[watsisname]

And not leave behind any physical evidence, either?  I don't think so.

Nor is the isolated location a very compelling argument.  When you're talking about geologic turmoil of that magnitude, it does not matter how isolated such an energetic event is from human civilization, because the effects are global and they would have been observed.  The Krakatau eruption was noticed globally.

[karajorma]

The island being destroyed by aliens is frankly a more realistic explanation than that there is a genuine geological explanation.