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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: combjelly who wrote (215301)	1/18/2005 1:13:55 PM
From: tejek	Respond to of 1573895

"Someone just said that a tsunami can last hours......." Most tsunamis are the result of some sort of displacement in the sea floor. That is roughly equivalent to dropping a pebble in a pond. When you do something like that, you don't just get a single wave, you get a series of waves of decreasing amplitude. In addition, tsunami waves have a very long wavelength, so those waves are spaced out at a distance of up to 200 km. Here is a good description of the whole process. tulane.edu So how long a tsunami lasts is sort of dependent on what you want to classify as a tsunami. There are going to be shock related waves for a long while, but most of them aren't going to be very significant in size. Thanks for the info. Some people who were in Sri Lanka were saying that the second wave hit roughly 2-3 hours after the first one. It didn't make sense to me. I didn't realized that there could be upwards of 500 kilometers between waves. Apparently, that kind of spacing occurred with this tsunami. No wonder the destruction was so bad. I had thought it was just one wave. From videos, the size of the wave did not seem that impressive for it to result in the kind of destruction we saw. Now I understand better why the damage was so extensive. Thanks again. ted