Risk Evaluation of Tsunami Evacuation Based on the Supposition of Level 2 Tsunami and Questionnaire on the Citizens in Kamisu City, Ibaraki Prefecture

Abstract

In order to evaluate tsunami evacuation risk in Kamisu city, we conducted questionnaire survey on all households belonged to neighborhood associations in the city and spatial analyses using the data of submergences by the level 2 tsunami which was supposed by Ibaraki prefectural authorities. Based on the survey data, the citizens' characteristics of tsunami evacuation action were grasped. And, by using GIS, evacuation routes that might be wholly or partly inundated were identified to measure distances of the sections. Then, we estimated time series transition of a number of evacuees who had not escaped from the submerged area, and examined the effects by improving percentages of evacuation and immediately start and evacuation routes.