In an attempt to develop possible safe zones for displaced persons during future disasters four main factors have been taken into consideration, tsunami danger zones, terrain, location of major cities, and location/proximity to nuclear power plants. The tsunami danger zones are located along the coast with the highest risk areas being within 3 kilometers of the eastern and southern coastline. Bays and water inlets created by Japans many islands make for areas that are less susceptible to tsunamis. Japans terrain is extremely mountainous making usable land for development and agriculture sparse.
The majority of Japan's major cities are located along the coast and in lower elevation areas. Larger city developments such as the Tokyo and Osaka metro areas are concentrated in coastal regions at the inner most point of bay areas.
Nuclear power plants are also located along the coast due to the need for water in the nuclear power production process. The disaster at Fukushima Daiichi showed that areas with in 30 kilometers are at high risk of unsafe radiation levels in the event of a nuclear disaster. Zones up to 50 kilometers have a moderate risk to humans, while zones up 100 kilometers present risk of soil and food contamination.
The combination of these factors presents a view of areas less likely to be effected by disaster, both natural and nuclear.
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