“…The geomorphology of Lake Chambon may thus result from the progressive development of the Chaudefour delta in a lacustrine basin dammed by two successive landslides originating from the Dent du Marais area during the Late Holocene. Rockfalls and landslides in glacial or volcanic valleys are generally favoured by active tectonic setting and environmental changes following deglaciations (Macaire et al, 1992;Vidal et al, 1996;Schneider et al, 2004;Deplazes et al, 2007;Nepop and Agatova (2016); Defive et al, 2019) and can result either from earthquakes, volcanism, fluvial incision, heavy rainfalls and freeze-thaw cycles, or a combination of these factors. The Dent du Marais landslide is the largest of the MCF and is located above the Jassat fault (Vidal et al, 1996) at the edge of the Late-Glacial Tartaret stratovolcano (Fig.…”