Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada
Abstract Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment...
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crwiley:10.1002/ppp.578 2024-09-15T18:04:46+00:00 Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada Lewkowicz, Antoni G. 2007 http://dx.doi.org/10.1002/ppp.578 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.578 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.578 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 18, issue 1, page 89-103 ISSN 1045-6740 1099-1530 journal-article 2007 crwiley https://doi.org/10.1002/ppp.578 2024-09-05T05:04:45Z Abstract Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment but over several days its front propagated 250 m downslope at velocities of 2–9 m h −1 . A second, smaller active‐layer detachment developed within less than 2 hours and subsequent movement was limited. Effective stress analyses can explain the initiation of these landslides on moderate gradients. Movements across extremely low‐angled slope segments, however, likely require both dynamic loading from the moving mass and very low basal undrained shear strengths produced by high porewater pressures. The lengthy development of the large active‐layer detachment helps explain stratigraphic and morphologic features previously observed in these slope failures. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ellesmere Island Fosheim Peninsula Nunavut Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 18 1 89 103 |
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Wiley Online Library |
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English |
description |
Abstract Dozens of fresh active‐layer detachments were observed on the Fosheim Peninsula in late‐summer 2005 following one week of high air temperatures and nearly continuous bright sunshine. One of these shallow translational landslides started as a minor movement on an upper, steeper slope segment but over several days its front propagated 250 m downslope at velocities of 2–9 m h −1 . A second, smaller active‐layer detachment developed within less than 2 hours and subsequent movement was limited. Effective stress analyses can explain the initiation of these landslides on moderate gradients. Movements across extremely low‐angled slope segments, however, likely require both dynamic loading from the moving mass and very low basal undrained shear strengths produced by high porewater pressures. The lengthy development of the large active‐layer detachment helps explain stratigraphic and morphologic features previously observed in these slope failures. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Lewkowicz, Antoni G. |
spellingShingle |
Lewkowicz, Antoni G. Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
author_facet |
Lewkowicz, Antoni G. |
author_sort |
Lewkowicz, Antoni G. |
title |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_short |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_full |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_fullStr |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_full_unstemmed |
Dynamics of active‐layer detachment failures, Fosheim Peninsula, Ellesmere Island, Nunavut, Canada |
title_sort |
dynamics of active‐layer detachment failures, fosheim peninsula, ellesmere island, nunavut, canada |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/ppp.578 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.578 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.578 |
genre |
Ellesmere Island Fosheim Peninsula Nunavut Permafrost and Periglacial Processes |
genre_facet |
Ellesmere Island Fosheim Peninsula Nunavut Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 18, issue 1, page 89-103 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.578 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
18 |
container_issue |
1 |
container_start_page |
89 |
op_container_end_page |
103 |
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1810442384296640512 |