Local snowmobiliers may have remote triggered, they were riding nearby on same slope further along. There were unaware of the danger. The slab slide went to dirt and about 20m wide under a hanging cornice. I didnt want to get close to measure but was 3.5 - 6'' deep and ran about 15m. Slope angle was in upper 40's to mid 50s. We received 12" of medium to heavy powder and another 3-4 of light on top there in the last 24