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Artículo

Subaqueous landslides at the distal basin of Lago Nahuel Huapi (Argentina): Towards a tsunami hazard evaluation in Northern Patagonian lakes

Beigt, DeboraIcon ; Villarosa, GustavoIcon ; Gomez, Eduardo AlbertoIcon ; Manzoni, CarolinaIcon
Fecha de publicación: 07/06/2016
Editorial: Elsevier Science
Revista: Geomorphology
ISSN: 0169-555X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Oceanografía, Hidrología, Recursos Hídricos

Resumen

The May 22nd, 1960 Valdivia earthquake, Chile (Mw 9.5) triggered a series of subaqueous mass-wasting processes (debris flows and slides) in Lago Nahuel Huapi (Argentina), generating a tsunami-like wave that hit the coasts of San Carlos de Bariloche. Aiming to provide a first preliminary insight into tsunami hazards for the lakeshore communities, in this paper we identify and characterize the subaqueous landslides at the populated distal basin of the lake. Swath bathymetric and seismic profiling surveys were carried out and high-resolution digital elevation models were derived from these data to perform a landslide inventory map. A series of morphometrical parameters (including the landslide area, the volume of displaced materials and the run-out distance, among others) were estimated upon selected events. The results indicated that landslide activity at the distal basin of Lago Nahuel Huapi has been concentrated in the vicinity of Bariloche (massive landslide triggered by the 1960 earthquake) and within steep delta fronts where the slope failures typically initiate at shallow waters (9–11 m depth). The sliding mass frequently travels basinward along a great distance (≥1000 m). At the delta fronts, the volume of material removed by landslides can reach ~40 × 104 m3 , leaving scar areas of up to 13 m thick. The periodic occurrence of rotational–translational mass movements initiating at the upper edge of the delta fronts, with vertical displacements of the mobilized materials reaching ~200 m, probably represents a potential tsunami hazard for the nearby populated coasts.
Palabras clave: Lacustrine Deltas , Lago Nahuel Huapi , Subaqueous Landslides , Tsunami Hazard
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info:eu-repo/semantics/embargoedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/25344
DOI: http://dx.doi.org/10.1016/j.geomorph.2016.06.004
URL: http://www.sciencedirect.com/science/article/pii/S0169555X16304421
Colecciones
Articulos(IADO)
Articulos de INST.ARG.DE OCEANOGRAFIA (I)
Articulos(IPATEC)
Articulos de INSTITUTO ANDINO PATAGONICO DE TECNOLOGIAS BIOLOGICAS Y GEOAMBIENTALES
Citación
Beigt, Debora; Villarosa, Gustavo; Gomez, Eduardo Alberto; Manzoni, Carolina; Subaqueous landslides at the distal basin of Lago Nahuel Huapi (Argentina): Towards a tsunami hazard evaluation in Northern Patagonian lakes; Elsevier Science; Geomorphology; 268; 07-6-2016; 197-206
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