along the north–south Chelungpu fault, with surface displacements of up to 12 m. The ground motions were recorded at over 400 stations across the island. In this paper, frequency domain analysis using fast Fourier transforms (FFTs) and continuous wavelet transforms (CWTs) for near field ground motions were performed to examine the change in ground motion frequencies with time. Directivity effect is imputed to the near field waves, which cause significant changes to dynamic response of structures. Important ground motion parameters are analyzed and CWTs are used to identify the damage potential of selected near field ground motions.KeywordsFrequency domainFast fourier transformNear-fieldTaiwanContinuous wavelet transform
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