How Scientists Know the North Korea Blast Probably Wasn't an H-Bomb

It's too similar to earlier explosions.

Earnest: Analysis Not Consistent With North Korea Claims

National security experts were quick to express doubt about North Korea's claim that it tested its first hydrogen bomb on Wednesday. This chart explains why: The seismic effects of the explosion are too similar to previous explosions, in 2013, 2009, and 2006, which were all confirmed as underground nuclear tests. A true hydrogen bomb would have caused a larger seismic reading.

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