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.
As Snowolf touched on you need specific type of trees to form tree wells. In Aus we don't get tree wells at all. Mainly due to the reason we don't get the volume of snow as they do in the PNW BUT even if we did, tree wells wouldn't from with our alpine gum trees. They are the complete wrong shape and they don't spread out at the bottom and taper at the top.
my names's Petey and i have gigantic balls