KIM’S DISASTER North Korea nuclear base COLLAPSES ‘killing at least 200 people’ amid fears of massive radioactive leak

They posted an analysis of data collected from more than 100 seismic monitoring sites across China.

This has narrowed down the location of Pyongyang’s nuclear tests with a margin of error of just 100m. They’ve all been under the same mountain.

Seismic data showed the underground test triggered an earthquake of magnitude 6.3, around ten times more powerful than the fifth test a year ago.

Satellite images showed the blast caused numerous landslides around the Punggye-ri test site, according to the Washington-based 38 North monitoring project.

But Chinese nuclear weapons researcher and chair of the China Nuclear Society Wang Naiyan told the Morning Post a collapse could spark a major environmental disaster.

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.

“A 100 kiloton bomb is a relatively large bomb. The North Korean government should stop the tests as they pose a huge threat not only to North Korea but to other countries, especially China.”

Satellite photos taken just a day after the blast reveal new gravel and scree fields shaken loose by the blasts at an elevation of about 2205m.

Analysts said these appeared more numerous and widespread than those caused by previous detonations — which would be in keeping with the increased size of the bomb.

Wang said there are limited mountains in North Korea that are “suitable” to conduct a nuclear test.

He said if the North had simply drilled into the side of the mountain, this increased the risk of “blowing the top off”.

News of the tunnel collapse comes after it emerged Russia and the US have both flown nuclear bombers near the country as tensions grow over Kim’s nuke threats.