부산대학교 도서관

During to the 2011 off the Pacific coast of Tohoku Earthquake (the Great East Japan Earthquake) that occurred on March 11, 2011, liquefaction occurred over a large area in the Tohoku and Kanto regions. At present, the areas where liquefactions were identified extend from Aomori Prefecture in the north to Kanagawa Prefecture in the south within approximately 650-km long zone. This earthquake was characterized by the long duration of ground motion with several successive events of the source area. In this paper, firstly we examined the liquefaction occurrence ratio in terms of measured seismic intensities by geomorphologic classification units based on a dataset of strong ground motion data and observation records of liquefaction sites during the 2011 off the Pacific coast of Tohoku Earthquake to show the liquefaction potentials differing between the Tohoku and the Kanto regions. Next, in order to investigate the effect of the ground motion duration, we calculated the real-time seismic intensity and its accumulated index (ΔIs) as explanatory parameters of ground motion intensity. As a result, although it was found that there was still regionality in the Tohoku and the Kanto regions, it clarified that the large ΔIs caused to increase the liquefaction occurrence ratio.