Unintentionally skier (patroler) triggered hard slab on steep area below traverse going out to backside from the top of Beaver Mountain. Don't often see avalanches on the beav backside, generally too gentle terrain, not so today. Had cracking far in front of my skis all day, including on lone pine. Lots of rippling and collapsing. One of the more active days I have seen. Also noted a buried avalanche on west facing slopes across from Bunchgrass parking lot on way down the canyon.