If the rock is weak, or contains weak layers, it may be compressed and the ground above could subside.

In addition, weak layers of mudstone exist within the sequence.

For an avalanche to occur, it is necessary that a snowpack have a weak layer (or instability) below a slab of cohesive snow.

Passive margins above a weak layer develop a specific set of extensional structures.

The detachment along the weak layers was likely aided by the presence of high-pressure water in the sediment pore spaces.

The presence of weak geological layers is a factor which contributes to submarine landslides at all scales.

Overpressure due to rapid deposition of sediment is closely related to weak geological layers.

"We take the data back and analyze what the signal off the tip is telling us about how strong or weak layers are within the snow pack."

This usually makes a ragged, weak plated layer that looks dark, dirty, maybe even fuzzy.

Some streams flowed along weak layers that define the folds and faults created many millions of years earlier.