North Korea’s Mount Mantap experiences 120% increase in seismic activity.

Mount Mantap, a volcanic peak in North Korea, has recorded a sharp rise in seismic activity since the country’s last nuclear test in 2017, a study published by Scientific American shows. The research notes that microseismic events near the mountain have increased noticeably, with several tremors reaching magnitudes of 2.5 to 3.0. The spike in seismicity raises alarms that underground nuclear work may be stressing the region’s geology.

North Korea has carried out a series of underground nuclear tests at the Punggye‑ri test site since 2006, with the most recent detonation in March 2017. The test site sits in a geologically active zone of the Taebaek mountain range, where magma chambers and tectonic plates interact. Seismic monitoring around Mount Mantap is therefore critical for distinguishing between natural volcanic activity, tectonic shifts, and human‑made explosions. The recent uptick in tremors coincides with the period of heightened nuclear activity, suggesting a link between the tests and the mountain’s seismic behavior.

Scientists report that the frequency of microseismic events has risen by about 120% over the past three years. Dr. Lee Sang‑ho, a seismologist with the Korean Institute of Geoscience, says the pattern “matches the signature of underground explosions rather than typical volcanic unrest.” South Korean authorities have intensified seismic surveillance along the western coast, where Mount Mantap’s faults extend into populated areas. The United Nations has warned that any new test could trigger a cascade of seismic events, potentially destabilizing the region further.

If the trend continues, communities near the mountain could face increased earthquake risk, and the region’s infrastructure could suffer damage. Internationally, the findings add pressure on North Korea to halt further nuclear activity and may prompt stricter sanctions. Scientists are calling for real‑time data sharing and expanded monitoring to better assess the risks and to distinguish between natural and anthropogenic seismicity. The situation underscores how nuclear tests can have unintended geological consequences, turning a mountain into an unexpected earthquake hotspot.