The Tsunami that hit Japan also hit California, see it above rolling into the San Francisco Bay towards Emeryville in the You Tube above. Though much smaller in proportions and diminished strength. This should be looked upon as a de facto warning. Though I am pro-nuclear power as a way of cleaning up both our air and water, I question whether California has any idea what risks the San Onofre nuclear power plant and the El Diablo Canyon nuclear power plant pose? Both practically reside on ocean front property and both are located near earthquake faults.
Though the nuclear explosion in Japan will not by any means be comparable to the Chernobyl accident; (I can provide links as to why), this "black swan" event could easily be duplicated in California and that concerns me.