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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days Svennevig, Kristian; Hicks, Stephen P.; Forbriger, Thomas; Lecocq, Thomas; Widmer-Schnidrig, Rudolf; Mangeney, Anne; Hibert, Clément; Korsgaard, Niels J.; Lucas, Antoine; Satriano, Claudio; Anthony, Robert E.; Mordret, Aurélien; Schippkus, Sven; Rysgaard, Søren; Boone, Wieter; Gibbons, Steven J.; Cook, Kristen L.; Glimsdal, Sylfest; Løvholt, Finn; Van Noten, Koen; Assink, Jelle D.; Marboeuf, Alexis; Lomax, Anthony; Vanneste, Kris; Taira, Taka’aki; Spagnolo, Matteo; De Plaen, Raphael; Koelemeijer, Paula; Ebeling, Carl; Cannata, Andrea; Harcourt, William D.; Cornwell, David G.; Caudron, Corentin; Poli, Piero; Bernard, Pascal; Larose, Eric; Stutzmann, Eleonore; Voss, Peter H.; Lund, Bjorn; Cannavo, Flavio; Castro-Díaz, Manuel J.; Chaves, Esteban; Dahl-Jensen, Trine; Pinho Dias, Nicolas De; Déprez, Aline; Develter, Roeland; Dreger, Douglas; Evers, Läslo G.; Fernández-Nieto, Enrique D.; Ferreira, Ana M. G.; Funning, Gareth; Gabriel, Alice-Agnes; Hendrickx, Marc; Kafka, Alan L.; Keiding, Marie; Kerby, Jeffrey; Khan, Shfaqat A.; Dideriksen, Andreas Kjær; Lamb, Oliver D.; Larsen, Tine B.; Lipovsky, Bradley; Magdalena, Ikha; Malet, Jean-Philippe; Myrup, Mikkel; Rivera, Luis; Ruiz-Castillo, Eugenio; Wetter, Selina; Wirtz, Bastien (2024). A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days. Science (Wash.) 385(6714): 1196-1205. https://dx.doi.org/10.1126/science.adm9247 In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer

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VLIZ: Open access 408976 [ download pdf ] VLIZ: Non-open access 408971 [ aanvragen ]

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Lecocq, T., meer Boone, W., meer Van Noten, K.	Vanneste, K., meer Caudron, C., meer Develter, R., meer

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Abstract

Climate change is increasingly predisposing polar regions to large landslides. Tsunamigenic landslides have occurred recently in Greenland (Kalaallit Nunaat), but none have been reported from the eastern fjords. In September 2023, we detected the start of a 9-day-long, global 10.88-millihertz (92-second) monochromatic very-long-period (VLP) seismic signal, originating from East Greenland. In this study, we demonstrate how this event started with a glacial thinning–induced rock-ice avalanche of 25 × 106 cubic meters plunging into Dickson Fjord, triggering a 200-meter-high tsunami. Simulations show that the tsunami stabilized into a 7-meter-high long-duration seiche with a frequency (11.45 millihertz) and slow amplitude decay that were nearly identical to the seismic signal. An oscillating, fjord-transverse single force with a maximum amplitude of 5 × 1011 newtons reproduced the seismic amplitudes and their radiation pattern relative to the fjord, demonstrating how a seiche directly caused the 9-day-long seismic signal. Our findings highlight how climate change is causing cascading, hazardous feedbacks between the cryosphere, hydrosphere, and lithosphere.

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