Very Good Article, Marcia
I recommend all Zoners to have a good read through Marcia's linked piece, and follow-up on the links in that in turn.
In particular, there is a really good pdf (15.7 MB !) near the end "Surviving a Tsunami".
I think one of the best things that could be done is to update this document with some local examples from the recent tsunami and translate it into Tamil, Thai, Bahasa, and various other languages, and distribute it to coastal villages and towns around the Indian ocean.
Come to that, all coastal districts worldwide probably need a copy!