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