Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska
Shallow ice-bonded permafrost has been shown by seismic refraction methods to exist beneath several islands in the Beaufort Sea. The marked contrast of seismic velocities in bonded materials (>2500 m/sec) and unbonded materials (<2100 m/sec) was used to determine the location of permafrost. In...
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The Arctic Institute of North America
1981
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ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/65570 2023-05-15T14:19:17+02:00 Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska Morack, J.L. Rogers, J.C. 1981-01-01 application/pdf https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570 eng eng The Arctic Institute of North America https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570/49484 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570 ARCTIC; Vol. 34 No. 2 (1981): June: 103–198; 169-174 1923-1245 0004-0843 Barrier islands Permafrost Permafrost beneath oceans Seismic surveys Spatial distribution Alaska Northern Alaskan Beaufort Sea info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 1981 ftunivcalgaryojs 2022-03-22T21:22:40Z Shallow ice-bonded permafrost has been shown by seismic refraction methods to exist beneath several islands in the Beaufort Sea. The marked contrast of seismic velocities in bonded materials (>2500 m/sec) and unbonded materials (<2100 m/sec) was used to determine the location of permafrost. In many cases these data were confirmed by shallow probing and drill holes. Several general conclusions are made about the distribution of shallow bonded permafrost beneath islands in the Beaufort Sea. Shallow permafrost occurs under areas where remnants of tundra still exist. These conditions exist on the larger islands that have not been eroded away by the ocean. Islands which have been eroded by the ocean, leaving only accumulation of sand and gravel, are generally moving westward and landward and for the most part are not underlain by shallow permafrost. However, the oldest and most persistent parts of these islands are in some cases underlain by shallow permafrost. This is believed to be a consequence of repeated freezings and thawings causing a reduction of salt brine in the sediments and allowing the materials to freeze. Article in Journal/Newspaper Arctic Beaufort Sea Ice permafrost Tundra Alaska University of Calgary Journal Hosting Barrier Islands ENVELOPE(-92.283,-92.283,62.784,62.784) ARCTIC 34 2 |
institution |
Open Polar |
collection |
University of Calgary Journal Hosting |
op_collection_id |
ftunivcalgaryojs |
language |
English |
topic |
Barrier islands Permafrost Permafrost beneath oceans Seismic surveys Spatial distribution Alaska Northern Alaskan Beaufort Sea |
spellingShingle |
Barrier islands Permafrost Permafrost beneath oceans Seismic surveys Spatial distribution Alaska Northern Alaskan Beaufort Sea Morack, J.L. Rogers, J.C. Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
topic_facet |
Barrier islands Permafrost Permafrost beneath oceans Seismic surveys Spatial distribution Alaska Northern Alaskan Beaufort Sea |
description |
Shallow ice-bonded permafrost has been shown by seismic refraction methods to exist beneath several islands in the Beaufort Sea. The marked contrast of seismic velocities in bonded materials (>2500 m/sec) and unbonded materials (<2100 m/sec) was used to determine the location of permafrost. In many cases these data were confirmed by shallow probing and drill holes. Several general conclusions are made about the distribution of shallow bonded permafrost beneath islands in the Beaufort Sea. Shallow permafrost occurs under areas where remnants of tundra still exist. These conditions exist on the larger islands that have not been eroded away by the ocean. Islands which have been eroded by the ocean, leaving only accumulation of sand and gravel, are generally moving westward and landward and for the most part are not underlain by shallow permafrost. However, the oldest and most persistent parts of these islands are in some cases underlain by shallow permafrost. This is believed to be a consequence of repeated freezings and thawings causing a reduction of salt brine in the sediments and allowing the materials to freeze. |
format |
Article in Journal/Newspaper |
author |
Morack, J.L. Rogers, J.C. |
author_facet |
Morack, J.L. Rogers, J.C. |
author_sort |
Morack, J.L. |
title |
Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
title_short |
Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
title_full |
Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
title_fullStr |
Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
title_full_unstemmed |
Seismic Evidence of Shallow Permafrost Beneath Islands in the Beaufort Sea, Alaska |
title_sort |
seismic evidence of shallow permafrost beneath islands in the beaufort sea, alaska |
publisher |
The Arctic Institute of North America |
publishDate |
1981 |
url |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570 |
long_lat |
ENVELOPE(-92.283,-92.283,62.784,62.784) |
geographic |
Barrier Islands |
geographic_facet |
Barrier Islands |
genre |
Arctic Beaufort Sea Ice permafrost Tundra Alaska |
genre_facet |
Arctic Beaufort Sea Ice permafrost Tundra Alaska |
op_source |
ARCTIC; Vol. 34 No. 2 (1981): June: 103–198; 169-174 1923-1245 0004-0843 |
op_relation |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570/49484 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65570 |
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ARCTIC |
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34 |
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2 |
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1766290935847583744 |