AMPLIFICATION CHARACTERISTICS OF K-NET, KIK-NET, AND JMA SHINDOKEI NETWORK SITES BASED ON THE SPECTRAL INVERSION TECHNIQUE

摘要

To predict strong ground motions for future scenario earthquake in a broad-band frequency range, we need to characterize both source spectra and site amplification. In this study we first try to separate the socalled source spectra, attenuation coefficient, and site amplification factors from K-Net, KiK-net, and JMA records observed throughout Japan. As a reference site we use one rock station of KiK-net. Once we obtain site amplification factors, we try to reproduce them by using one-dimensional S-wave velocity structures below each site. We succeed to reproduce site amplification factors at about one thirds of the sites very well. We then find how to explain site factors as a function of averaged S-wave velocities.