Yeah, it's probably basically a nuclear-explosion-crater (maybe minus the radiation?).
BUT, the author of this adventure (you), can decide that the explosion was so alien and powerful that it reacted with some kind of (alien?) material (like how sand turns to glass), and creates some new alien material or whatnot, that could be used for something, maybe it even has some kind of "loop-resistant" properties, or whatever.
Maybe that material is something similar to whatever that artifact was you touched that fused to the players body, and enabled the looping stuff to happen?
Maybe you can place that material on something, and it prevents that thing from resetting in the next (1x) loop?
Maybe it is a very volatile compound that reacts quickly with the thin atmosphere, but because the atmosphere is so thin, it reacts slowly enough that it can be captured and studied.
Be creative :)
Just so there is something to do if you happens to be nearby when it blows and you survive it.