Using Google Earth and SketchUp, professor Declan De Paor has found a way for geologist, geophysicists, archaeologists and others to display what they interpret to be happening below the surface of the earth. De Paor gave a presentation at the recent American Geophysical Union meeting on his use of Google Earth for subsurface investigations. I wasn't there. It was reported in Google Earth Design, Google Earth Blog and Ogle Earth. Sounds like AGU 2007 had many good virtual globe presentations plus the presence of a Google Earth booth.Because it's still holiday break, I haven't tried this yet, but it should be rather simple to do, and if I'm successful, I'll report back.
An added note about De Paor, he is a structural geologist, just like the developers of the other cool geology application of Google Earth that I talked about before.