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That varies with:

  • yield
  • burst height/depth
  • terrain
  • if subsurface, the material around the burst
  • inversion layer present or absent
  • etc.

Using my Nuclear Weapon Effects circular sliderule, assuming distance for 1 psi maximum overpressure as "blast radius":

A 1 KTon yield at optimum burst height on flat terrain: 1.35 miles.

A 1 KTon yield surface burst on flat terrain: 0.75 miles.

A 20 KTon yield at optimum burst height on flat terrain: 3.64 miles.

A 20 KTon yield surface burst on flat terrain: 2.00 miles.

A 10 MTon yield at optimum burst height on flat terrain: 29 miles.

A 10 MTon yield surface burst on flat terrain: 15.8 miles.

1 psi maximum overpressure was selected because structural damage to buildings due to blast wave and wind is minor, however glass, plaster, etc. damage will be much further out.

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