Wikipedia has a good article already about the earthquake/tsunami, how it relates to similar disasters, and the country-by-country impact:
2004 Indian Ocean earthquake - Wikipedia, the free encyclopedia
The article also mentions that the first readings indicated a much weaker earthquake, less than 7.0. Apparently different methods are used to calculate very large earthquakes, so it took awhile to get the revised reading. So that explains some of the issues regarding warning, along with the lack of infrastructure.
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