A South Korean official explains seismic waves of North Korea's nuclear test which were measured in South Korea, at the Korea Meteorological Administration in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Yonhap, Lee Ji-eun) KOREA OUT

Associated Press
A South Korean official explains seismic waves of North Korea's nuclear test which were measured in South Korea, at the Korea Meteorological Administration in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Yonhap, Lee Ji-eun) KOREA OUT
A South Korean official explains seismic waves of North Korea's nuclear test which were measured in South Korea, at the Korea Meteorological Administration in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Yonhap, Lee Ji-eun) KOREA OUT
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