The following video is an extraordinarily easy to understand representation of just how powerful the March 11, 2011 earthquake to strike off the Tohoku Region of Japan was. Seriously, not to deprecate the Chile earthquake of 2010, or the huge tsunami and earthquake to hit Indonesia in 2004. But this video shows just how hard an earthquake of that size hits ANYWHERE, not just Japan.
For best effect, put on some headphones, and crank the bass wayyyyyy up...
For a more global view, check it out here.