Worldbuilding has been doing rounds around Yellowstone:
I don't know if Yellowstone is too narrow. I'm aware of the volcanoes tag.
Anyway, I submit this to the consideration of the community.
As I said to bilbo_pingouin the intention is not to separate Yellowstone. Instead the intention is to ease discovering these questions. The reason being that the consecuences questions have a lot of overlap and - even considering them different enough - people would benefit from reading the other questions and their answers.
I also agree on that a tag for supervolcanoes is more appropiate than a Yellostone one.