Predicted results of the velocity structure at the target site of the blind prediction exercise from microtremors and surface wave method as Step-1, Report for the experiments for the 6th international symposium on effects of surface geology on seismic motion

Abstract 1D velocity profiles at a strong motion station in the northern part of Kumamoto plain, Japan, were submitted Step-1 blind prediction exercise ground motions sixth international symposium on effects surface geology seismic (ESG6). Individual participants requested to estimate S-wave profile sedimentary layers from given data obtained by microtremor array explorations and surface-wave site. This paper reports target site, methods used individual participants, results. More than half estimated phase velocities Rayleigh-wave frequency range 0.53 29.8 Hz. The statistical analysis dispersion curves indicates that standard deviation was below 40 m/s frequencies above 3.4 Hz, it 20 are also similar depth m. 45 m/s. average top 30 m is 207.3 ± 60.7 for profiles. large variation related introduction near-surface low layers. found deep part. 1500 2674 with 786 We compared amplifications Common peaks can be identified 0.3–0.4 Hz 1–2 excluding two teams. However, vary much higher 4 Through experiment, shallow structures among participants. Further development techniques profiling required. Graphical