Ok, that makes sense. I figured that, if anything, it would be frost weathering. That’s not an “explosion” in my mind though. Perhaps when a crack forms a lot of the tension in the wood is released and it can cause a sudden jolt or shift? If all the snow and frost on a tree suddenly jumped off after a loud crack I could see someone calling that an explosion. Definitely a lot of misleading terms and info kicking around. Thanks!