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📘 A quiet slope can already be under tension

Stand below a snowy mountain after a storm and the surface may look still, even though gravity is working on every layer. An avalanche needs more than a white slope: it needs a potential sliding surface, enough incline for snow to move, and

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The mountain is loaded before it movesExplain how slope angle, wind loading, and slab structure create the conditions for release.Terrain and weather build a snowpack whose layers can carry stress unevenly.
  2. The weak layer is the hidden hingeDistinguish a weak layer from the cohesive slab above it and describe collapse-based fracture.A slab avalanche depends on a fragile boundary beneath a connected moving layer.
  3. A trigger is a small change in a large systemExplain why a small disturbance can initiate a fracture that propagates beyond its source.The trigger is the final change, while the snowpack structure determines whether failure spreads.
  4. Release becomes motionConnect release mechanics with snow type, warming, terrain, and avalanche travel.Once detached, snow accelerates, entrains material, and changes according to flow and terrain.

Questions this course answers

Which combination best describes the setup for a slab avalanche?

The slab supplies a connected moving body, the weak layer supplies a failure plane, and slope supplies downhill motion.

Why is a weak layer alone not enough to make a slab avalanche?

The upper slab is the connected mass that detaches and moves when the weak layer fails.

What makes remote triggering possible?

Stress and collapse can travel through connected snow, releasing a steep panel away from the initial disturbance.

What can happen after a slab detaches?

Gravity and terrain drive the released mass, while collisions and entrainment can increase its size and alter its behavior.

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