Slab reaction

Snowmobile/human triggered: Rode up the drainage. Went to turn around due to lack up snow, snowmobile hit the side of the drainage that’s when the fracture occurred. Approx 50Ft in length, approx 50 CM depth. We rode meadows all day, dipped into trees to check snow depth, and rode conservatively due to lack of snow depth with hidden dangers under the snow (rocks, short trees)