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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

North Korea has promised to close its underground nuclear test site at Mount Montaup later this month.

Shortly thereafter, President Trump is set to meet North Korea's leader, Kim Jong-un, in Singapore.

Regardless of how that goes, there is now an additional tool to investigate covert

subterranean tests, radar, specifically a type called synthetic aperture radar, which works

day and night and through clouds. Scientists already use seismic data in their nuclear detective

work. You know, we use the kind of techniques that earthquake seismologists use to figure out

some aspects of what that explosion did. Roland Bergman, a geophysicist at the University of California, Berkeley.

He says they can also measure isotopes in the air, as well as optical images pre and post-exposure

explosion. Now Bergman and his team have used synthetic aperture radar data

from German and Japanese satellites to gather more clues about North Korea's biggest blast

in September 2017. Comparing before and after scans of the test site, their analysis found

that the mountain bulged a dozen feet in one direction and sunk a foot and a half.

Using computational modeling, they then simulated what sort of blasts could have produced

those movements. In their estimate, the blast was at least six times as strong as the bomb the

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