North Korea Nuclear Tests

North Korea conducted its sixth and the largest nuclear test to date on September 3rd, 2017. The U.S. Geological Survey (USGS) reported it as a magnitude 6.3 explosion at the Punggye-ri test site, a mountainous region in the northeastern part of the country ( The USGS preliminary epicenter location is (41.343N, 129.036E), which is at a substantial distance (~8 km) away from the tunnel entrance reportedly used for the nuclear tests ( Using seismic waves recorded at regional distances and by modeling waves scattered by surface topography, we determined the epicenter location at (41.309N, 129.067E), with an estimated uncertainty - approximated as one-standard deviation - of (0.4 km, 0.6 km, 0.53 km) in the longitude, latitude, and depth directions.

We will update this website with additional information. An one-page summary of the results can be downloaded here as a pdf file.