TY - JOUR JF - Science PB - American Association for the Advancement of Science (AAAS) ID - discovery10196971 SP - 1196 AV - public A1 - Svennevig, Kristian A1 - Hicks, Stephen P A1 - Forbriger, Thomas A1 - Lecocq, Thomas A1 - Widmer-Schnidrig, Rudolf A1 - Mangeney, Anne A1 - Hibert, Clément A1 - Korsgaard, Niels J A1 - Lucas, Antoine A1 - Satriano, Claudio A1 - Anthony, Robert E A1 - Mordret, Aurélien A1 - Schippkus, Sven A1 - Rysgaard, Søren A1 - Boone, Wieter A1 - Gibbons, Steven J A1 - Cook, Kristen L A1 - Glimsdal, Sylfest A1 - Løvholt, Finn A1 - Van Noten, Koen A1 - Assink, Jelle D A1 - Marboeuf, Alexis A1 - Lomax, Anthony A1 - Vanneste, Kris A1 - Taira, Taka?aki A1 - Spagnolo, Matteo A1 - De Plaen, Raphael A1 - Koelemeijer, Paula A1 - Ebeling, Carl A1 - Cannata, Andrea A1 - Harcourt, William D A1 - Cornwell, David G A1 - Caudron, Corentin A1 - Poli, Piero A1 - Bernard, Pascal A1 - Larose, Eric A1 - Stutzmann, Eleonore A1 - Voss, Peter H A1 - Lund, Bjorn A1 - Cannavo, Flavio A1 - Castro-Díaz, Manuel J A1 - Chaves, Esteban A1 - Dahl-Jensen, Trine A1 - Pinho Dias, Nicolas De A1 - Déprez, Aline A1 - Develter, Roeland A1 - Dreger, Douglas A1 - Evers, Läslo G A1 - Fernández-Nieto, Enrique D A1 - Ferreira, Ana MG A1 - Funning, Gareth A1 - Gabriel, Alice-Agnes A1 - Hendrickx, Marc A1 - Kafka, Alan L A1 - Keiding, Marie A1 - Kerby, Jeffrey A1 - Khan, Shfaqat A A1 - Dideriksen, Andreas Kjær A1 - Lamb, Oliver D A1 - Larsen, Tine B A1 - Lipovsky, Bradley A1 - Magdalena, Ikha A1 - Malet, Jean-Philippe A1 - Myrup, Mikkel A1 - Rivera, Luis A1 - Ruiz-Castillo, Eugenio A1 - Wetter, Selina A1 - Wirtz, Bastien UR - https://doi.org/10.1126/science.adm9247 IS - 6714 TI - A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days Y1 - 2024/09/13/ N1 - This version is the author-accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. EP - 1205 SN - 0036-8075 N2 - 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. VL - 385 ER -