There really was an explosion, just not a meltdown.
That last map image is also a real "estimate" (a what if type of thing), but the situation still appears to be under control. Main containment is still intact and that's what really matters. They've started pumping seawater (not sure exactly when that happened) to cool down the reactor, which should take 5-10 hours. Radiation levels have apparently dropped a bit and some cooling has occured, though they're not out of the woods quite just yet. We'll have to get more updates throughout the day. News sources say they've escaped by a narrow margin on this one.