ping to 106
Located at http://www.freerepublic.com/focus/news/2257598/posts?page=227#227 is a seismogram I posted earlier. It is from Inchon, SK, and is from an instrument with lower gain and at a different bandwidth. It shows the blast as an isolated impulse.
Also, you might appreciate the satelllite imagery analysis I posted at http://www.freerepublic.com/focus/news/2257598/posts?page=254#254, which shows a likely candidate site for the test very near the coordinates indicated by seismometry.