4 magnitude quake would be much smaller than the quakes caused by previous DPRK nuclear tests, the report saidAfter the incident, the center quickly organized seismological bureaus and geological institutions to evaluate the situation, it said开云体育APPSeismologists from the Chinese Academy of Sciences and the University of California Santa Cruz also published a joint report on Saturday that said tests had shown the quake "clearly falls in the natural phenomena category" and was similar to the last natural earthquake in the region, which was recorded in December 20043 magnitude quake, while the strongest, this month, resulted in a 6"The incident was not a nuclear expl开云体育APPosion, but had the characteristics of a natural quake," the China Earthquake Networks Center said late Saturday in a statement released online"What the concerned parties should do now is to strictly and comprehensively implement UN Security Council resolutions and make positive efforts to resolve the issue through dialogue," Chinese Foreign Ministry spokesperson Lu Kang said at a news briefing on Friday