you mentioned "rock bursts or bumps".............
a couple of days ago, there was a bunch of people on a boat somewhere, taking pictures/video of a rock cliff somewhere, and the whole side collapsed into the lake, causing a tidal wave toward the boat those people was on ! luckily, none were hurt, but just seeing it on tv made me jump !
i know my standard response when someone asks me if i want to go out on a boat, : "i can't swim, so i'll stay on shore and guard the beer !" makes more sense than ever now !