Research on the Uniformity of Notation Systems of Tsunami Hazard MapsーPresent Situation and Problems of Non-uniformity among Coastal Municipalities Nationwideー

Abstract

ABSTRACT : Tsunami hazard maps provide information for disaster mitigation, such as evacuation sites and estimated depths of inundation. We conducted a survey in Shizuoka Prefecture to determine whether the municipalities in the prefecture use a uniform notation system and found that there is no uniform notation system for tsunami hazard maps. Subsequently, we collected and analyzed tsunami hazard maps from 547 municipalities across the country to confirm whether Shizuoka Prefecture is the only prefecture without a uniform notation system. We found that no uniform notation system exists in the country. In addition, scarcely any prefectures plan to instruct their municipalities to standardize notation conventions for tsunami hazard maps, which are to be developed by each municipality. Taking the above findings into consideration, we discussed necessary measures to standardize notation conventions for hazard maps that were and will be developed in Japan.