The program CONEFALL is designed to estimate roughly the potential rock falls prone area.
The principle of the program is rather simple. A block can propagate if the slope is sufficiently steep. Physically consider that if the slope is steeper than a limit jp, then the block accelerates. If it is lower, it decelerates.
Using the previous assumption, a block can propagate from its source to the point of intersection of the topography with line starting from the source point making an angle jp with horizontal. The space where a block can propagate from a grid point is located within a cone of slope jp with a summit placed at the source point
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