Giant landslides in the foreland of the Patagonian Ice Sheet

Large landslides cluster at the margin of a deglaciated mountain belt

“…Furthermore, landslide clusters at 43° and between 47°and 51° spatially coincide with the existence of large glacial lakes, which expanded between ~ 18 and 10 ka 22 . The coincidence in time between the existence of glacial lakes and the formation of some of the largest landslides in the PIS around Lago Buenos Aires and Lago Pueyerredón has been reported by Pánek et al 49 . Cross-cutting relationships of landslides with paleoshorelines suggest that some landslides originated during rapid drawdowns of glacial lakes due to their catastrophic drainages to the Pacific Ocean 35 .…”

“…This scenario would be consistent with the so-called exhaustion paraglacial model of Cruden and Hu 48 , which assumes that deglaciated areas contain a finite number of potential failure sites, the number of which is progressively reduced over time. However, radiometrically dated landslides are few in Patagonia and have occurred both just after deglaciation 49 and with a lag of many millennia 38 , so an extensive dating campaign of Patagonian landslides will be needed to verify whether the "exhaustion model" is valid in the region.…”

“…In contrast, the eastern margin of the PIS region is dominated by large landslides in weak rocks. These landslides are mostly ancient and recent landslide activity is limited here 49 . We assume that these large landslides were triggered mainly due to high-magnitude events in the transient period after deglaciation, e.g.…”

70 years of lake evolution and glacial lake outburst floods in the Cordillera Blanca (Peru) and implications for the future

“…Lake Librón which may have existed before the LIA). Examples of GRT in order of 10 3 years were reported from the Patagonian Andes (Pánek et al, 2018). Further, our dataset shows four examples of lakes which produced GLOFs following the period of the most rapid glacier retreat and lake growth.…”

Glacial geomorphology of the Strait of Magellan ice lobe, southernmost Patagonia, South America

“…Moreover, recent works have also reported large rotational landslides associated with glacial landscapes in central Patagonia (Pánek, Korup, Lenart, Hradecký, & Břežný, 2018). Flowslides are characterized by the presence of a semi-circular scarps on the headwalls of mass-wasting deposits with signs of downslope flow, such as transverse crevasses and ridges (Figure 6).…”