North Korea claims 'perfect success' of powerful nuke test North Korea claims 'perfect success' of powerful nuke test Associated Press ERIC TALMADGE Associated Press September 3, 2017 The North's latest test was carried out at 12:29 p.m. local time at the Punggye-ri site where it has conducted past nuclear tests. Officials in Seoul put the magnitude at 5.7; the U.S. Geological Survey said it was a magnitude 6.3. The strongest artificial quake from previous tests was a magnitude 5.3. "North Korea has conducted a major Nuclear Test. Their words and actions continue to be very hostile and dangerous to the United States," Trump said in the first of a series of tweets. He branded North Korea "a rogue nation which has become a great threat and embarrassment to China, which is trying to help but with little success."