Nuclear Bomb Test By North Korea

What is the yield of the North Korean nuclear test bomb?
South Korea recorded a tremor of 3.58 Richter scale; the US Geological Services measured 4.2 Richter scale. Based upon these data, South Korea puts the explosion as being equivalent to 550 tons of TNT, or 2.6% of the 1945 Nagasaki atomic bomb. However, Russia estimated the yield to be 5,000-15,000 tons or equivalent to the Hiroshima atomic bomb which killed 240,000 people.
Reuters - UN Council Members Condemn North Korea's Actions
Associated Press - World Leaders Condemn North Korea's Nuke Test
North Korea - Official Homepage
Tags: North Korea, Nuclear, South Korea, USA, TNT, United Nations, UN Security Council