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S波スピリッティングから見た下北半島下のリソスフェアの不均質構造
https://doi.org/10.15083/0000032625
https://doi.org/10.15083/000003262577db8e56-9cd0-4db0-b1b9-1928ea05ead4
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0761004.pdf (1.7 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-05-30 | |||||
| タイトル | ||||||
| タイトル | S波スピリッティングから見た下北半島下のリソスフェアの不均質構造 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | shear-wave splitting | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | anisotropy | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | mantle wedge | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | magnetic anomaly | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000032625 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | Heterogeneities in the lithosphere beneath Shimokita Peninsula, northeast Japan, as inferred from shear-wave splitting measurements | |||||
| 著者 |
小菅, 正裕
× 小菅, 正裕× 置田, 貴代美 |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126337 | |||||
| 姓名 | Kosuga, Masahiro | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126338 | |||||
| 姓名 | Okita, Kiyomi | |||||
| 著者所属 | ||||||
| 著者所属 | 弘前大学理工学部 | |||||
| 著者所属 | ||||||
| 著者所属 | 株式会社恵和ビジネス | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We measured shear-wave splitting parameters from local earthquakes at three stations in the Shimokita Peninsula, northeast Japan, and found the station-dependent feature of splitting. Polarization of fast S-waves at station OGM in the central part of the Peninsula is restricted to NNW-SSE, irrespective of source location. Because the polarization direction is consistent with the trend of P-axes of shallow earthquakes that occurred near the station, we interpret the origin of anisotropy as the preferred orientation of cracks aligned parallel to the direction of the maximum compressional stress in the crust. Conversely, the splitting observed at stations KMN and STK is characterized by N-S polarization for eastern ray paths and E-W polarization for western ray paths, which suggests the existence of two anisotropic bodies in the mantle wedge. The boundary of anisotropic bodies parallels the strong, positive magnetic anomaly that runs N-S from Hokkaido to the east coast of central Iwate prefecture. The N-S polarized rays pass through a region beneath the Kitakami pluton that causes the magnetic anomaly. The origin of N-S polarized anisotropy is possibly the alignment of solidified melt that had formed during the intrusion of magma in the Cretaceous age, and/or the mineral re-orientation enhanced by the magmatism. | |||||
| 書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 76, 号 1, p. 37-49, 発行日 2001-07-25 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00162258 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | 東京大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, University of Tokyo | ||||||
