The newly disclosed and declassified information details the U.S.'s nuclear disarmament and efforts to reduce its nuclear weapons total between 1962 and last year, as well as details on previous placement of weapons near Japan, the names of and megatonnage
of older weapons, and even numbers on weapons stationed abroad.
From the metric of "equivalent megatonnage
," which linearized the total destructiveness of superpower nuclear arsenals on the basis of the total area their warheads could theoretically expose to a certain blast overpressure, to the more sophisticated "counterforce potential" that incorporated accuracy to estimate an arsenal's total ability to hold hardened targets such as ICBM silos at risk, to full strategic exchange models that aimed to estimate how many weapons would be available to retaliate after a preemptive strike, analysts generally assumed that nuclear war could be reduced to measures of radii and area.
Conway Morris, "The Cambrian 'Explosion': Slow-Fuse or Megatonnage
?," Proceedings of the National Academy of Science 97, no.
In terms of total megatonnage
, the advantage certainly lies with the other side.