REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60
Gravity value at Astronomical point, Syowa station, was determined by observations with a WORDEN gravimeter in the third Japanese Antarctic Research Expedition 1958-59, and the following result has been obtained: g_<Syowa Station>=982.540cm/sec^2 Latitude 69°00'4S Longitude 39 35.4E Heigh...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:419b633ae594421c8b3d469d0e5309f9 2023-05-15T13:35:58+02:00 REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 Hiromiti SUZUKI Shin-ichi OHASHI Seiichi KAKINUMA 1961-03-01T00:00:00Z https://doi.org/10.15094/00007099 https://doaj.org/article/419b633ae594421c8b3d469d0e5309f9 EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00007099 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007099 0085-7289 2432-079X https://doaj.org/article/419b633ae594421c8b3d469d0e5309f9 Antarctic Record, Iss 12, Pp 1063-1070 (1961) Geography (General) G1-922 article 1961 ftdoajarticles https://doi.org/10.15094/00007099 2022-12-31T10:30:46Z Gravity value at Astronomical point, Syowa station, was determined by observations with a WORDEN gravimeter in the third Japanese Antarctic Research Expedition 1958-59, and the following result has been obtained: g_<Syowa Station>=982.540cm/sec^2 Latitude 69°00'4S Longitude 39 35.4E Height 29.2m relative to g_<Cape Town>=979.6470cm/sec^2. The accuracy of this value was estimated to be a few milligals by investigating the drift of the gravimeter during the period of the expedition and considering the uncertainty in the scale value of the gravimeter. This estimation was, however, based on several assumptions and the result may include a serious error. Fortunately, Syowa Station has been built on the ground and not on ice, therefore, we can reoccupy the very point of the station with our gravimeter and confirm the observed result. In the fourth expedition 1959-60, a re-measurement of the gravity value at Syowa Station was planned and carried out by using the same gravimeter in the way similar to the preceding expedition. It was confirmed that the gravimeter had a small and linear drift during the whole period of the expedition by continuous observations in Tokyo, Singapore, Cape Town as well as at Syowa Station. The drift rate for the period of 77 days during the forward and backward voyage between Cape Town and Antarctica was deduced to be +0.24 milligal per day. This value agreed well with a value, +0.25 milligal per day, which was deduced for the period of stay at Syowa Station. We have obtained a mean value of gravity, 982.5427, from observations at the station in this expedition. This is 2.6 milligal higher than the former mean value. Errors due to the drift and the changing in the scale value might have caused this difference. It is considered, however, that this is accurate enough to be used safely as a reference value in gravity measurement in this district. Therefore, we have concluded that the former value has an expected, accuracy and it is unnecessary to correct it by present result. On the ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Syowa Station |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Hiromiti SUZUKI Shin-ichi OHASHI Seiichi KAKINUMA REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
topic_facet |
Geography (General) G1-922 |
description |
Gravity value at Astronomical point, Syowa station, was determined by observations with a WORDEN gravimeter in the third Japanese Antarctic Research Expedition 1958-59, and the following result has been obtained: g_<Syowa Station>=982.540cm/sec^2 Latitude 69°00'4S Longitude 39 35.4E Height 29.2m relative to g_<Cape Town>=979.6470cm/sec^2. The accuracy of this value was estimated to be a few milligals by investigating the drift of the gravimeter during the period of the expedition and considering the uncertainty in the scale value of the gravimeter. This estimation was, however, based on several assumptions and the result may include a serious error. Fortunately, Syowa Station has been built on the ground and not on ice, therefore, we can reoccupy the very point of the station with our gravimeter and confirm the observed result. In the fourth expedition 1959-60, a re-measurement of the gravity value at Syowa Station was planned and carried out by using the same gravimeter in the way similar to the preceding expedition. It was confirmed that the gravimeter had a small and linear drift during the whole period of the expedition by continuous observations in Tokyo, Singapore, Cape Town as well as at Syowa Station. The drift rate for the period of 77 days during the forward and backward voyage between Cape Town and Antarctica was deduced to be +0.24 milligal per day. This value agreed well with a value, +0.25 milligal per day, which was deduced for the period of stay at Syowa Station. We have obtained a mean value of gravity, 982.5427, from observations at the station in this expedition. This is 2.6 milligal higher than the former mean value. Errors due to the drift and the changing in the scale value might have caused this difference. It is considered, however, that this is accurate enough to be used safely as a reference value in gravity measurement in this district. Therefore, we have concluded that the former value has an expected, accuracy and it is unnecessary to correct it by present result. On the ... |
format |
Article in Journal/Newspaper |
author |
Hiromiti SUZUKI Shin-ichi OHASHI Seiichi KAKINUMA |
author_facet |
Hiromiti SUZUKI Shin-ichi OHASHI Seiichi KAKINUMA |
author_sort |
Hiromiti SUZUKI |
title |
REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
title_short |
REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
title_full |
REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
title_fullStr |
REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
title_full_unstemmed |
REPORT OF THE GRAVITY MEASUREMENT BY THE JAPANESE ANTARCTIC RESEARCH EXPEDITION, 1959-60 |
title_sort |
report of the gravity measurement by the japanese antarctic research expedition, 1959-60 |
publisher |
National Institute of Polar Research |
publishDate |
1961 |
url |
https://doi.org/10.15094/00007099 https://doaj.org/article/419b633ae594421c8b3d469d0e5309f9 |
geographic |
Antarctic Syowa Station |
geographic_facet |
Antarctic Syowa Station |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Antarctic Record, Iss 12, Pp 1063-1070 (1961) |
op_relation |
https://doi.org/10.15094/00007099 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007099 0085-7289 2432-079X https://doaj.org/article/419b633ae594421c8b3d469d0e5309f9 |
op_doi |
https://doi.org/10.15094/00007099 |
_version_ |
1766072589499760640 |