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dc.contributor.author Sánchez-Núñez, J. M.
dc.contributor.author Gómez Avalos, Juan Carlos
dc.contributor.author Macías, J. L.
dc.contributor.author Arce, J. L.
dc.coverage.spatial Cotahuasi river
dc.coverage.spatial Perú
dc.date.accessioned 2021-02-18T15:49:18Z
dc.date.available 2021-02-18T15:49:18Z
dc.date.issued 2020-12
dc.identifier.citation Sánchez-Núñez, J. M., Gómez, J. C., Macías, J. L. & Arce, J. L. (2020). Pleistocene rock avalanche, damming, and secondary debris flow along the Cotahuasi river, Peru.==$Journal of South American Earth Sciences, 104,$==102901. https://doi.org/10.1016/j.jsames.2020.102901 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/4925
dc.description.abstract Landslides are among the most frequent and dangerous mass removal processes around the globe. They can be triggered by different phenomena such as earthquakes, extraordinary rains, glacier outbursts, volcanic activity, among others. In this study, we reconstruct the origin and potential cause of a rock avalanche that occurred in the Cotahuasi canyon in southern Peru. The head-scarp is a cirque carved during the Last Glacial Maximum and is formed by Alpabamba ignimbrites and Upper Barroso Formation volcanics. Slope failure removed a minimum volume of 1.13 km³ generating a dry rock avalanche that was immediately confined into the Cachana valley, where it traveled 11 km downstream before reaching the Cotahuasi river. There, it did run for another 3 km towards the opposite Mungui mountains with minimum speeds of 72 m/s. The transversal Mungui range forced the avalanche to laterally spread upstream and downstream along the Cotahuasi river, as well as upstream the Pampamarca tributary prior to its final stop. The resulting deposit (H/L = 0.16) developed hummocky topography and formed a 10 km long and ≤100 m high dam that impounded two temporary lakes. At their maximum capacity, these lakes could hold ~1.6 × 108 m³ of water prior to overtopping the dam. The dam-breakout generated a catastrophic flood (massive layer forming terraces) that traveled for tens of kilometers and likely as far as the sea. The debris flow deposit could be well-documented up to a distance of 20 km from the breach with the presence of 4 to 50-m-thick terraces with a minimum volume of 0.72 km³. After this distance, the deposit disappears, likely due to post-emplacement erosion by the river itself. Considering the missing volume at the head-scarp cirque (~3.85 km³) and the sum of the minimum volumes of the rock avalanche and debris flow deposits (~1.85 km³), circa forty percent of the material must have been removed by glacial and fluviatile activity since the time of its original emplacement. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0895-9811
dc.rights info:eu-repo/semantics/closedAccess es_ES
dc.subject Geodynamics es_ES
dc.subject Debris avalanche es_ES
dc.subject Geology es_ES
dc.subject Paleoevents es_ES
dc.subject Radiometric dating es_ES
dc.subject Dry rock avalanche es_ES
dc.subject River dam es_ES
dc.subject Catastrophic debris flow es_ES
dc.title Pleistocene rock avalanche, damming, and secondary debris flow along the Cotahuasi river, Peru es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.00 es_ES
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.04 es_ES
dc.identifier.journal Journal of South American Earth Sciences es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1016/j.jsames.2020.102901 es_ES

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