Estimation of Site Amplification Factors Using Strong Motion Records of by Hokkaido

Abstract eng:
Site amplification factors at subsurface layers are often used as one of the parameters for estimation of strong ground motion. The site amplification factors influence strongly the ground motion at subsurface layers. For example, waveforms obtained from observation sites are sometimes clearly different even if the observation sites are situated in the vicinity of each other. Therefore, it is assumed that the consideration for the influence of site amplification factors on the ground motion at subsurface layers is important, and improving the accuracy of the site amplification factors contributes towards the technology of earthquake disaster mitigation. The authors investigated the site amplification factors at subsurface layers using strong motion records of Hokkaido. The site amplification factors were estimated by adopting microtopography classification based on the Digital National Land Information. It was found that there were areas which did not show similar tendency of site amplification factors when compared to that obtained by strong motion records of Hokkaido. A more detailed investigation of this issue revealed that the tendency was influenced by regional characteristics, such as alluvial fan. Therefore, detailed areas within the microtopography concentrated were selected, and the regression coefficients for estimation of the site amplification factors were re-determined. The tendency of the site amplification factors estimated by detailed area of the microtopography classification became approximately similar to the site amplification factors obtained by the strong motion records. And the site amplification factor was estimated more precisely by determining regression coefficients in consideration of the regional characteristics.

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