AMPLIFICATION CHARACTERISTICS OF K-NET, KIK-NET, AND JMASHINDOKEI NETWORK SITESBASED ON THE SPECTRAL INVERSION TECHNIQUE

摘要

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