>>472153Absolutely an avalanche track.
Most avalanches release between 25 and 45 degrees. Less than that, gravity doesn't pull hard enough to move the snow. More than that, snow doesn't have a chance to settle up before sliding down. 38° is the magic number- the angle where most avalanches occur. Which, judging from that pic, is just about where that's at.
That slope looks to be right around treeline. I'm guessing wind is a major contributor to that slide - Snow gets carried and deposited on the leeward side of the peak, adding weight to the snowpack. Rocks underneath often serve as triggers when enough snow is deposited on top. Cornice breaks off, shifting the snow in a very short period of time, causing a collapse that propagates along that ridgeline and releases a slab.
Areas like that pic are a real obvious sign of avalanche activity in that area - factors you need to consider when travelling in avalanche terrain. Other signs include tree "flagging", where branches on the upward side of the tree are removed and only the downhill branches remain up to a certain height on the tree; and when there's snow on the ground, things like shooting cracks or "whumphing" sounds coming from the snowpack.
General avalanche thread, I guess? Gear/equipment, snow science, terrain evaluation, etc.
>Pic extremely related 
