We were in Yellowstone about 6-7 years ago. At that time the park ranger was telling us about the displacement of the water in Lake Yellowstone. A ship that had sank about 30 feet down 50 years ago was now sitting on top of dry land. This was due to a giant lava gas bubble forming under the entire lake, much like a blister, pushing the entire lake upwards and displacing the water. Eventually, this bubble will burst. How long it will take is anyone guess, but it will happen and bubbles like this is normally a precursor to an eruption.
There is a good reason why America is not found in The Revelation as a world power ...