A mushroom cloud produced by the first explosion by the Americans of a hydrogen bomb at Eniwetok Atoll in the South Pacific in 1952. H-bombs are hundreds of times more powerful than the Hiroshima blast
The biggest H-bomb blast to date was the Soviet Union's 'Tsar Bomba' which exploded in the Arctic with a force of 57 megatons.
The power of Hiroshima, by contrast, was just 10-15 kilotons, but nonetheless killed 200,000 people.
Both the A-bomb and H-bomb use radioactive material like uranium and plutonium for the explosive material, meaning both produce large amounts of radiation.
The technology of the hydrogen bomb is more sophisticated, and once attained, is a greater threat.
They can be made small enough to fit on a head of an intercontinental missile, making North Korea's pursuit of the device all the more worrying.
But the H-bomb requires more technology in control and accuracy because of the greater amount of energy involved.
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Experts believe North Korea may have just experimented with a 'boosted' hybrid device that mixed a hydrogen isotope in a normal atomic fission bomb. These devices are compared in the graphic above
The hydrogen bomb is in fact already the global standard for the five nations with the greatest nuclear capabilities: the US, Russia, France, the UK and China.
Other nations may also either have it or may be working on it despite a worldwide effort to contain such proliferation.
The first U.S. test of an H-bomb was on November 1, 1952 in the Marshall Islands, a chain in the Pacific Ocean.
The crew of a Japanese fishing boat that unknowingly went into the waters near the nuclear testing of one test got acute radiation sickness.
Since the 1960s, nuclear tests have gone underground to reduce radioactive fallout.
The hydrogen bomb was never dropped on any targets.
Read more: http://www.dailymail.co.uk/news/article-3386367/Magnitude-5-1-earthquake-detected-close-North-Korean-nuclear-test-site-trigger-concerns-country-conducted-new-atomic-explosion.html#ixzz3yCCaEveE
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