Figure 9. Lake Palcacocha. (A) Lake Palcacocha in 1932, 9 years before dam failure (photo taken by Hanz Kinzl and reproduced by Vilímek et al., 2005). (B) An aerial view of Lake Palcacocha in 1948, 7 years after dam failure, with the current lake extent indicated by a blue line. (C) The failed moraine dam with an outwash fan; the moraine is approximately 160 m high. (D) Lake Palcacocha in 2016, seen from the moraine crest; two artificial dams built in the 1970s to prevent (mitigate) lake outburst floods (see “GLOF Risk Management”) are visible at the front. Photos (C) and (D): Author.