Abstract
In this paper, we analyzed the effect of the qualitative tsunami warning. Generally, it can be said that most of people desire that somebody, such as some competent administrative body, declare how big, when and where the next great tsunami will occur. On the other hand, the operation rules of the tsunami warning was changed from the quantitative expression to the qualitative expression by the Japan Meteorological Agency in March 2013. It seems that the above qualitative tsunami warning is the opposite of the above public feeling. Therefore, it is supposed that many people will show a negative reaction to this revision of the tsunami warning, and that the risk communication regarding with the tsunami warning between the public and the government broke down.
As a result of the verification by using a questionnaire survey, it became clear that the above assumption is correct, and that the qualitative tsunami warning is more effective in facilitation of rapid evacuation behavior than the quantitative tsunami warning.
