The CTBTO already said they saw it: "At 01:30:00 (UTC) on 06 January 2016 the CTBTO's monitoring stations picked up an unusual seismic event in the Democratic

The CTBTO already said they saw it: "At 01:30:00 (UTC) on 06 January 2016 the CTBTO's monitoring stations picked up an unusual seismic event in the Democratic People’s Republic of Korea (DPRK). The location is very similar to the event our system registered on 12 February 2013. Our initial location estimate shows that the event took place in the area of the DPRK’s nuclear test site. The DPRK also claimed today that it has conducted yet another nuclear test, the fourth since 2006."