The U.S. Geological Survey just reported that a magnitude 4.9 earthquake in North Korea has been detected a few hours ago, but neither Pyongyang nor Seoul confirmed whether North Korea had conducted its widely anticipated third nuclear test.
According to Fox News, the South Korean Defense Ministry said it was trying to determine whether this is due to nuclear testing by North Korea. Tremors can be created by nuclear tests but they are distinct from those caused by natural earthquakes.
♦ Earthquake detected in North Korea, USGS says, FoxNews http://www.foxnews.com/world/2013/02/11/earthquake-detected-in-north-korea-usgs-says/
♦ 'Artificial' Earthquake in North Korea Raises Nuclear Fears, NYMag.com http://nymag.com/daily/intelligencer/2013/02/earthquake-in-north-korea-raises-nuclear-fears.html
♦ U.S. Geological Survey website http://www.usgs.gov
♦ North Korea Earthquake: Magnitude 4.9 Temblor Detected By U.S. Geological Survey