In Normandy, along the Calvados coast, 50 km of cliffs are periodically affected by landslides for several centuries. On the eastern side of the coast, the 12 km of the Pays d’Auge section between Trouville-sur-Mer and Honfleur, has been particularly affected. Two spectacular landslides are investigated since almost 30 years: the "Fosses du Macre" and the "Cirque des Graves" landslides near the municipality of Villerville-Cricqueboeuf.
Location of the Villerville-Cricqueboeuf landslides and of the monitoring networks
Aerial view to the West on the Villerville-Cricqueboeuf landslides (1988)
The Pays d’Auge plateau is bordered in the North by high cliffs of up to 140 m. The topography and geology of the cliffs is inhomogeneous. The main scarp is composed of chalk overlying sands. Below, a thick series of marls on top of sandy limestone shape the cliff toe and constitute a flat rocky reef between Trouville and the Pointe du Heurt. Below the scarp, the slope is more gentle and relatively straight. It is composed of blocks and debris of chalk and flints as well as loess which fill the voids between the chalk blocks. These formations have been placed during the Upper Pleistocene period.
Morphological setting of the Pays d'Auge cliffs
Geological profile of the present coastal slope of Villerville
- More information on the landslide history: here
- More information on the landslide kinematics: here
- More information on the landslide structure: here
Since the 1980’s, the landslides are investigated by the University of Caen-Basse-Normandie (Laboratory LETG/Geophen), in coordination, sicen 2007, with the School and Observatory of Earth Sciences, Institute of Earth Physics (Strasbourg).lien
The Villerville landslide has been the subject of many research studies and several PhD or post-doc projects:
- Maquaire, O. 1990. Les mouvements de terrain de la côte du Calvados. Recherches et prévention. Documents du B.R.G.M., n° 197. Editions du B.R.G.M., 430 p. [pdf]
Full access to the publications (ISI Journals, Books, Conference Proceedings, PhD and MSc thesis) referring to the Super-Sauze landslide are available here