HS-ASr-R3-D3-O unintentionally and remotely triggered while we walked up a beat in skin track at 1445pm that ran down the east facing chutes off the Tuscarora Ridge. Ascended the standard boot pack from Catherine's Pass up Tuscarora Ridge. Approximately 20+ people had already ascended the boot pack today while we were digging holes in the area just below Catherine's Pass. Pit results were CT13 Q1 on the infamous facet chains, but no result from the ECT, a common theme that I have seen over the last couple of days. Reached the top of the boot pack and switched back over to skis and skins. All seven of us were heading up the well worn in ridge skin track in a group when we heard a large collapse and watched the cracks propagate and this size 3 avalanche release right in front of us and rumble down towards Lake Catherine. Did I mention that we were all single file on the skin track? Possible that heating played a part by accelerating the creep rates, and the shear mass of 7 of us in a group was enough to remotely trigger this. I've never seen anything like it.

Thankfully, there was no one walking underneath this path when it released. We watched the debris run towards Lake Catherine and checked to see if there were any tracks in the area. Luckily no sign of any traffic below. Called Alta Central to clear it.