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
Geological Survey of Denmark and Greenland, Copenhagen, Denmark.
Department of Earth Sciences, University College London, London, UK.
Science. 2024 Sep 13;385(6714):1196-1205. doi: 10.1126/science.adm9247. Epub 2024 Sep 12.
Climate change is increasingly predisposing polar regions to large landslides. Tsunamigenic landslides have occurred recently in Greenland (), 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 × 10 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 × 10 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.
气候变化正使极地地区越来越容易发生大型山体滑坡。近期在格陵兰岛发生了可能引发海啸的山体滑坡（），但东部峡湾地区尚未有相关报告。2023年9月，我们探测到一个为期9天、全球范围的10.88毫赫兹（92秒）单色超长周期（VLP）地震信号的起始，其源自东格陵兰岛。在本研究中，我们展示了该事件是如何始于一次由冰川变薄引发的25×10立方米岩石 - 冰体雪崩，雪崩冲入迪克森峡湾，引发了一场200米高的海啸。模拟显示，海啸稳定形成了一个7米高的长时间驻波，其频率（11.45毫赫兹）和缓慢的振幅衰减与地震信号几乎相同。一个最大振幅为5×10牛顿的振荡、峡湾横向单力重现了地震振幅及其相对于峡湾的辐射模式，表明了驻波是如何直接导致了这个为期9天的地震信号。我们的研究结果凸显了气候变化如何在冰冻圈、水圈和岩石圈之间引发连锁的危险反馈。
