Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica
A re-compilation of gravity data around Syowa Station, East Antarctica (68°-78°S, 25°-55°E) was made, to present three-dimensional contour maps of gravity anomalies. Ice sheet and bedrock topography contour maps were also obtained. Gravity values calculated by Potsdam System are unified to IGSN71 Sy...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:36d61c068bfb4634a0d9bf65a95a0828 2023-05-15T13:49:30+02:00 Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica Toshiyasu Nagao Masaru Awara Katsutada Kaminuma 1991-03-01T00:00:00Z https://doi.org/10.15094/00008712 https://doaj.org/article/36d61c068bfb4634a0d9bf65a95a0828 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008712 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008712 0085-7289 2432-079X https://doaj.org/article/36d61c068bfb4634a0d9bf65a95a0828 Antarctic Record, Vol 35, Iss 1, Pp 56-69 (1991) Geography (General) G1-922 article 1991 ftdoajarticles https://doi.org/10.15094/00008712 2022-12-30T21:05:42Z A re-compilation of gravity data around Syowa Station, East Antarctica (68°-78°S, 25°-55°E) was made, to present three-dimensional contour maps of gravity anomalies. Ice sheet and bedrock topography contour maps were also obtained. Gravity values calculated by Potsdam System are unified to IGSN71 System, and accuracy of gravity values was evaluated. In Mizuho Plateau, some gravity anomalies had been calculated by the geoid height, and others by the height from WGS-72 ellipsoids. Therefore, to remove this confusion, we recalculated all of gravity anomalies using the geoid height. The results are as follows : 1) An accuracy of gravity value determination is less than 3 mgal. 2) An accuracy of free air anomaly is about 10mgal. 3) The result of bedrock elevation determination observed with radio echo sounding and that estimated from gravity data show a rather good coincidence in general. However, a detailed comparison reveals many local discrepancies between the two results. Accurate determination of bedrock topography is one of the most significant items for understanding the region. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Directory of Open Access Journals: DOAJ Articles East Antarctica Syowa Station Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) Mizuho Plateau ENVELOPE(40.000,40.000,-73.000,-73.000) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Toshiyasu Nagao Masaru Awara Katsutada Kaminuma Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
A re-compilation of gravity data around Syowa Station, East Antarctica (68°-78°S, 25°-55°E) was made, to present three-dimensional contour maps of gravity anomalies. Ice sheet and bedrock topography contour maps were also obtained. Gravity values calculated by Potsdam System are unified to IGSN71 System, and accuracy of gravity values was evaluated. In Mizuho Plateau, some gravity anomalies had been calculated by the geoid height, and others by the height from WGS-72 ellipsoids. Therefore, to remove this confusion, we recalculated all of gravity anomalies using the geoid height. The results are as follows : 1) An accuracy of gravity value determination is less than 3 mgal. 2) An accuracy of free air anomaly is about 10mgal. 3) The result of bedrock elevation determination observed with radio echo sounding and that estimated from gravity data show a rather good coincidence in general. However, a detailed comparison reveals many local discrepancies between the two results. Accurate determination of bedrock topography is one of the most significant items for understanding the region. |
format |
Article in Journal/Newspaper |
author |
Toshiyasu Nagao Masaru Awara Katsutada Kaminuma |
author_facet |
Toshiyasu Nagao Masaru Awara Katsutada Kaminuma |
author_sort |
Toshiyasu Nagao |
title |
Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
title_short |
Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
title_full |
Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
title_fullStr |
Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
title_full_unstemmed |
Three-dimensional topographic and gravity anomaly maps in the vicinity of Mizuho Plateau, East Antarctica |
title_sort |
three-dimensional topographic and gravity anomaly maps in the vicinity of mizuho plateau, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1991 |
url |
https://doi.org/10.15094/00008712 https://doaj.org/article/36d61c068bfb4634a0d9bf65a95a0828 |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) ENVELOPE(40.000,40.000,-73.000,-73.000) |
geographic |
East Antarctica Syowa Station Mizuho Mizuho Plateau |
geographic_facet |
East Antarctica Syowa Station Mizuho Mizuho Plateau |
genre |
Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet |
op_source |
Antarctic Record, Vol 35, Iss 1, Pp 56-69 (1991) |
op_relation |
http://doi.org/10.15094/00008712 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008712 0085-7289 2432-079X https://doaj.org/article/36d61c068bfb4634a0d9bf65a95a0828 |
op_doi |
https://doi.org/10.15094/00008712 |
_version_ |
1766251447468425216 |