Originally Posted by
potove
I hope it never happens, but word from my friends in Tokyo is that they have no idea where to go in such cases. A city of 20 million citizen can't exactly all get on trains/planes/bues/cars and leave,... does the government of Tokyo (or the Japanese central government) have a plan(A, B, C, or D)?
Everywhere in Tokyo has a designated disaster evacuation area in which people are supposed to gather. I have no doubt that evacuating to these areas will be the first stage in evacuating the city should that prove to be necessary.
For example, my nearest outdoor evacuation area from home is Shiba Park; at the office, it's Aoyama Park; or Prince Arisugawa Memorial Park if Roppongi-dori cannot be crossed (which I've always assumed to mean that the elevated section of the Shutoko has crashed down).
Your friends can probably contact their local ward office for information if they're genuinely unable to figure this out for themselves.