8.9 Magnitude Earthquake Hits Japan + Tsunami and Alerts

Wow, 3700 millisieverts? Are you sure you don't need to double-check that source? I'm pretty sure we haven't heard anything about radiation anywhere rising TO 3700 in the first place, unless I've missed something in the last hour, I'll be back after I see if I can dig up something.

Half the population starts dying at 2500 sieverts/hr, 4000 would assure a 99% death rate on the spot.

Its quite possible because those are measurements only within the plant. Most measurements I've seen are for outside the plant.
And such high numbers would explain why we have this picture and why workers cant get near the plant:

Overwhelmed: Tokyo Electric Power Company Managing Director Akio Komiri cries as he leaves after a press conference in Fukushima

edit: just to add one last claim

Nuclear experts have been saying for days that Japan was underplaying the crisis' severity.