Atypical landslide induces speedup, advance, and long-term slowdown of a tidewater glacier
| العنوان: | Atypical landslide induces speedup, advance, and long-term slowdown of a tidewater glacier |
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| المؤلفون: | Maximillian Van Wyk de Vries, Andrew D. Wickert, Kelly R. MacGregor, Camilo Rada, Michael J. Willis |
| المصدر: | Geology. |
| بيانات النشر: | Geological Society of America, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Geology |
| الوصف: | Atmospheric and oceanic warming over the past century have driven rapid glacier thinning and retreat, destabilizing hillslopes and increasing the frequency of landslides. The impact of these landslides on glacier dynamics and resultant secondary landslide hazards are not fully understood. We investigated how a 262 ± 77 × 106 m3 landslide affected the flow of Amalia Glacier, Chilean Patagonia. Despite being one of the largest recorded landslides in a glaciated region, it emplaced little debris onto the glacier surface. Instead, it left a series of landslide-perpendicular ridges, landslide-parallel fractures, and an apron of ice debris—with blocks as much as 25 m across. Our observations suggest that a deep-seated failure of the mountainside impacted the glacier flank, propagating brittle deformation through the ice and emplacing the bulk of the rock mass below the glacier. The landslide triggered a brief downglacier acceleration of Amalia Glacier followed by a slowdown of as much as 60% of the pre-landslide speed and increased suspended-sediment concentrations in the fjord. These results highlight that landslides may induce widespread and long-lasting disruptions to glacier dynamics. |
| تدمد: | 1943-2682 0091-7613 |
| DOI: | 10.1130/g49854.1 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::4b4405fc92be906a80e47c620e1da87f https://doi.org/10.1130/g49854.1 |
| رقم الانضمام: | edsair.doi...........4b4405fc92be906a80e47c620e1da87f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19432682 00917613 |
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| DOI: | 10.1130/g49854.1 |