Not mentioned in the article but related, Japan has a rich history of "tsunami stones" that mark points below which it's unsafe to build. http://www.nytimes.co

Not mentioned in the article but related, Japan has a rich history of "tsunami stones" that mark points below which it's unsafe to build. http://www.nytimes.com/2011/04/21/world/asia/21stones.html http://www.nytimes.com/2011/04/21/world/asia/21stones.html