"MINOR SCALE, a 2,400 ton high explosive test simulating a 4 kiloton near surface nuclear detonation (late 1980s)."

This is not a nuclear test, but a simulation of a nuclear test using non-nuclear explosives.

Source: http://www.dtra.mil/newsservices/photo_library/oe/CS/CS-3.cfm

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Derivative works of this file:  DeletingTheMainPageTCGproposal.png