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Rise in quake activity detected at North Korean nuclear test site
CNN • • world
Key Points:
- Scientists have detected an unexpected and prolonged increase in seismic activity at North Korea’s Punggye-ri nuclear test site since the country's final and most powerful underground nuclear test in 2017.
- Analysis of seismic data from 2008 to 2025 revealed 1,399 earthquakes around Mount Mantap, with frequency and magnitude increasing over time, unlike typical short-lived post-explosion seismic patterns.
- Researchers believe the underground explosions activated preexisting intraplate faults, causing ongoing seismicity as the Earth's crust did not return to normal after the 2017 test.
- The study suggests that fractures from the nuclear blasts may have allowed water infiltration, increasing pore pressure and triggering delayed seismic activity that can persist for years.
- This prolonged seismic activity complicates monitoring of nuclear test sites by blurring distinctions between explosion-induced and tectonic earthquakes; no evidence of further nuclear tests since 2017 was found, though North Korea has reportedly restored test tunnels.
