2025 Volume 25 Issue 7 Pages 7_20-7_37
When earthquakes occur, running trains are quickly suspended if necessary and facilities are inspected based on the observed earthquake ground motions by seismometers installed along the railway. Addition to the discrete observed motions by the seismometers, continuous estimated motions along the railway are useful to determine the optimal inspection section. Although the estimated motions inevitably include estimation errors, the practical use of estimated motions has not progressed sufficiently because the handling of estimation errors has not been established. Therefore Iwata et al. (2023) proposed a practical method to estimate fused observed and estimated motions, after presenting the concept of handling the estimation errors. The method proposes distances to apply observations as a uniform. However, the distance should be established individually according to the degree of change in the subsurface ground amplification characteristics around the observation site. In this study, we propose the concept of the distances to apply observations using the spatial seismic amplification characteristics of subsurface ground by public institutes. Furthermore, we show an example of estimated motions using the proposed method for a virtual railway.
