@article{discovery10196971, journal = {Science}, title = {A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days}, year = {2024}, publisher = {American Association for the Advancement of Science (AAAS)}, pages = {1196--1205}, note = {This version is the author-accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.}, volume = {385}, number = {6714}, month = {September}, author = {Svennevig, Kristian and Hicks, Stephen P and Forbriger, Thomas and Lecocq, Thomas and Widmer-Schnidrig, Rudolf and Mangeney, Anne and Hibert, Cl{\'e}ment and Korsgaard, Niels J and Lucas, Antoine and Satriano, Claudio and Anthony, Robert E and Mordret, Aur{\'e}lien and Schippkus, Sven and Rysgaard, S{\o}ren and Boone, Wieter and Gibbons, Steven J and Cook, Kristen L and Glimsdal, Sylfest and L{\o}vholt, Finn and Van Noten, Koen and Assink, Jelle D and Marboeuf, Alexis and Lomax, Anthony and Vanneste, Kris and Taira, Taka'aki and Spagnolo, Matteo and De Plaen, Raphael and Koelemeijer, Paula and Ebeling, Carl and Cannata, Andrea and Harcourt, William D and Cornwell, David G and Caudron, Corentin and Poli, Piero and Bernard, Pascal and Larose, Eric and Stutzmann, Eleonore and Voss, Peter H and Lund, Bjorn and Cannavo, Flavio and Castro-D{\'i}az, Manuel J and Chaves, Esteban and Dahl-Jensen, Trine and Pinho Dias, Nicolas De and D{\'e}prez, Aline and Develter, Roeland and Dreger, Douglas and Evers, L{\"a}slo G and Fern{\'a}ndez-Nieto, Enrique D and Ferreira, Ana MG and Funning, Gareth and Gabriel, Alice-Agnes and Hendrickx, Marc and Kafka, Alan L and Keiding, Marie and Kerby, Jeffrey and Khan, Shfaqat A and Dideriksen, Andreas Kj{\ae}r and Lamb, Oliver D and Larsen, Tine B and Lipovsky, Bradley and Magdalena, Ikha and Malet, Jean-Philippe and Myrup, Mikkel and Rivera, Luis and Ruiz-Castillo, Eugenio and Wetter, Selina and Wirtz, Bastien}, issn = {0036-8075}, url = {https://doi.org/10.1126/science.adm9247}, 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 {$\times$} 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 {$\times$} 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.} }