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North Korea's Nuke Test May Have Been Twice as Strong as Thought

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How U.S.-North Korea Tension Could Lead to War

North Korea’s latest nuclear test may have been more than twice as powerful as first thought -- or 17 times stronger than the Hiroshima bomb -- according to an analysis by 38 North.

New seismic data from the Sept. 3 explosion suggest a blast of about 250 kilotons, compared with an initial estimate of 120 kilotons, analysts Frank Pabian, Joseph Bermudez Jr. and Jack Liu wrote for the website, which is run by the U.S.-Korea Institute at Johns Hopkins University’s School of Advanced International Studies. The energy released by the U.S. bomb detonated over Hiroshima in 1945 was about 15 kilotons.