2017 North Korean nuclear test

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North Korea conducted its sixth (and most recent to date) nuclear test on 3 September 2017, claiming it had tested a thermonuclear weapon (hydrogen bomb). While unconfirmed, analysts agree the test was likely of a thermonuclear or boosted fission weapon. The test took place at a high point of the 2017–2018 North Korea crisis. The United States Geological Survey reported an earthquake of 6.3 magnitude not far from North Korea's Punggye-ri nuclear test site. South Korean authorities said the earthquake seemed to be artificial, consistent with an underground nuclear test. The USGS, as well as China Earthquake Networks Center, reported that the initial event was followed by a second, smaller, earthquake at the site, several minutes later, which was characterized as a collapse of the cavity formed by the initial detonation. While early intelligence and academic reports suggested yields between 100 and 160 kilotons of TNT, later yield estimates were between 250 and 400 kilotons. Via the International...

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