Did they shut down the reactors at least?
The reactors shut down automatically in case of an earthquake.
The problem here seems to be that water leaked out of the cooling system, and the core gets too hot.
They fear a meltdown, the explosion that happened was when they let off steam to lower the pressure on the core, the H2O split up and exploded.
For now the core seems to be stable and the radiation is lowered, but i don't know if that can hold.