... You know, things like this make it incredibly hard to not outright get even more condescending about the way I speak. I already should probably calm down, but, needless to say, this entire ordeal is severely agitating... Of course, apart of the process would be to make the ability additions I suppose, and I should ask for yet another Kirito unlock to make such happen, but...
If the world had several explosions generate through it, the devastation would be massive. Nothing of the sort is mentioned. Like, you can get away with the world shaking without causing too much permanent damage, but explosions generating throughout it would absolutely require relief efforts.
... Then again, I suppose nothing really contradicts that fact beyond the anime clearly showing this as not literal, so I guess I refer directly to the quote to properly refute this.
This implies that the world was shaken by the explosions, which would leave a bit of an impact on the land that would probably serve as a notable landmark.
Now, something only a few KM probably wouldn't be notable but let's say it was 400 freaking kilometers like the world shaking would suggest.
It takes far less assumptions to assume this is just flowery language then it does to say everything around these hyper destructive feats is perfectly covered up and never addressed.