A 5.1 magnitude quake was detected about 30 miles from North Korea’s Punggye-Ri nuclear test site this evening, indicating a possible underground nuclear detonation. North Korea’s last nuclear test was in 2013 and the detonation resulted in a quake measuring 5.1 magnitude with an estimated weapons yield between six and nine kilotons. The bomb dropped on Hiroshima was a 15 kiloton weapon by comparison. Update: North Korea says it has detonated its first hydrogen bomb.
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