The noise/vibration from my snowmobile triggered the avalanche about 100 feet from me. There still remains a crack in the snow from the 4 foot slab slide towards my snowmobile, suggesting more snow is yet to come down. There have been high winds near the summit of Logan Canyon the last couple of days, and this cornice looked like a large wind blown cornice consisting of soft snow where the top of the ridge just above the cornice hardly had any snow. This avalanche is about 200 feet from Highway 89 in Logan Canyon and visible from the Bear Lake overlook visitor center (it's just across the street).