The Big Island has a lot of big earthquakes. There was a 7.2 in 1975 that caused a local tsunami that actually killed people, and there was a 6.6 in 1983.
Thanks. Man, I've always thought of Hawaii as a perfectly safe place to live, as far as natural disaters go (except for the occasional tsumani). Jeez, I learn something every day -- even when I'm not trying! :-)