This is the video I mentioned in my previous post. It claims to be a "new" video of the Japanese tsunami and I had never seen it before, so I think it really is newly available.

It's rather long at 25 minutes, but it perfectly illustrates how deceptive a tsunami can be. I have no idea where this is but the ocean is nowhere to be seen. A low, calm river slowly but inexorably turns into a monstrous, churning destroyer of everything in its path.