気候変動などによる氷河の変化をより正確に予測するための研究 Research could help more accurately predict how glaciers will change in the future due to climate change and other factors
2022-05-04 ミネソタ大学
この情報は、科学者が将来の氷河の大きさをより正確に予測し、氷河と地滑りの両方が存在する地域に住むことのリスクをよりよく理解するのに役立つと考えられます。
この研究は、米国地質学会が発行する査読付き地球科学雑誌「Geology」に掲載されています。
＜関連情報＞
- https://cse.umn.edu/college/news/study-finds-landslides-can-have-major-impact-glacier-melt-and-movement
- https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G49854.1/613387/Atypical-landslide-induces-speedup-advance-and
非定型地すべりによる潮流氷河の加速・前進・長期減速の誘発 Atypical landslide induces speedup, advance, and long-term slowdown of a tidewater glacier
Maximillian Van Wyk de Vries;Andrew D. Wickert;Kelly R. MacGregor;Camilo Rada;Michael J. Willis
Geology Published:April 26, 2022
DOI:https://doi.org/10.1130/G49854.1
Abstract
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.
