Paleo-Tsunami por deslizamientos submarinos en márgenes glaciares: el caso del abanico glacial de Storfjorden (SO del Archipiélago Svalbard)

• Main Authors: Pedrosa-González, María Teresa, Ercilla, Gemma, Galindo Zaldívar, Jesús, González-Vida, José Manuel, Ortega-Acosta, Sergio
• Format: Conference Object
• Language: Spanish
• Published: Sociedad Geológica de España 2021
• Subjects: Márgenes continentales polares; Deslizamientos submarinos; Modelización de tsunamis; Alta; Gonzalez; Svalbard; Svalbard Archipelago; Isla del Oso; Storfjorden; Spitsbergen
• Online Access: http://hdl.handle.net/10261/264036

X Congreso Geológico de España, 5-7 de julio 2021, Vitoria-Gasteiz.-- 1 page [EN] The Storfjorden Trough Mouth Fan is affected by a huge submarine landslide mapped based on multibeam bathymetry and very high-resolution seismic profiles. The Storfjorden landslide covers an area of 1200 km2 with a volume of 40 km3. The Landslide-HySEA numerical modelling has simulated the hypothetical tsunami (Gonzalez-Vida et al., 2019). The model related landslide evidences the presence of two interacting sediment volumes, which are slumping simultaneously. Wave trains values are one meter with N-S propagation direction and run-up value ~ 2m in Spitsbergen and Bear Islands. Sedimentary instability would be related to i) the interplay between the over-steeping of the continental slope (4º), ii) the high sedimentation rates of clays during interglacial periods, which are intercalated with glaciogenic sediments deposited during the glacial periods building a stratigraphy with over-consolidated clay levels, iii) and the seismic activity (Faleide et al, 1996). It contributes to increase the knowledge and the evaluation about the potential tsunamigenic of submarine landslides in similar scenarios, where the environmental changes by impact of climatic changes may favour submarine landslide triggering [ES] El abanico de Storfjorden está afectado por un gran deslizamiento submarino identificado en la batimetría multihaz y perfiles sísmicos de muy alta resolución. El deslizamiento de Storfjorden cubre un área de 1200 km2 con un volumen de 40 km 3. Se ha realizado la simulación del deslizamiento mediante el modelo numérico Landslide-HySEA (González-Vida et al., 2019). El análisis del deslizamiento proporciona evidencia de la presencia de dos volúmenes de sedimentos interactivos, que se desploman simultáneamente. El tsunami comprende trenes de olas de 1 m de amplitud que se dispersan hacia N-S, afectando las costas de Spitsbergen y la Isla del Oso con olas ~ 2 m. La inestabilidad sedimentaria que desencadena el tsunami podría estar ...