How do I make a biome that appears after an event?

Aight, so I made a nuclear bomb in my mod, and I wanted to make it create a new biome after it explodes. I have the biome made, but I have no clue as to how I get the biome to appear after the explosion. I know people made infection mods that have biomes that spawn around something after a certain point, and I am willing to do a method similar to that.

From what I know, fillbiome has to have coordinates to work, so I don't think running that command would do anything.

Any bright ideas from the three people who might read this?