2020 Volume 76 Issue 2 Pages I_935-I_940
In present study, tsunami risk assessment in Niigata urban area was conducted by using numerical modelling of tsunami hazards associated with Niigata earthquake (1964). Tsunami inundation simulations considering uncertainty with regard to fault model and slip amounts provide an estimate of flooded area and affected people in the present ground elevation. According to the results of the simulations, the total inundated area is nearly 6.6 ~ 15.3 km2 and roughly 27 ~ 81 thousands people are directly affected by tsunami inundation in the case where uncertainty related to four fault models was included into the simulations. In addition, inundation area increases as 12.3 ~ 28.7 km2 and the amount of the affected ranges from 47 to 127 thousands in the case where the slip amount was added by 4.5 m on the fault models. As a summary, it can be said that the current Niigata urban area is highly vulnerable to tsunami hazards caused by the fault models of Niigata earthquake.
