USGS information poster showing the intensity of the 2013 North Korean nuclear test.
USGS
USGS Earthquake Hazard Program, <a rel="nofollow" class="external free" href="https://earthquake.usgs.gov/earthquakes/eqarchives/poster/2013/NorthKorea.jpg">https://earthquake.usgs.gov/earthquakes/eqarchives/poster/2013/NorthKorea.jpg</a>