## Collapses (Rockfalls)

### Definition :

Collapses involve the sudden fall of rock masses. A typical example is the collapse of a cliff section, which can result from:

- Erosion of underlying layers

- Evolution of pre-existing discontinuities (e.g., cracks)

Collapse due to erosion of underlying layers

### Example :

As an example, the photo shows the rockfall at El Kantara cliffs, triggered by the widening of fissures.

Collapse of the El Kantara cliffs caused by crack evolution