I've accidentally triggered this in at least 3 different places, and it does feel like *some* kind of bug.
Nothing I've tried (rain including) stop the explosions, and the one time I tried to block the vent after the fact, I couldn't, because it blew up the barrel I used to block it. That took a bit of time and was weirdly buggy in the interim - it kept alternating between explosions and a flickering gas cloud that never fully went away, and the barrel only lasted a few seconds (at which point it was back to explosions). Maybe using rain during the bugginess would have worked, but that's hardly "correct".
Leaving the zone also has no effect, and these seemingly continue forever. It's fun when you trigger one in an underground area, and then 5 hours later go into a completely unrelated underground area that is basically suffering from permanent earthquakes because the cells are placed physically close enough to each other in the map that the sound/shaking transmits.
