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If you’re a recreational rider or an avalanche forecaster, you have likely questioned how to interpret snow instability test results. At which point do the results go from dangerous to safe? This is a great video of Bruce Jamieson talking about the statistics for compression test fractures and the characteristics of the fracture. 

This presentation video for advanced recreationists and practitioners identifies the five types of fracture character and shows the frequency of skier triggering on slopes that exhibited each type of fracture character in compression tests. The frequency of skier triggering is also presented for each type of fracture character separately for easy, moderate and hard taps.



Colin Balke is a content editor for who lives in Northern California. When not plucking away on a keyboard, he can be found splitboarding, camping, backpacking, or hanging out with family and friends.

One Comment

  • Scooby2 says:

    nice share there-lots of interesting reads, below is the link to the list of articles from Bruse Jamieson and others at UCalgary:
    (you have to open the google scholar link or do a google search to get some of the papers open)

    This one was interesting finding skiers were stressing certain types of snowpacks 1.5 times as much as boarders on average. Small consolation for having your feet locked in 🙂 I guess this is because average ski is a little narrower than half a split and will at times have all the weight of a skier on one ski. I imagine super fat skis with Stein-style would be like a boarder also. A falling skier (probably same as falling boarder) stressed a snowpack way harder, more than a snowmobile.