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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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โˆ™ 2010-02-27 13:09:53
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