Ryoo Yong-gyu, Earthquake and Volcano Monitoring Division Director, points at a chart showing seismic waves observed in South Korea, during a media briefing at Korea Meteorological Administration in Seoul

Ryoo Yong-gyu, Earthquake and Volcano Monitoring Division Director, points at a chart showing seismic waves observed in South Korea, during a media briefing at Korea Meteorological Administration in Seoul

South Korean soldiers and passenger watch a TV broadcasting a news report on Seismic activity produced by a suspected North Korean nuclear test, at a railway station in Seoul, South Korea, September 9, 2016.   Kim Ju-sung/Yonhap via REUTERS
South Korean President Park Geun-hye presides over an emergency meeting at her residence in Vientiane, Laos, in this handout picture provided by the Presidential Blue House and released by Yonhap on September 9, 2016.    the Presidential Blue House/Yonhap via REUTERS
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