Rock Fall. Image by Fausto Guzetti, distributed by EGU under a Creative Commons licence.
The photograph shows a rock fall occurred near Valtopina, Umbria, Central Italy, at an unknown date.
Rockfalls are a mass movement hazard. They mostly occur on steep rock faces, with the blocks that fall detaching along an existing weakness. The scale of a rock fall can range from a few blocks of rock to rock avalanches. Rock falls can be triggered by earthquakes, freeze-thaw or no apparent cause.
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