The tectonic plates of the earth are floating on magma, they hold up our land and water masses. The magma surrounds a liquid center (earth's core), spinning under incredible pressure and heat. If any of the six generators in cooling towers, one through six, enters into full melt down, it will soon burn through the containment vessel and then through the power plant itself. Should there be enough nuclear material to allow for a sustained fission reaction, it could conceivably burn a path to the earth's core.
The contents of the earth's core would then forcibly eject itself out of the shaft the burning nuclear material formed on the way down from its power plant. This would create two events; the earth would slowly stop spinning but more importantly the liquid iron of the earth core would act as a "rocket engine" and push the earth either into the sun or out of orbit into the cold night of space.
or just a testimony of my inadequate/misguided/ignorant understanding of geology, chemistry and physics.
Just wanted to be silly for a moment to take a quick step back from an event so horrific and sorrowful that it is simply beyond my understanding.
Do what you can (money, time, skill, labor) and pray for our brothers and sisters in Japan.
Fear and trembling have beset me; horror has overwhelmed me.