Note this isn't all of the article, and the article notes there is a possibility of a caveat in the calculations, but it sounds like it is still a threat nonetheless.The single mountain under which North Korea most likely conducted its five most recent nuclear bomb tests, including the latest and most powerful on Sunday, could be at risk of collapsing, a Chinese scientist said.
By measuring and analysing the shock waves caused by the blasts, and picked up by quake stations in China and neighbouring countries, researchers at the University of Science and Technology of China in Hefei, Anhui province, said they were confident that they were all carried out from under the same mountain at the Punggye-ri test site.
The team from the seismic and deep earth physics laboratory made the claim in a statement posted on their website on Monday. Its leader, geophysicist Wen Lianxing, said that based on data collected by more than 100 earthquake monitoring centres in China, the margin of error was no more than 100 metres.
Wang Naiyan, the former chairman of the China Nuclear Society and senior researcher on China’s nuclear weapons programme, said that if Wen’s findings were reliable, there was a risk of a major environmental disaster.
Another test might cause the whole mountain to cave in on itself, leaving only a hole from which radiation could escape and drift across the region, including China, he said.
“We call it ‘taking the roof off’. If the mountain collapses and the hole is exposed, it will let out many bad things.”
http://www.scmp.com/news/china/diplomac ... ng-chinese