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| | Abstract | | Frequency dependences of near-surface attenuation characteristics based on vertical array records are examined to clarify those physical mechanisms using KiK-net Narita observatory site data. The attenuation characteristics are estimated as a function of frequency by matching the transfer function to the observed spectral ratio using the velocity structures derived from down-hole PS logging profile. Preliminary results show that the frequency dependences of attenuation characteristics can not be explained by the effect of scattering attenuation due to one dimensional velocity structures derived from suspension PS logging profile. There seem to be caused by the ill effects of time domain windows for Fourier transform analysis. |
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