You may find it interesting that us dumb Americans have also built atomic power plants in seismic active areas...
Here in the US we have the San Onofre and Diablo Canyon Reactors with similar seismic exposure...
Diablo is not in the ring of fire, and its not in a position for backup power to be flooded [DUH! in japanese] And Diablo was stopped for 3 years for the most intensive seismic upgrades ever made.
If you can make a power plant that operates on a ship in a typhoon, you can make the same model for use on land
And if anyone had a brain 40 years ago, and I believe a few did, all the plants would operate in FAIL SAFE mode with passive cooling, irregardless of a power supply or a drunken operator.
But then the pump makers would'nt have made much money on the plants construction.
Funny how every city in America has a water tower up 100 feet in the air with a few hundred thousand gallons of water in it for relatively non-safety related issues. But the Japanese couldnt afford to put a few next to each reactor?
HEY! Just in from Japanese news central: "We discova Dodge floor mat got stuck under the nuclear accelerator pedal!!" And "we no design-a the hokey pokey electronics! .... Amelican General Electric designer told us put genalator on beach!!! So we had to put old fuel lods ona roof, shaking building apart in earthquake - plobably cause by Amelican drill rigs in Alaska. "
And all horseplay aside, no humans should face this three punch knockout they have suffered. If these plants melt down, japan will lose about half of its real estate. At least we have places to move people to.