Svennevig K., Hicks S. P., Forbriger T., Lecocq T., Widmer-Schnidrig R., Mangeney A., Hibert C., Korsgaard N. J., Lucas A., Satriano C., Anthony R. E., Mordret A., Schippkus S., Rysgaard S., Boone W., Gibbons S. J., Cook Kristen, Glimsdal S., Lovholt F., Van Noten K., Assink J. D., Marboeuf A., Lomax A., Vanneste K., Taira T., Spagnolo M., De Plaen R., Koelemeijer P., Ebeling C., Cannata A., Harcourt W. D., Cornwell D. G., Caudron C., Poli P., Bernard P., Larose E., Stutzmann E., Voss P. H., Lund B., Cannavo F., Castro-Díaz M. J., Chaves E., Dahl-Jensen T., Dias N. D., Déprez A., Develter R., Dreger D., Evers L. G., Fernández-Nieto E. D., Ferreira A. M. G., Funning G., Gabriel A. A., Hendrickx M., Kafka A. L., Keiding M., Kerby J., Khan S. A., Dideriksen A. K., Lamb O. D., Larsen T. B., Lipovsky B., Magdalena I., Malet J. P., Myrup M., Rivera L., Ruiz-Castillo E., Wetter S., Wirtz B. (2024). A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days. Science, 385 (6714), p. 1196-1205. ISSN 0036-8075.
Titre du document
A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 days
Année de publication
2024
Auteurs
Svennevig K., Hicks S. P., Forbriger T., Lecocq T., Widmer-Schnidrig R., Mangeney A., Hibert C., Korsgaard N. J., Lucas A., Satriano C., Anthony R. E., Mordret A., Schippkus S., Rysgaard S., Boone W., Gibbons S. J., Cook Kristen, Glimsdal S., Lovholt F., Van Noten K., Assink J. D., Marboeuf A., Lomax A., Vanneste K., Taira T., Spagnolo M., De Plaen R., Koelemeijer P., Ebeling C., Cannata A., Harcourt W. D., Cornwell D. G., Caudron C., Poli P., Bernard P., Larose E., Stutzmann E., Voss P. H., Lund B., Cannavo F., Castro-Díaz M. J., Chaves E., Dahl-Jensen T., Dias N. D., Déprez A., Develter R., Dreger D., Evers L. G., Fernández-Nieto E. D., Ferreira A. M. G., Funning G., Gabriel A. A., Hendrickx M., Kafka A. L., Keiding M., Kerby J., Khan S. A., Dideriksen A. K., Lamb O. D., Larsen T. B., Lipovsky B., Magdalena I., Malet J. P., Myrup M., Rivera L., Ruiz-Castillo E., Wetter S., Wirtz B.
Source
Science, 2024,
385 (6714), p. 1196-1205 ISSN 0036-8075
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 x 10(6) 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 x 10(11) 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.
Plan de classement
Sciences du milieu [021]
;
Limnologie physique / Océanographie physique [032]
;
Géologie et formations superficielles [064]
Description Géographique
GROENLAND
Localisation
Fonds IRD [F B010092819]
Identifiant IRD
fdi:010092819
