"North Korea's nuclear test in September didn't just generate diplomatic shockwaves but also a 6.3 magnitude earthquake.
Aftershocks have continued ever since, and on Saturday the US Geological Survey said it had detected two more, sparking significant debate about what might be going on underground.
On 3 September, North Korea tested its most powerful nuclear bomb to date at its Punggye-ri test site in the mountains in its northwest.
Pyongyang claimed it was a hydrogen bomb, which would have made it a device many times more powerful than an atomic bomb.
Experts have expressed concerns the explosion might have been so powerful it could destabilise the surrounding mountains."
http://www.bbc.com/news/world-asia-42305161
Aftershocks have continued ever since, and on Saturday the US Geological Survey said it had detected two more, sparking significant debate about what might be going on underground.
On 3 September, North Korea tested its most powerful nuclear bomb to date at its Punggye-ri test site in the mountains in its northwest.
Pyongyang claimed it was a hydrogen bomb, which would have made it a device many times more powerful than an atomic bomb.
Experts have expressed concerns the explosion might have been so powerful it could destabilise the surrounding mountains."
http://www.bbc.com/news/world-asia-42305161