Abstract
It is difficult to evaluate site amplification factor analytically because site amplification factor is affected by several factors such as three dimensional deep subsurface profile. Site amplification factors have been evaluated by spectral inversion using strong motion records in the previous study. Therfore, site amplification factor has not been evaluated precisely at sites without strong motion observation.
In this study, site amplification factors at several strong motion observation points in Kyoto basin were evaluated by three dimensional finite difference analysis by modeling deep subsurface profile. Site amplification factors obtained by analysis were compared with those by spectral inversion and accuracy of the results by analysis was discussed. It was shown that the site amplification factor was evaluated more precicely by using both analytical site amplification factor and empirical site amplification factor. In addition, new evaluation method of the site amplification factor in the range up to 6Hz was proposed. Applicability of the proposed method was discussed.
