North Korea Nuke Test Triggers Earthquake More Than a Year Later

A small earthquake in North Korea on Wednesday was caused by a nuclear test that country conducted more than a year ago, CNN reports. The September 2017 test—the country’s sixth and most powerful—caused an initial magnitude 6.3 quake, per phys.org, followed by a magnitude 4 earthquake believed to be caused by the area above the underground test site at Mt. Mantap collapsing. During the intervening months, seismometers in China, South Korea, and the US have detected several aftershocks ranging between magnitude 2.1 and 3.4 within the region of the Punggye-ri nuclear test site. Wednesday’s quake was magnitude 2.8, according to South Korea’s Meteorological Administration, CNN reports. The Punggye-ri site has since been closed, according to reports (More North Korea stories.)