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This event occurred in the area of the previous North Korean Nuclear tests. The event has earthquake-like characteristics, however, we cannot conclusively confirm at this time the nature (natural or human-made) of the event.
The depth is poorly constrained and has been held to 5 km by the seismologist.
The Air Force Technical Applications Center (AFTAC) is the sole organization in the U.S. federal government whose mission is to detect and report technical data from foreign nuclear explosions.Text