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It depends on the depth. On deep oceans it can hit 500 mph. Near the land it slows down to 20 or 30 mph.

http://www.publicaffairs.noaa.gov/grounders/tsunamis.html

It is important to note that the 500 mph is simply a theory, there is no method to truly measure the speed of the wave. Also, if you follow the above link it explains that when the tsunami approaches any land it slows to 20-30 mph. This would even further refute the 500 mph.

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yes they do and there strong

Another Answer

Thanks to Glenn Elert's online Physics Fact Book:

"The maximim for the Gulf Stream is 2.5 meters per second on the surface and 0.02-0.10 meters per second in deep water."

Read more, below.

Tidal currents move at 1 knot... which is equal to 1.15 miles per hour....

In deep ocean water, a tsunami can move at about 500 mph. When they get into shallow water they slow to 50 mph ot less.

Q: How fast do tidal currents move?

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