Post-glacial sea-level change along the Pacific coast of North America
Sea-level history since the Last Glacial Maximum on the Pacific margin of North America is complex and heterogeneous owing to regional differences in crustal deformation (neotectonics), changes in global ocean volumes (eustasy) and the depression and rebound of the Earth's crust in response to...
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2014
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ftuniwashingtaco:oai:digitalcommons.tacoma.uw.edu:ias_pub-1338 2023-09-05T13:20:18+02:00 Post-glacial sea-level change along the Pacific coast of North America Shugar, Dan H. Walker, Ian J. Lian, Olav B. Eamer, Jordan BR Neudorf, Christina McLaren, Duncan Fedje, Daryl 2014-08-01T07:00:00Z application/pdf https://digitalcommons.tacoma.uw.edu/ias_pub/339 https://digitalcommons.tacoma.uw.edu/context/ias_pub/article/1338/viewcontent/Shugar_02_2014.pdf unknown UW Tacoma Digital Commons https://digitalcommons.tacoma.uw.edu/ias_pub/339 https://digitalcommons.tacoma.uw.edu/context/ias_pub/article/1338/viewcontent/Shugar_02_2014.pdf SIAS Faculty Publications Relative sea level Isostasy Neotectonics Coastal geomorphology Cascadia Holocene glaciation text 2014 ftuniwashingtaco 2023-08-21T14:13:55Z Sea-level history since the Last Glacial Maximum on the Pacific margin of North America is complex and heterogeneous owing to regional differences in crustal deformation (neotectonics), changes in global ocean volumes (eustasy) and the depression and rebound of the Earth's crust in response to ice sheets on land (isostasy). At the Last Glacial Maximum, the Cordilleran Ice Sheet depressed the crust over which it formed and created a raised forebulge along peripheral areas offshore. This, combined with different tectonic settings along the coast, resulted in divergent relative sea-level responses during the Holocene. For example, sea level was up to 200 m higher than present in the lower Fraser Valley region of southwest British Columbia, due largely to isostatic depression. At the same time, sea level was 150 m lower than present in Haida Gwaii, on the northern coast of British Columbia, due to the combined effects of the forebulge raising the land and lower eustatic sea level. A forebulge also developed in parts of southeast Alaska resulting in post-glacial sea levels at least 122 m lower than present and possibly as low as 165 m. On the coasts of Washington and Oregon, as well as south-central Alaska, neotectonics and eustasy seem to have played larger roles than isostatic adjustments in controlling relative sea-level changes. Text Ice Sheet Alaska University of Washington: UW Tacoma Digital Commons Pacific |
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University of Washington: UW Tacoma Digital Commons |
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ftuniwashingtaco |
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topic |
Relative sea level Isostasy Neotectonics Coastal geomorphology Cascadia Holocene glaciation |
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Relative sea level Isostasy Neotectonics Coastal geomorphology Cascadia Holocene glaciation Shugar, Dan H. Walker, Ian J. Lian, Olav B. Eamer, Jordan BR Neudorf, Christina McLaren, Duncan Fedje, Daryl Post-glacial sea-level change along the Pacific coast of North America |
topic_facet |
Relative sea level Isostasy Neotectonics Coastal geomorphology Cascadia Holocene glaciation |
description |
Sea-level history since the Last Glacial Maximum on the Pacific margin of North America is complex and heterogeneous owing to regional differences in crustal deformation (neotectonics), changes in global ocean volumes (eustasy) and the depression and rebound of the Earth's crust in response to ice sheets on land (isostasy). At the Last Glacial Maximum, the Cordilleran Ice Sheet depressed the crust over which it formed and created a raised forebulge along peripheral areas offshore. This, combined with different tectonic settings along the coast, resulted in divergent relative sea-level responses during the Holocene. For example, sea level was up to 200 m higher than present in the lower Fraser Valley region of southwest British Columbia, due largely to isostatic depression. At the same time, sea level was 150 m lower than present in Haida Gwaii, on the northern coast of British Columbia, due to the combined effects of the forebulge raising the land and lower eustatic sea level. A forebulge also developed in parts of southeast Alaska resulting in post-glacial sea levels at least 122 m lower than present and possibly as low as 165 m. On the coasts of Washington and Oregon, as well as south-central Alaska, neotectonics and eustasy seem to have played larger roles than isostatic adjustments in controlling relative sea-level changes. |
format |
Text |
author |
Shugar, Dan H. Walker, Ian J. Lian, Olav B. Eamer, Jordan BR Neudorf, Christina McLaren, Duncan Fedje, Daryl |
author_facet |
Shugar, Dan H. Walker, Ian J. Lian, Olav B. Eamer, Jordan BR Neudorf, Christina McLaren, Duncan Fedje, Daryl |
author_sort |
Shugar, Dan H. |
title |
Post-glacial sea-level change along the Pacific coast of North America |
title_short |
Post-glacial sea-level change along the Pacific coast of North America |
title_full |
Post-glacial sea-level change along the Pacific coast of North America |
title_fullStr |
Post-glacial sea-level change along the Pacific coast of North America |
title_full_unstemmed |
Post-glacial sea-level change along the Pacific coast of North America |
title_sort |
post-glacial sea-level change along the pacific coast of north america |
publisher |
UW Tacoma Digital Commons |
publishDate |
2014 |
url |
https://digitalcommons.tacoma.uw.edu/ias_pub/339 https://digitalcommons.tacoma.uw.edu/context/ias_pub/article/1338/viewcontent/Shugar_02_2014.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet Alaska |
genre_facet |
Ice Sheet Alaska |
op_source |
SIAS Faculty Publications |
op_relation |
https://digitalcommons.tacoma.uw.edu/ias_pub/339 https://digitalcommons.tacoma.uw.edu/context/ias_pub/article/1338/viewcontent/Shugar_02_2014.pdf |
_version_ |
1776200997818859520 |