North Korea Nuclear Test Preliminary results of the September 3, 2017 Nuclear Test. Figure 1. Comparison of the Sep. 2017 event with the Jan. 2016 event. Figure 2. Correlation image of the InSAR data compared with seismic-derived location of the Sep. 2017 event from various groups. Figure 3. Phase image compared with local topography. The colorbar convention is the same as figure 1. Purple/blue means moving towards the satellite and red means moving away from the satellite.