Cave-ins simultaneous with experience events do 0 damage.

[qoonpooka]

Struck the motherlode (event, not actually). Cave-in triggered at the same time. Rocks fell all around me, I took zero damage. (Hilariously the cave-in trapped me and buried the ore again.)

Not complaining about zero damage from a cave-in, mind you. Hell, just getting buried alive was pretty spooky since you basically have to recall to hearthfire at that point lest you trigger more collapses, but I'm assuming I shouldn't be able to walk out of a cave-in absolutely unscathed...

[tyrtix]

cave-in hits random tiles in a radius, so can even NOT hit the tile you are standing in. Nothing to do with event triggered, also the tiles filled by a cave-in have the same chance to cave-in that had before, ie a tile that do not show dust, won't cave-in if you mine it again.