Spectral parameters of ground motion in different regions: comparison of empirical models |
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| Authors: | V Sokolov |
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| Institution: | National Centre for Research on Earthquake Engineering, 200, Sec. 3, Hsinhai Rd, Taipei, Taiwan |
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| Abstract: | Fourier-amplitude spectrum is one of the most important parameters describing earthquake ground motion, and it is widely used for strong ground motion prediction and seismic hazard estimation. The relationships between Fourier-acceleration spectra, earthquake magnitude and distance were analysed for different seismic regions (the Caucasus and Taiwan island) on the basis of ground motion recordings of small to moderate (3.5≤ML≤6.5) earthquakes. It has been found that the acceleration spectra of the most significant part of the records, starting from S-wave arrival, can be modelled accurately by the Brune's “ω-squared” point-source model. Parameters of the model are found to be region-dependent. Peak ground accelerations and response spectra for condition of rock sites were calculated using stochastic simulation technique and obtained models of source spectra. The modelled ground-motion parameters are compared with those predicted by recent empirical attenuation relationship for California. |
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| Keywords: | Acceleration spectra Scaling law Attenuation relation Rock sites Stochastic simulation |
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