Wouldn't the creation of a dome from below be sufficient enough to
realize that the interior is heating up? here's an article I found w/
info on where it came from:
Question: I'm looking for information on Hick's Dome in southern Illinois. I've heard it was created by an
underground volcanic explosion. I'd like to know if this is true, and when this occurred, plus any other interesting facts about it.
Answer: Basically, you are correct. Most geologists who have studied Hicks Dome interpret it as the product of one or more
underground volcanic explosions. Drilling into the core of Hicks Dome reveals greatly shattered sedimentary rocks, intermixed with igneous material. Also, small igneous dikes radiate from the center of Hicks Dome on the surface. I have heard suggestions that Hicks Dome resulted from a meteorite impact, but the
surficial and underground structure of the dome clearly indicate that the forces that formed the dome came from below, rather than above.
If you are interested in a technical report that provides more details, see our ISGS Circular 550, written by J.C. Bradbury and J.W. Baxter in 1992.
You may find information on Illinois State Geological Survey Publications at:
http://www.isgs.uiuc.edu or you can contact our Information Office at 217/333-4747.