FILE - In this Sept. 3, 2017, file photo, 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. A study by Chinese geologists shows the mountain above North Korea's main nuclear test site has collapsed under the stress of the explosions, rendering it unsafe for further testing and necessitating monitoring for any leaking radiation. The findings by the scientists at the University of Science and Technology of China may shed new light on North Korean President Kim Jong Un's announcement that his country was ceasing its testing program.(AP Photo/Lee Jin-man, File)
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