North Korea's Nuclear Tests Trigger Nearly 1,400 Earthquakes, Reactivating Dormant Fault Lines
North Korea's underground nuclear tests, conducted between 2006 and 2017 beneath Mount Mantap, have led to the reactivation of previously quiet geological fault lines, resulting in nearly 1,400 earthquakes. The final test in September 2017, estimated to be 100 to 250 kilotons, was powerful enough to register as a magnitude 6.3 earthquake. Geologists, including seismologist Kwang-Hee Kim of Pusan National University, have observed that seismic activity did not immediately subside after the explosions but instead intensified over several years. Researchers analyzed 17 years of seismic recordings from stations in China and South Korea, identifying 1,399 earthquakes, many of which were too small for routine monitoring. These earthquakes are concentrated along two roughly parallel structures extending north-northwest from the test site, suggesting the nuclear tests disturbed pre-existing weaknesses in the Earth's crust. Historically, Mount Mantap was not known for significant seismic activity, with only one maj...
