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Earthquake and Volcano of the Korea Monitoring Division Director Ryoo Yong-gyu speaks to the media about North Korea's artificial earthquake with a map of the Korean peninsular in Seoul, South Korea, Sunday, Sept. 3, 2017. North Korea said it set off a hydrogen bomb Sunday in its sixth nuclear test, which judging by the earthquake it set off appeared to be its most powerful explosion yet.(AP Photo/Lee Jin-man)