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Description
Seeing that mushroom cloud just before entering vault 111 I asked myself what yield that bomb had. I also knew about the Nukemap application by Alex Wellerstein for Google maps which I think shows the effects quite nicely.

First issue is the actual map size. In the real world Concord is roughly 30 kilometers away from ground zero, somewhere south of Natick. In the game everything is much closer, as we know. The same distance is reduced to about 2.7 kilometers. You get that value for 200000 in-game units and using 75 units per meter. Which makes sense when reading about people running the breadth of the game in under 20 minutes.

The second issue is to measure the explosion. You could measure the height and width of the mushroom cloud. Hanging around while it stabilizes itself doesn't seem a good idea with that air blast wave coming towards you
There is a better option by using the crater radius. With the "satellite" image for measuring it, it's simple. Roughly 50 meters for the inner radius seems right. And that in turn could be caused by a 20 kiloton nuclear bomb detonated on the surface. Which is actually a low yield bomb, and not a megaton monster.

That air blast wave hitting vault 111 in the game looks unrealistic. But Sanctuary Hills does gets hit by a 1 to 2 psi overpressure wave at the above mentioned distance. This would definitely cause damage to ordinary houses as modelled in-game.

Description
Seeing that mushroom cloud just before entering vault 111 I asked myself what yield that bomb had. I also knew about the Nukemap application by Alex Wellerstein for Google maps which I think shows the effects quite nicely.

First issue is the actual map size. In the real world Concord is roughly 30 kilometers away from ground zero, somewhere south of Natick. In the game everything is much closer, as we know. The same distance is reduced to about 2.7 kilometers. You get that value for 200000 in-game units and using 75 units per meter. Which makes sense when reading about people running the breadth of the game in under 20 minutes.

The second issue is to measure the explosion. You could measure the height and width of the mushroom cloud. Hanging around while it stabilizes itself doesn't seem a good idea with that air blast wave coming towards you
There is a better option by using the crater radius. With the "satellite" image for measuring it, it's simple. Roughly 50 meters for the inner radius seems right. And that in turn could be caused by a 20 kiloton nuclear bomb detonated on the surface. Which is actually a low yield bomb, and not a megaton monster.

That air blast wave hitting vault 111 in the game looks unrealistic. But Sanctuary Hills does gets hit by a 1 to 2 psi overpressure wave at the above mentioned distance. This would definitely cause damage to ordinary houses as modelled in-game.