Are there any signs to look for that trees may have wells? I do a fair bit of riding through trees and plenty of times alone but never really been aware of the dangers of tree wells. In Australia it isn't something discussed as rarely get such deep amounts of snow and most alpine trees a small in oz. Siberia is a different story though so would love to get more info on this topic.
Come over to the PNW we'll show you some wells. I can't really imagine riding any other place besides the PNW. I don't know about where you ride but here you have to be cautious when riding through trees pretty much all of them have some sort of hole around them because only the top of the trees stick out and the snow is packed lightly which make it easy to fall through.