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The Onsar Pass is a morphological accident separating the two parts of the El Haouz limestone chain. The nature and origin of this pass are related to the tectonic setting and the recent geomorphological evolution. Through an intense deformation, it constitutes a corridor of weakened materials which results in phenomena of instability that range from sagging and rockfalls in the karstic carbonate formations to creeping phenomena and flows in the underlying schistouse and marly formations. In this regard, a village bearing the same name as the pass witnessed rockfalls in the winter of 1946 and 1963 which caused the loss of life and goods. The basement of the village is an old accumulation of blocks, and the presence of signs of instability attests to the persistent risk in this site. This event as well as its aftermath are not an isolated case. In fact, an inventory made in the surrounding of the Onsar Pass has shown the presence of numerous and varied slope movements. Therefore, this process generalize this unstable environment to the entire area of the pass, the origin and mechanism of which can be explained by the geological context, which is particularly complex.

Écroulements et mouvements de versants associés au niveau du col de Onsar (Rif, Maroc) dans un contexte géologique de décrochement