North Korea H-bomb test claim

North Korea has announced it has carried out its first hydrogen bomb test. H-bombs are much more powerful than atom bombs and use nuclear fusion, instead of fission, to trigger an uncontrolled chain reaction

CHINA

NORTH KOREA Chonmasan Taechon Hagap Kanggye Yongjori Tonghae Sohae Pakchon Yongbyon Pyongyang

Punggye-ri, 01:30GMT: 5.1-magnitude quake detected – similar to three previous atom bomb tests in 2013 (5.1), 2009 (4.5) and 2006 (4.1)

Yellow Sea (West Sea)

SOUTH KOREA Seoul Demilitarized Zone

100km 60 miles

RUSSIA

Sea of Japan (East Sea)

Nuclear facilities

Reactor

Research

Nuclear reprocessing

Uranium enrichment

Suspected enrichment site

Weapon testing

Rocket launch site

Sources: James Martin Center for Nonproliferation Studies, Rand Corporation