How Do We Detect Secret Nuclear Tests?

North Korea just tested their 5th nuclear device, but how exactly do we know? How do we detect underground nuclear tests from so far away?

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North Korea’s Latest Nuclear Test: The Facts
http://www.seeker.com/north-koreas-latest-nuclear-test-qa-2000940637.html
“North Korea conducted a fifth nuclear test on Friday, an underground blast that Seoul quickly labelled its “most powerful to date.” Here are some key questions around the blast and the isolated state’s nuclear program. What do we know so far?”

N Korea ready for another nuclear test, says South
http://www.bbc.com/news/world-asia-37335789
“South Korean officials have said North Korea could be ready to conduct another nuclear test at any time. The North conducted its fifth underground nuclear test on Friday, thought to be its most powerful yet.”

North Korea claims successful test of nuclear warhead
http://www.cnn.com/2016/09/08/asia/north-korea-seismic-activity/
“North Korea said it hit the button on its fifth and potentially most powerful nuclear test Friday morning, claiming to have successfully detonated a nuclear warhead that could be mounted on ballistic rockets.”

CTBTO: Who We Are
https://www.ctbto.org/specials/who-we-are/
“The Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans nuclear explosions by everyone, everywhere: on the Earth’s surface, in the atmosphere, underwater and underground.”

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