Special Issue (Earthquake Engineering)Technical Report
GROUND AMPLIFICATION CHARACTERISTICS OF VERTICAL MOTIONS DURING STRONG EARTHQUAKES
2023 Volume 79 Issue 13 Article ID: 22-13038
Details
2023 Volume 79 Issue 13 Article ID: 22-13038
Regarding the ground amplification characteristics, vertical motions tend to be less attention as horizontal motions. This is because many structures have been designed mainly considering horizontal motion. However, it is expected that the number of situations in which vertical motions should be adequately considered will increase, since seismic records with large PGA have been measured in recent years. In this study, the strong motion records of the 2018 Hokkaido Eastern Iburi earthquake were focused on and the surface ground amplification characteristics of vertical motions was examined. By comparing the strong and weak ground motion records observed at KiK-net stations, it was shown that the surface ground amplification characteristics of vertical motions differ between the P wave group and the S wave group. In particular, it was found that this tendency appears significantly during strong earthquake.
