That would be at the very least a very very large conventional explosion. Nuke or not will have to wait for radiation sensors like our Bhangmeters in orbit. No, that’s really what they’re called.
Fortunately, ours are not the only ones in orbit because Obama wouldn’t tell us a nuke had gone off even if one had.
A bit strange. Looks like an initial explosion and a secondary, not a clear fade like the Indian and Paki explosions.
Good find. Explosion followed by resultant chamber collapse. Likely nuke.
NK was rumored to be working on a fusion bomb. This might have been the fission fuse detonating without fusion results.