During a scenario earthquake with MW 9.0 along the Nankai Trough, not only strong motion but also huge tsunami is predicted in Suruga Bay area, Shizuoka Prefecture, Japan. Reliable estimation of difficult time during the earthquake in the areas is required to clarify tsunami evacuation. In this study, accuracy of the method to estimate difficult time for tsunami evacuation was investigated quantitatively at permanent station sites for strong motion observation with very high density in the focal area. The results indicates that the methods based on temporary earthquake observation or microtremor measurement in tsunami attack area lead to reliable estimation of difficult times for evacuation.
