社団法人　物理探査学会
第126回(平成24年度春季)学術講演会

講演要旨(和文) 講演要旨(英文) In many engineering seismological studies such as the spectral separation of source, path, and site effects or source inversions based on observed S-wave records, an appropriate selection of S-wave time windows is required. A 1-D S-wave modeling has also been applied for tuning the S-wave velocity model at a site where strong motion records are available. However, determination of S-wave time windows is an important factor for tuning the deep velocity model of a sedimentary basin. In this study, we compare the synthetic waveforms using a 3-D structure with those using a 1-D structure for shallow and intermediate depth two moderate earthquakes. We adopt the model of the Kanto basin proposed by Yamada and Yamanaka (2011) for this purpose. Based on the waveform comparison between the 3-D and 1-D simulation, we find that the first cycle of the S-waveforms match well at most sites in the period range of 2 to 10s except at those near the basin edges. In general, the waveforms are comparable for a time window of shorter than 10s after the S-wave onset.