probably easier to use "bunker-busting" bombs on several supervolcanoes to have the same effect.

More on supervolcanoes: https://en.wikipedia.org/wiki/Supervolcano https://www.usgs.gov/faqs/what-a-supervolcano-what-a-supereruption https://www.heritagedaily.com/2019/07/10-of-the-largest-super-volcanoes/124137

And a couple documentary type videos on the subject: https://www.youtube.com/watch?v=G1pa6afh8o4 https://www.youtube.com/watch?v=Vt07neEU0bU

They're already planning to frack near Yellowstone (supervolcano) https://www.ecowatch.com/fracking-wyoming-2475758304.html https://billingsgazette.com/news/opinion/mailbag/could-fracking-awaken-yellowstone-supervolcano/article_85e30062-b3bf-5e6c-a345-5446412792af.html https://www.reddit.com/r/askscience/comments/2bz1ij/could_fracking_near_yellowstone_caldera/

Also might find this interesting; they already planned to use nukes for "constructive" purposes: https://en.wikipedia.org/wiki/Project_Plowshare And the Soviet programme to do the same: https://en.wikipedia.org/wiki/Nuclear_Explosions_for_the_National_Economy