2009 Volume 65 Issue 1 Pages 118-127
We propose a method to evaluate a site effect using peak ground acceleration (PGA) and predominant frequency of spectrum obtained at local government observation sites where seismic waveform records were not stored. Firstly, the site effects at K-NET, KiK-net observation sites in Kansai region were evaluated by the spectral inversion method. A relationship among amplification factor of PGA and the site effect, bedrock spectrum was derived. As a result, it was clarified that the relationship is valid for the observed records used in this study. In evaluation of the site effect, site effect model in terms of the predominant and first peak frequencies of the spectrum was proposed and the site effect at each observation record was evaluated using the proposed model. In comparison of the evaluated site effects with inverted one, the shape and amplification of the site effects at most observation sites were in good agreement with those of the inverted site effects.
Proceedings of the JSCE Earthquake Engineering Symposium
Environmental systems research
