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Research by Chinese geologists suggests that the mountain above North Korea's main nuclear test site has likely collapsed, rendering it unsafe for further testing and requiring that it be monitored for any leaking radiation.The data in the latest Chinese study was collected following the most powerful of North Korea's six nuclear device tests on Sept. 3, which is believed to have triggered four earthquakes over the following weeks. The yield of the bomb was estimated at more than 100 kilotons of TNT, at least 10 times stronger than anything the North had tested previously. The University of Science and Technology of China paper, authored by Tian Dongdong, Yao Jiawen and Wen Lianxing, said the first of those earthquakes, which occurred 8 1/2 minutes after the explosion, was "an on-site collapse toward the nuclear test center," while those that followed were an "earthquake swarm" in similar locations.The region isn't one where earthquakes naturally occur and no quakes were detected after the five smaller nuclear tests North Korea has conducted since 2006 .
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