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| | Abstract | | Microtremor array observations were carried out in the coastal area of Kuji City, Iwate Prefecture in order to estimate shallow underground S-wave velocity structures from microtremor H / V and phase velocity data. The site amplification factor from the engineering bedrock based on an average S-wave velocity was evaluated. Then, the SH wave amplification as a function of frequency of was also calculated by using the S-wave velocity structure model. The results are shown as follows: Surface S-wave velocity wss very slow and about 100m/s. The estimated structure in Kuji City indicated the bowl-shape. The amplification factors obtained from observations were larger than the site amplification factor of J-SHIS. The amplification characteristics of the SH wave showed that the maximum of the amplification factor was six times at a frequency of 1 Hz. |
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