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Blast Zones...

1 - Vaporization Point

    Everything in this area is vaporized by the blast... EVERYTHING
99% fatalities.  Overpress : 25 psi @ ground level.  Wind : 320+ mph

2 - Complete destruction

    Very technical term, isn't it? Any and all above-ground structures are destroyed utterly.
92% fatalities.  Overpress : 17 psi @ ground level.  Wind : ~290 mph

3 - Severe Blast Damage

    Mostly damage to larger structures (factories, highways, etc.)  Rivers often flow in reverse.
67% fatalities.  33% injured.  Overpress : 9 psi @ ground level.  Wind : ~260 mph

4 - Severe Thermal Damage

    Anything that can burn, will.  Many people die of asphyxiation because the majority of the oxygen in the area is consumed by the fires.
51% fatalities.  47% injured.  Overpress : 6 psi @ ground level.  Wind : ~140 mph

5 - Severe Fire & Wind Damage

    Residential structures destroyed.  People get blown around and live to feel it all.  Many 2nd & 3rd degree burns from air temperature alone.
16% fatalities.  53% injured.  Overpress : 3 psi @ ground level.  Wind : ~90 mph
 

Blast Zone Radii...

10 Kilotons 1 Megaton 20 Megatons
Zone Airburst : 1,980 ft. Airburst : 8,000 ft. Airburst : 17,500 ft.
1 0.5 miles 2.5 miles 8.75 miles
2 1 mile 3.75 miles 14 miles
3 1.75 miles 6.5 miles 27 miles
4 2.5 miles 7.75 miles 31 miles
5 3 miles 10 miles 35 miles