This is approximately the amount of energy that would be released by the explosion of 1,000 kilotons (1,000,000 tons) of TNT.

a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT

the energy of an explosion that is equivalent to an explosion of 1 million tons of TNT. One megaton is equal to a quintillion (1018) calories. See also kiloton.

A million tons. This term is used to describe amounts of volcanic debris.

An explosive force equal to one million metric tons of TNT. The energy released in the explosion of one megaton of TNT is equal to 4.2 × 1022 ergs.

An equal explosive force to million metric tons of TNT. The energy sent in the explosion of megaton of TNT is equal to 4,2 xs 1022 ergs.

A million tons of TNT in explosive force, or the energy of 1000 kilotons, some 100 times that released by the first atomic bombs.