North Korea nuclear tests activate fault lines toward China border volcano

A joint Chinese-South Korean study in Science reports that North Korea's 2013-2017 nuclear tests at Punggye-ri altered regional geology, activating fault lines extending toward Mount Paektu, a volcano ~100 km away. The claim is based on seismic analysis and raises concerns about potential volcanic activity, though no imminent eruption is indicated. This is a scientific finding with geopolitical implications for regional stability.