RoARS (Rockfall Activity Rate System)

The Rockfall Activity Rate System (RoARS) provides an estimate of rock/debris that could fall from a slope – of a given height, angle, and area – at different levels of earthquake shaking.


Variable inputs
Tooltip icon for angle.
Tooltip icon for height.
Tooltip icon for horizontal PGA.
Tooltip icon for surface area.

Limitations and disclaimers

Calculation Output
Mean -1 Standard Deviation +1 Standard Deviation
Rockfall Rate (m³/m²)
Rockfall Volume (m³)