North Korean earthquake was likely caused by nuclear test

North Korea threatened last month to carry out its third nuclear test, and all indications are that it has done so this morning. Reuters reports that a UN Security Council diplomat confirmed the test, and a South Korean Defense Ministry spokesman told Bloomberg that there was a "high possibility" a 5.1-magnitude artificial tremor in the North was caused by a nuclear explosion. Yonhap quotes a South Korean official as saying that North Korea alerted the US and China yesterday of its plans to test...