Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes
Typical directional features of intraplate stresses are extracted from focal mechanism solutions of earthquakes in the Antarctic plate. Typical directions of stresses are obtained in the following regions, 1) Bellingshausen Sea, 2) south of Juan-Fernandez microplate, 3) Balleny Island region and 4)...
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National Institute of Polar Research
1999
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fttriple:oai:gotriple.eu:oai:doaj.org/article:015c3c9849cb4e2392bb828fe6a1f4ae 2023-05-15T13:55:01+02:00 Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes Atsuki Kubo 1999-03-01 https://doi.org/10.15094/00009068 https://doaj.org/article/015c3c9849cb4e2392bb828fe6a1f4ae en other eng National Institute of Polar Research doi:10.15094/00009068 0085-7289 2432-079X https://doaj.org/article/015c3c9849cb4e2392bb828fe6a1f4ae undefined Antarctic Record, Vol 43, Iss 1, Pp 45-57 (1999) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1999 fttriple https://doi.org/10.15094/00009068 2023-01-22T17:53:20Z Typical directional features of intraplate stresses are extracted from focal mechanism solutions of earthquakes in the Antarctic plate. Typical directions of stresses are obtained in the following regions, 1) Bellingshausen Sea, 2) south of Juan-Fernandez microplate, 3) Balleny Island region and 4) Kerguelen region. P axes in regions 1) and 2) have been interpreted by ridge push force. However these interpretations are based on one focal mechanism for each event and on crude physical concept of ridge push. It is difficult to explain intraplate stress fields in these regions only by the local ridge push force. The stress direction in region 3) can be interpreted by both deformation near triple junction and deformation due to deglaciation. Earthquakes near region 4) appear to be normal fault event. Because normal fault events appear only in the younger ocean floor, the stress field may be affected by thermal features such as hot spots Quantitative modeling and superposition of various stress factors are required to discriminate among stress origins. It is difficult to discuss stress directions in and around Antarctic continent, because number of the earthquakes is not enough. Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Unknown Antarctic The Antarctic Kerguelen Bellingshausen Sea Fernandez ENVELOPE(-62.233,-62.233,-63.250,-63.250) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Atsuki Kubo Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
topic_facet |
geo envir |
description |
Typical directional features of intraplate stresses are extracted from focal mechanism solutions of earthquakes in the Antarctic plate. Typical directions of stresses are obtained in the following regions, 1) Bellingshausen Sea, 2) south of Juan-Fernandez microplate, 3) Balleny Island region and 4) Kerguelen region. P axes in regions 1) and 2) have been interpreted by ridge push force. However these interpretations are based on one focal mechanism for each event and on crude physical concept of ridge push. It is difficult to explain intraplate stress fields in these regions only by the local ridge push force. The stress direction in region 3) can be interpreted by both deformation near triple junction and deformation due to deglaciation. Earthquakes near region 4) appear to be normal fault event. Because normal fault events appear only in the younger ocean floor, the stress field may be affected by thermal features such as hot spots Quantitative modeling and superposition of various stress factors are required to discriminate among stress origins. It is difficult to discuss stress directions in and around Antarctic continent, because number of the earthquakes is not enough. |
format |
Article in Journal/Newspaper |
author |
Atsuki Kubo |
author_facet |
Atsuki Kubo |
author_sort |
Atsuki Kubo |
title |
Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
title_short |
Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
title_full |
Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
title_fullStr |
Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
title_full_unstemmed |
Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes |
title_sort |
stress fields in the antarctic plate inferred from focal mechanisms of intraplate earthquakes |
publisher |
National Institute of Polar Research |
publishDate |
1999 |
url |
https://doi.org/10.15094/00009068 https://doaj.org/article/015c3c9849cb4e2392bb828fe6a1f4ae |
long_lat |
ENVELOPE(-62.233,-62.233,-63.250,-63.250) |
geographic |
Antarctic The Antarctic Kerguelen Bellingshausen Sea Fernandez |
geographic_facet |
Antarctic The Antarctic Kerguelen Bellingshausen Sea Fernandez |
genre |
Antarc* Antarctic Bellingshausen Sea |
genre_facet |
Antarc* Antarctic Bellingshausen Sea |
op_source |
Antarctic Record, Vol 43, Iss 1, Pp 45-57 (1999) |
op_relation |
doi:10.15094/00009068 0085-7289 2432-079X https://doaj.org/article/015c3c9849cb4e2392bb828fe6a1f4ae |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00009068 |
_version_ |
1766261248858521600 |