One of my favorite football stats is called “toxic differential.” Brian Billick put this idea out into the NFL stat-osphere and I instantly took a liking to it. The idea was to account for team health by balancing the big plays you create on offense and defense with the bad plays you allow. In the article linked above, Billick describes explosive plays as over 20 yards. Teams have different thresholds for what they consider explosive and there is no consistent reportable mark on a lot of publicly available stat sites.
My memory of that article attributed an explosive run as any over 15 yards, but that comes from Sharp Football Stats, which I have adopted as my standard as well.