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Geomorphological Features of Holocene Landslides in the Pliocene-Quaternary Stratovolcano Massif of Sancy (France). During the entire Holocene period, the morphological changes of the Sancy stratovolcano were caused by various geomorphological processes and especially by landslides that affected mostly the slopes of the Pleistocene glacial valleys. The morphological features of three of the most important landslides situated in the stratified volcanic and sedimentary deposits have been analysed and described here using the aerial photo-interpretation, field observations and GIS treatments. The resulting map presents the geologic-geomorphologic settings in the areas affected by this type of process. In the case of Sancy, the morphological evidence suggests that a combination of certain factors such as the steep glacial valleys, decompression on slopes associated with the retreat of the Pleistocene glaciers, fractured lava flows, unconsolidated pyroclastic materials, hydrothermal alteration, etc. might have caused these landslides, in the absence of volcanic activity. In certain areas of the stratovolcano, the reactivation of such landslides may produce severe damage for the neighbouring human communities, as did happen, for example, in 2004 in the Mont Dore mountain resort.

Keywords: hollocene landslides, morphometry, dendrochronology, Mont Dore, Sancy stratovolcano (France).