April 05, 2020

Second quake near North Korean test site could be tunnel collapse
Second earthquake event detected by U.S. and Chinese earthquake monitoring stations
A second earthquake event measuring 4.6 magnitude detected by the China Earthquake Networks Center on Sunday may have been a tunnel collapse, a U.S. earthquake monitoring service said. The event, which took place at a reported depth of 0km and allegedly occurred eight minutes after the first nuclear test, was confirmed by the USGS Earthquake Hazards Program later as a 4.1 magnitude "collapse".