Reply #32: When nukes are set off, even underground,

[maine_raptor]

they create a very distinctive seismic signature. This is how the current test ban is enforced. And the force of the bast does not have to be large (for example North Korea's 4th of July test) to be detected. Many nations (France, Russia, etc.) have monitoring systems that look for this signature. It would be quite apparent that nukes had been used even without any visit to ground zero.