Not sure but I found this site, I am looking now because you got me thinking ( on a Friday no less ) :-) <A HREF="http://www.geophys.washington.edu/tsunami/intro.html" target="_blank">http://www.geophys.washington.edu/tsunami/intro.html</A> read this <A HREF="http://www.geophys.washington.edu/tsunami/general/mitigation/mitigation.html#land" target="_blank">http://www.geophys.washington.edu/tsunami/general/mitigation/mitigation.html#land</A> jgbuz