Regarding tsunami disasters, the literature [7] describes an inundation height greater than 2 m as generating building outflow and human suffering. Securing evacuation facilities is important in areas with a minimum inundation height of 2 m as a short-term countermeasure; this countermeasure is also critical in the case of flooding. From a long-term perspective, the promotion of emigration toward areas with low risk, such as areas with higher ground levels, is important. In areas with a maximum inundation height of 2 m and areas with a significant trend of depopulation and aging, the promotion of emigration is important. In areas without a significant trend, the regulation