One might note the two other major events with nuclear plants, Three Mile Island and Chernobyl, were not in a sequelae to earthquakes or tsunamis.
In my opinion, the radiation plums from Japan are NOW over fisheries with weather persciptation and this is more than a serious accident, Level Six. There are multiple reactors at varying stages of 'deterioration' and there are significant structural damages. It's a seven, though no fault of the Japanese and their scientists.
