North Korea Nuclear Detonations, Missile Tests: Timeline

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North Korea Says Conducted Nuclear Test Successfully

North Korea conducted its fourth underground nuclear test Wednesday, detonating what the government said was its first hydrogen bomb, a device significantly more powerful than those used in previous tests.

The test was conducted in a "safe and perfect manner" with "no adverse impact on the ecological environment," the official Korean Central News Agency said. Kim Jong Un’s government said it set off a hydrogen device at 10 a.m. local time. The explosion was first detected as a magnitude 5.1 earthquake by the U.S. Geological Survey.

1976-81: Begins development using SCUD-B missile from the Soviet Union and launchpad from Egypt

1984: First SCUD-B missile test firing

1988: Operational deployment of SCUD-B and SCUD-C missiles

1990: First Rodong missile test firing

1998: Operational deployment of Rodong missiles, which have a range of 1,300 kilometers. Firing of Taepodong-1 missile, which North Korea says was a satellite launch

2005: North Korea announces possession of nuclear weapons and its withdrawal from six-party talks aimed at ending its atomic program

July 2006: Taepodong-2, Rodong and SCUD missiles test firings

Oct. 2006: Korean Central News Agency announces “a successful nuclear test”

2007: Operational deployment of Rodong missiles

April 2009: Firing of Taepodong-2 missile, which North Korea says was satellite launch. United Nations strengthens sanctions and North Korea responds by withdrawing from six-party nuclear disarmament talks

May 2009: North Korea carries out second nuclear test

July 2009: Test-firing of SCUD and Rodong missiles

Kim Jong-Il’s funeral procession in Pyongyang on Dec. 28, 2011

Photographer: Kyodo News/AFP/Getty Images

Dec. 2011: North Korean leader Kim Jong Il dies, clearing way for son Kim Jong Un to take power

April 2012: North Korea says Unha-3 rocket launch failed

Dec. 2012: North Korea launches Unha-3 rocket that puts its first satellite into space

Feb. 2013: North Korea conducts third underground nuclear test

Aug. 2013: North Korea reported to have restarted nuclear reactor to produce plutonium

May 2015: North Korea claims to have tested a submarine-launched missile; says it developed technology to mount nuclear warhead on a missile

North Korea’s underwater ballistic missile launch in May 2015.

Photographer:Ahn Young-oon/AP Photo

July 2014: North Korea conducts series of missile tests ahead of Chinese President Xi Jinping’s visit to Seoul

Sept. 2015: North Korea threatens nuclear attack against U.S. and reaffirms its main reactor is operational. South Korean President Park Geun Hye says North would "pay a price" for fourth test

Dec. 2015 Kim Jong Un says North Korea is “ready to detonate” a hydrogen bomb

Jan. 2016: North Korea says it successfully tests hydrogen bomb