ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY
Structual analyses of the core revealed that the ice fabric pattern as well as the shape of individual ice grains and air bubbles exhibited strong anisotropies. They were correlated with the stress conditions of the ice sheet around the station. This became possible by an estimation of the geographi...
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Department of Applied Physics, Faculty of Engineering, Hokkaido University
1987
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ftnipr:oai:nipr.repo.nii.ac.jp:00003530 2023-05-15T16:41:00+02:00 ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY フジタ シュウジ ナカワ マサヨシ マエ シンジ Shuji FUJITA Masayoshi NAKAWO Shinji MAE 1987-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3530 http://id.nii.ac.jp/1291/00003530/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3530&item_no=1&attribute_id=18&file_no=1 en eng Department of Applied Physics, Faculty of Engineering, Hokkaido University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3530 http://id.nii.ac.jp/1291/00003530/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 1, 122-131(1987-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3530&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1987 ftnipr 2022-12-10T19:45:40Z Structual analyses of the core revealed that the ice fabric pattern as well as the shape of individual ice grains and air bubbles exhibited strong anisotropies. They were correlated with the stress conditions of the ice sheet around the station. This became possible by an estimation of the geographical orientation of the core through measurements of the natural remanent magnetization formed accidentally. It was found that ice grains and air bubbles were elongated in the direction of flow, which was identical with the direction of the tensile strain. Also, c-axes of the ice grains tended to orient perpendicular to the tensile axis, forming a vertical great girdle pattern, which is considered to have resulted from by the gradual rotation of the ice grains toward a plane normal to the tensile axis. The rotation of the grains was calculated with respect to the total strain, simulating a formation of the great girdle fabric pattern. By comparing the simulated fabric pattern with the measured pattern of the Mizuho core, the accumulated strain in the core ice was estimated at various depths. The total strain the core ice has experienced increased almost linearly with depth at a rate of about 20% per 100m. Report Ice Sheet Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology National Institute of Polar Research Repository, Japan Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Structual analyses of the core revealed that the ice fabric pattern as well as the shape of individual ice grains and air bubbles exhibited strong anisotropies. They were correlated with the stress conditions of the ice sheet around the station. This became possible by an estimation of the geographical orientation of the core through measurements of the natural remanent magnetization formed accidentally. It was found that ice grains and air bubbles were elongated in the direction of flow, which was identical with the direction of the tensile strain. Also, c-axes of the ice grains tended to orient perpendicular to the tensile axis, forming a vertical great girdle pattern, which is considered to have resulted from by the gradual rotation of the ice grains toward a plane normal to the tensile axis. The rotation of the grains was calculated with respect to the total strain, simulating a formation of the great girdle fabric pattern. By comparing the simulated fabric pattern with the measured pattern of the Mizuho core, the accumulated strain in the core ice was estimated at various depths. The total strain the core ice has experienced increased almost linearly with depth at a rate of about 20% per 100m. |
format |
Report |
author |
フジタ シュウジ ナカワ マサヨシ マエ シンジ Shuji FUJITA Masayoshi NAKAWO Shinji MAE |
spellingShingle |
フジタ シュウジ ナカワ マサヨシ マエ シンジ Shuji FUJITA Masayoshi NAKAWO Shinji MAE ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
author_facet |
フジタ シュウジ ナカワ マサヨシ マエ シンジ Shuji FUJITA Masayoshi NAKAWO Shinji MAE |
author_sort |
フジタ シュウジ |
title |
ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
title_short |
ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
title_full |
ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
title_fullStr |
ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
title_full_unstemmed |
ORIENTATION OF THE 700-M MIZUHO CORE AND ITS STRAIN HISTORY |
title_sort |
orientation of the 700-m mizuho core and its strain history |
publisher |
Department of Applied Physics, Faculty of Engineering, Hokkaido University |
publishDate |
1987 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3530 http://id.nii.ac.jp/1291/00003530/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3530&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) |
geographic |
Mizuho |
geographic_facet |
Mizuho |
genre |
Ice Sheet Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology |
genre_facet |
Ice Sheet Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3530 http://id.nii.ac.jp/1291/00003530/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 1, 122-131(1987-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3530&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766031433311191040 |