[EXPRESS.CO.UK] The micro-quake occurred about 1.7 miles northeast of the Punggye-ri nuclear site in the country's northeastern province of North Hamgyong, the Korea Meteorological Administration said on its website."The quake is a natural one and it is believed to have occurred in the aftermath of the sixth nuclear test", it said.
Minor tremors have been detected at the site since the North carried out its sixth and most powerful nuclear test underground in September, damaging geological structures in the area.
An official of the Korea Meteorological Administration said: "Kilju is a rocky area where natural earthquakes normally do not occur.