Science Snapshots: September 20, 2026
A U.S. Geological Survey poster showing the Punggye-ri nuclear test site in North Korea in 2013. | Photo Credit: USGS North Korea’s nuclear tests reawakened sleeping faults While underground nuclear explosions usually set off brief aftershocks fading in weeks, North Korea’s tests at Mt. Mantap did the opposite, causing earthquake activity intensifying over years after…
