China’s earthquake administration said on Saturday it had detected a magnitude 3.4 earthquake in North Korea that was a “suspected explosion”.
The administration said in a statement on its website that the earthquake, which occurred around 08:30 GMT, was recorded a depth of zero kilometres.
Previous quakes from North Korea have indicated nuclear tests by the state, the most recent earlier this month. The tremor was centred near North Korea’s nuclear test site.
Nuclear proliferation watchdog CTBTO said it was examining what it called “unusual seismic activity” in North Korea.
“Analysts looking at unusual #seismic activity of a much smaller magnitude in the #DPRK,” CTBTO Executive Secretary Lassina Zerbo said in a Twitter post, adding more details were set to emerge later.
However, South Korea’s weather agency said it was analysing the nature of the quake and its initial view was that it was a natural earthquake.