Japan is a country where any kind of natural disaster can happen: tsunamis, earthquakes, typhoons… But they are also very aware of their problem and are “very” prepared in case of danger. For example, after you register in your city hall they give you a a big manual with detailed instructions about what you should do in case of emergency. One of the most important things you have to know is your assigned evacuation area in case you have to leave your home. Around Shinjuku, you can even find the evacuation maps on the streets, here are some of them:
Nishi-Shinjuku evacuation areas.
This is an “interactive” map, where you press the buttons and it shows you the best escape routes.