Wikipedia has a pretty good article explaining how tsunamis propagate across the open ocean and how they transform into a destructive wall of water upon reaching the shore.

Can someone point to more detailed information about how tsunamis move through the ocean, and how they interact with the sea floor? For starters, I understand that the wave itself moves at ~500 MPH in deep water, but how fast and how far does any given particle of water move under these circumstances? I found this reference which gives (on slide 56) a *maximum* horizontal current for a tsunami, in deep water, of just 3 cm/s. Which doesn’t seem like much, but if the water is 1-2 miles deep, and the entire depth of it is shifting at that velocity, then you of course can end up with a very large total volume of water moving toward shore.

Can anyone confirm at least a correct order of magnitude for that?