昭和基地で観測した微小地震
Small shocks like micro-earthquakes are recorded frequently at Syowa Station. The small shocks are roughly classified into two types according to the initial motion. One has a sharp initial motion (type I) and the other has a weak one (type II). Some shocks of type I have a clear S phase and the res...
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東京大学地震研究所
1971
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ftnipr:oai:nipr.repo.nii.ac.jp:00007617 2023-07-02T03:30:07+02:00 昭和基地で観測した微小地震 ショウワキチ デ カンソク シタ ビショウ ジシン 神沼 克伊 Katsutada KAMINUMA 1971-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7617 http://id.nii.ac.jp/1291/00007617/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7617&item_no=1&attribute_id=18&file_no=1 ja jpn 東京大学地震研究所 Earthquake Research Institute, University of Tokyo 国立極地研究所 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7617 http://id.nii.ac.jp/1291/00007617/ AN00181831 00857289 南極資料, 40, 65-73(1971-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7617&item_no=1&attribute_id=18&file_no=1 550.34:551.2 Departmental Bulletin Paper P(論文) 1971 ftnipr 2023-06-10T19:38:20Z Small shocks like micro-earthquakes are recorded frequently at Syowa Station. The small shocks are roughly classified into two types according to the initial motion. One has a sharp initial motion (type I) and the other has a weak one (type II). Some shocks of type I have a clear S phase and the rest have a small S phase. A swarm of type II shocks is recorded once or twice a year. The swarm occurs only in the summer season. With the data of February to December of 1969, ISHIMOTO-IIDA constant of the shocks of type II was calculated as m=1.99 using UTSU'S formula. It is established by MOGI that "m" increases with the degree of heterogeneity of the medium and also with the degree of spatial variation in the stress distribution of the field. The movement of the continental ice is active in the summer season and the structure may become heterogeneous. Thus, it is concluded that the shocks of type II are iceshocks (or icequakes). On the other hand, if a natural earthquake occurs around Syowa Station, its "m" is estimated at about 1.4, because the area belongs to the geological province of Pre-Cambrian gneiss, a part of the east Antarctic shield which is one of the non-seismic regions on the earth. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Antarctic Syowa Station |
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National Institute of Polar Research Repository, Japan |
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Japanese |
topic |
550.34:551.2 |
spellingShingle |
550.34:551.2 神沼 克伊 Katsutada KAMINUMA 昭和基地で観測した微小地震 |
topic_facet |
550.34:551.2 |
description |
Small shocks like micro-earthquakes are recorded frequently at Syowa Station. The small shocks are roughly classified into two types according to the initial motion. One has a sharp initial motion (type I) and the other has a weak one (type II). Some shocks of type I have a clear S phase and the rest have a small S phase. A swarm of type II shocks is recorded once or twice a year. The swarm occurs only in the summer season. With the data of February to December of 1969, ISHIMOTO-IIDA constant of the shocks of type II was calculated as m=1.99 using UTSU'S formula. It is established by MOGI that "m" increases with the degree of heterogeneity of the medium and also with the degree of spatial variation in the stress distribution of the field. The movement of the continental ice is active in the summer season and the structure may become heterogeneous. Thus, it is concluded that the shocks of type II are iceshocks (or icequakes). On the other hand, if a natural earthquake occurs around Syowa Station, its "m" is estimated at about 1.4, because the area belongs to the geological province of Pre-Cambrian gneiss, a part of the east Antarctic shield which is one of the non-seismic regions on the earth. |
format |
Report |
author |
神沼 克伊 Katsutada KAMINUMA |
author_facet |
神沼 克伊 Katsutada KAMINUMA |
author_sort |
神沼 克伊 |
title |
昭和基地で観測した微小地震 |
title_short |
昭和基地で観測した微小地震 |
title_full |
昭和基地で観測した微小地震 |
title_fullStr |
昭和基地で観測した微小地震 |
title_full_unstemmed |
昭和基地で観測した微小地震 |
title_sort |
昭和基地で観測した微小地震 |
publisher |
東京大学地震研究所 |
publishDate |
1971 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7617 http://id.nii.ac.jp/1291/00007617/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7617&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic Syowa Station |
geographic_facet |
Antarctic Syowa Station |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7617 http://id.nii.ac.jp/1291/00007617/ AN00181831 00857289 南極資料, 40, 65-73(1971-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7617&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1770274352564011008 |