Most of the warheads are thought to be below 20 kilotons, equivalent to 20, 000 tons of TNT.
By comparison, the nuclear bomb the United States dropped on Hiroshima in 1945 released an estimated 15 kilotons of energy.
Early speculation from the South Korean defense ministry is that the blast was equivalent to 7 kilotons of TNT.
"This test registered a yield of several hundred tons as opposed to several kilotons, as you would expect, " the official said.
The space agency also increased the estimated amount of energy released in the meteor's explosion from about 300 to nearly 500 kilotons.
By contrast, the first nuclear bomb tested by the U.S. in 1945 had an explosive force of about 18 to 20 kilotons.
By contrast, the first nuclear bomb tested by the U.S. in 1945 had an explosive force of approximately 18 to 20 kilotons.
However, the US space agency Nasa said the meteor weighed 10, 000 tonnes before entering the atmosphere, and released about 500 kilotons of energy.
For instance, a look at industrial refined copper imports remained in their recent range of about 250 kilotons, with yearly growth continuing to contract.
The U.S. atomic bombs dropped on the Japanese cities of Hiroshima and Nagasaki in 1945 each generated explosions of more than 15 kilotons of TNT.
The atomic bomb dropped on Hiroshima in 1945 was 12-15 kilotons.
However, the US space agency Nasa said the meteor was 17m (55ft) wide and weighed 10, 000 tonnes before entering the atmosphere, releasing about 500 kilotons of energy.
By comparison, the first atomic bombs developed by the United States produced an explosion equivalent to about 19 kilotons, or 19, 000 tons of TNT, according to the U.S. Air Force.
The U.S. space agency, NASA, said the meteor released nearly 500 kilotons of energy, about 33 times more than the nuclear bomb the United States dropped on Hiroshima, Japan, in 1945.
CNN: Russian scientists track down fragments of Urals meteor
Data from a global network of sensors indicated that the disintegration of the Russia fireball unleashed nearly 500 kilotons of energy, more than 30 times the energy of the Hiroshima atomic bomb.
Russia estimated the force of Monday's blast at 10 to 20 kilotons, in the same neighborhood as the early U.S. devices, but the United States said it was still analyzing data from the test.
It weighed about 10 tonnes when it entered the Earth's atmosphere and broke apart 30-50km (20-30 miles) above ground, according to Russia's Academy of Sciences, releasing several kilotons of energy - the equivalent of a small atomic weapon.
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