https://earthquake.usgs.gov/earthquakes/eventpage/us2000aetk#executive

Seismic event colocated with the larger possible explosion 8 minutes and 32 seconds earlier.

This significantly smaller event is likely a secondary feature (possibly a structural collapse) associated with the larger event.

M 6.3 Explosion – 22km ENE of Sungjibaegam, North Korea

2017-09-03 03:30:01 UTC 41.343°N   129.036°E 0.0 km depth

Possible explosion, located near the site where North Korea has detonated nuclear explosions in the past. If this event was an explosion, the USGS National Earthquake Information Center cannot determine its type, whether nuclear or any other possible type. The Air Force Technical Applications Center (AFTAC) is the sole organization in the federal government whose mission is to detect and report technical data from foreign nuclear explosions.

http://www.asahi.com/ajw/articles/AJ201709030017.html

Prime Minister Shinzo Abe on Sept. 3 announced that North Korea may have conducted a nuclear test, its sixth and first in a year, citing data obtained by the Meteorological Agency.

“The agency detected seismic waves with the epicenter in and around North Korea,” Abe told reporters. “There is the possibility that it was not an earthquake and that it was caused by a North Korean nuclear test.”

He added, “We find it completely unacceptable and must protest strongly if it is confirmed to be a nuclear test.”

The prime minister said he will call a meeting of the National Security Council to gather information for analysis and has ordered government ministries and agencies to collect and analyze data, offer information to the public in a timely manner and work together with the United States, South Korea, China and Russia.

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