Imagine if a asteroid impact worked like a shape charge, leaving behind a dent in the deeper layers, that becomes the base for a future volcano. Something like

Imagine if a asteroid impact worked like a shape charge, leaving behind a dent in the deeper layers, that becomes the base for a future volcano. Something like the Chicxulub Event would leave two "dents" one at the impact site and one at the opposite site, were the pressure wave would meet into a spike. To test that pet-theory yellowstone would need to be on the antipodde of a huge impact crater from million years ago, roughly around https://eng.wikipedia.org/wiki/Grande-Terre https://eng.wikipedia.org/wiki/Grande-Terre.