I think it needs a clarification.. As a gamer, a map is basically the virtual place where you play and quake is a famous shooter game. So, basically, I thought that "japan quake map" was a map for the quake game.

It, by no means, was an insult/bad joke about the current situation in Japan as we all know how terrible it is.

Here's an explanation of the quake's inverse square rule describing the relationship of the force experienced to the distance away from it: http://news.ycombinator.com/item?id=2332793