Two earthquakes were detected near North Korea's nuclear test site in Punggye-ri, North Hamgyong Province on Saturday afternoon.
The quakes were probably caused by a change in geological structure in the area as a result of the regime's nuclear test on Sept. 3, the UN's Comprehensive Nuclear-Test-Ban Treaty Organization said.
The magnitude 2.6 and 3.2 tremors occurred 6 km north-northwest of the nuclear test site at 1:43 p.m. and 5:29 p.m. Saturday, according to the Korea Meteorological Administration.
Right after the second, the KMA announced that they were natural quakes.
The China Earthquake Networks Center initially said it detected a magnitude 3.4 quake and imputed it to "an explosion," giving rise to the possibility of another nuclear test. But it later corrected the announcement and called the tremor "a natural earthquake."
Lassina Zerbo of the CTBTO tweeted that the quakes were "not man-made."
Zerbo called the quakes a result of "geological stress" caused by a man-made explosion on Sept. 3. They are similar to the tremor from a tunnel cave-in that occurred eight minutes after the sixth nuclear test, he added.
Read this article in Korean