INUNDATION RISK EVALUATION AGAINST UNINTENDED TSUNAMI MAGNITUDES VARIATION IN THE WAKAYAMA PREFECTURE

Abstract

 Next future Tokai-Tonankai-Nankai earthquake is predicted by the Headquarters for Earthquake Research Promotion with a high probability of more than 60%. This study has evaluated the inundation risk against various tsunami magnitudes over the estimated tsunami source by the Central Disaster Prevention Council. In the Wakayama Prefecture, variation of tsunami-induced inundation areas and heights depends on each area's topography. Inundation risks in the middle and south areas gradually increase with the increase of tsunami magnitude, while the inundation risks in the north low-lying areas increase drastically.