Since the first atomic bomb went off in 1945, close to 2,500 of these destructive weapons have been tested (and in just two cases, used militarily) in one form or another. Citing data from the Johnston’s Archive of Nuclear Weapons, Bill Rankin of Radical Cartography has put together a map showing the location and magnitude of every known nuclear explosion on Earth. Here it is below (click the image to view it larger).
Note the uncertainty regarding South Africa and Israel; the former was in possession of working nuclear weapons until the end of Apartheid, though whether it tested any remains unknown. The latter is widely known to have a stockpile of weapons of mass destruction, though it pursues an official policy of “strategic ambiguity” on the matter (neither confirming nor denying the existence of such weapons. The atmosphere test that occurred southeast of South Africa in 1979 is believed to have been conducted by one or both these countries (or possibly neither — see Vela Incident).
Here is more analysis from the Washington Post, from where I derived the map:
More than 500 of these nukes were detonated in the atmosphere, sending fallout around the globe, says Rankin.
The filled circles indicate atmospheric detonations, while the hollow circles are underground or underwater tests. The size of the circle shows the yield of the blast, with the biggest circle representing explosions of more than 20 megatons.
The map shows that the U.S. was particularly active in underground detonations; the U.S. detonated 912 nuclear bombs underground, 206 in the atmosphere and five underwater. Most American tests took place at the Nevada test site or in the middle of the Pacific Ocean.
Statistics for the USSR are close, with 223, 756, and three bombs detonated in the atmosphere, underground and underwater, respectively. The United Kingdom, France and China are distant followers with just a few hundred or dozen detonations. In the last several decades, India has detonated six nukes underground, while Pakistan has detonated seven and North Korea has detonated one.
Present, efforts to ban or restrict nuclear testing notwithstanding, I wonder how many more tests remain to be conducted — and if any new countries will be responsible.