2024 Volume 80 Issue 13 Article ID: 23-13117
In order to clarify the relationship between the horizontal seismic intensity, Kh, and the peak ground acceleration, PGA, on the slope damaged by the 2018 Hokkaido Eastern Iburi Earthquake, Kh were backcalculated. The safety factor of the slopes when back-calculating Kh was set to Fs =1.0. The ground properties of the slip surface used in the back-calculation of Kh were established based on previous investigations, and two cases with relatively strong and weak ground properties were used to verify the influence of the variation in the ground properties. PGA was calculated by the Shi Midorikawa attenuation relationships. Kh was calculated by 3D stability analysis, considering the actual collapse geometry. From these calculated values, equations relating Kh to PGA was obtained. Kh obtained from this relationship. The obtained Kh was compared with the practically used Kh. As a result, it was found that, when weak ground properties are used in the present study area, Kh calculated by the Noda et al. equation gives a more reasonable value for the Kh during a large-scale earthquake than other methods used in practice.
