[samwilliams]

I was going to ask for a source for that 40m figure, but I just found it.

That is absolutely terrifying.

Edit: To put in context, even if your were at the top of a ten story building, the wave (and ensuing mass of water) would still reach you.

[rconti]

And if you were at the top of an eleven story building, you'd find yourself without 10 stories to support you!