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地震のメカニズムからみた南極プレート内の応力場
https://doi.org/10.15094/00009068
https://doi.org/10.15094/000090685e370314-9f44-418e-a2d8-63b20705c437
名前 / ファイル | ライセンス | アクション |
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KJ00000140446 (505.0 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1999-03-01 | |||||
タイトル | ||||||
タイトル | 地震のメカニズムからみた南極プレート内の応力場 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Stress fields in the Antarctic plate inferred from focal mechanisms of intraplate earthquakes | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00009068 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
論文名よみ | ||||||
その他のタイトル | ジシン ノ メカニズム カラ ミタ ナンキョク プレート ナイ ノ オウリョクバ | |||||
著者名(日) |
久保, 篤規
× 久保, 篤規 |
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著者名(英) |
Kubo, Atsuki
× Kubo, Atsuki |
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著者所属(日) | ||||||
東京大学地震研究所 | ||||||
著者所属(英) | ||||||
en | ||||||
Earthquake Research Institute, The University of Tokyo | ||||||
抄録(日) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 地震のメカニズム解を用いて南極プレート内の特徴的な応力場を抽出した。その結果, 1) Bellingshausen海, 2) Juan-Fernandezマイクロプレート南方沖, 3) Balleny島近傍, 4) Kerguelen島地域, で特徴的な結果が得られた。近傍のリッジ押しのみによって4地域の観測事実を説明するのは困難である。このうち1), 2) での応力場はこれまでリッジ押しで説明されてきたが, データ量の増加とリッジ押しのイメージが明確になったことから, 少なくとも近傍のリッジ押しのみでは応力場は説明できない。3) での地震の起震応力場は, トリプルジャンクション近傍の変形や後氷期地殻変動が震央域を押してやることによって説明可能である。4) では正断層の地震が起こり, ホットスポットなどによる熱応力が重要になる。応力源の特定には定量的モデル化が必要である。大陸内, 大陸縁における応力場は地震が少なく明確な議論は現状では困難である。 | |||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 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. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00181831 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00857289 | |||||
書誌情報 |
南極資料 en : Antarctic Record 巻 43, 号 1, p. 45-57, 発行日 1999-03 |
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国際十進分類法 | ||||||
主題Scheme | UDC | |||||
主題 | 550.34:551.2 |