[brucecw]

The biggest problem with a tsunami as a surprise weapon would be that it's difficult to set it up as a surprise. You need some kind of massive movement of earth or water in order to set one up; this is going to be hard to hide. So you'd almost certainly have some hours of warning that one was coming - enough to save a lot of lives but not to save property.

Bruce

[JustPiper]

Can't a nuke in the ocean cause one?

[Domestic Church]

"The biggest problem with a tsunami.... difficult to set it up as a surprise.

If it happened at one AM eastern time it would be a surprise.