After North Korea detonated a nuclear bomb inside a mountain, scientists watched it move

When North Korea detonates nuclear bombs, it brings the devices into tunnels dug deep inside Mount Mantap, a granite peak over 7,000 feet tall. Mantap has now sustained six such detonations, with the last of which — set off on September 3, 2017 — moving the mountain more than 11 feet (3.5 meters), according to researchers who used space imaging technology, called synthetic aperture radar, or SAR, to map how much Mantap's surface shifted and then settled back down during the blast. They published their results in the journal Science on Thursday.

Although this technique isn't yet used to rapidly detect attempts at secretive nuclear testing today, it could help do so in the future.  Read more...

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