[BushMeister]

Remember, a tsunami isn't like a normal wave. It's more like a shockwave that is transfered through the water. The water doesn't actually move forward (or rise much) until the shallows are reached. Tsunamis can indeed travel at 400+ MPH.

As to the comparison with the recent huge chunk of ice that broke off from Antarctica: the chunk of ice merely split off from the mainland. It did not plunge from a great height and disturb the volume of the ocean, or create a massive shockwave in the ocean.

[Bikers4Bush]

If we're talking about an earthquake that makes more sense. I just don't buy that the land alone could cause the Tsunami.

I employ the pebble in the pond example. Throw a stone in and the ripples dissipate the further out they get.