Timeline of North Korea’s Nuclear Tests

North Korea Claims It Has Detonated a Hydrogen Bomb (KCNA/Reuters)

SEOUL (ABC News) — As North Korea claims it has successfully tested a hydrogen bomb, here is a list of its previous nuclear tests.

Oct. 9, 2006

North Korea’s first underground nuclear test at Punggye-ri, also known as Punggye-yok, a remote area in the Northeast near the town of Kilju.

The blast was based on plutonium and its explosive force, relatively small, was less than 1 kiloton.

Pyongyang gave an advance warning to the international community, six days prior, of its intention to test the nuclear device.

Days later, the U.N. Security Council unanimously approved military and economic sanctions against North Korea.

May 25, 2009

Barely a month after North Korea walked out of international talks on its nuclear program, it conducted a second underground test, detonating a plutonium nuclear device.

This time, the power of the explosion was equivalent to U.S. bombs that destroyed Hiroshima and Nagasaki, Japan, in 1945.

Although North Korea did not specify the location, a 4.7-magnitude quake was detected near the first nuclear test site, Punggye-yok.

The underground bomb test followed hard on the heels of the test of a long-range missile in April 2009.

North Korea claimed it succeeded, but the missile flew only 90 seconds after takeoff.

Feb. 12, 2013

North Korea confirmed its third underground nuclear test after unusual seismic activity was detected near the same Punggye-ri nuclear site.

The United States Geological Survey confirmed a magnitude-5.1 artificial earthquake.

This time North Korea claimed to have developed a lighter miniaturized nuclear device to fit on the top of the long-range missiles that could reach the mainland of United States.

South Korea’s Defense Ministry estimated the yield to be approximately 6 to 7 kilotons.

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