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地震波トモグラフィーから推定した九州地方の島弧マグマ分布とスラブ構造
https://doi.org/10.15083/0000032636
https://doi.org/10.15083/0000032636f3144aaa-68b3-4f13-95f7-be02a9815515
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0761015.pdf (828.0 kB)
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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 | 地震波トモグラフィーから推定した九州地方の島弧マグマ分布とスラブ構造 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Tomography | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Philippine Sea slab | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Magmatism | |||||
| 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 | 10.15083/0000032636 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | Tomographic imaging of arc magma and subducting slab beneath the Kyushu subduction zone | |||||
| 著者 |
浅森, 浩一
× 浅森, 浩一× 趙, 大鵬 |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126470 | |||||
| 姓名 | Asamori, Koichi | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126471 | |||||
| 姓名 | Zhao, Dapeng | |||||
| 著者所属 | ||||||
| 著者所属 | 愛媛大学理工学研究科 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The Kyushu subduction zone in southwest Japan is characterized by active subduction of the young Philippine Sea slab beneath the Eurasian plate. We have determined the detailed three-dimensional P-wave velocity structure of the Kyushu subduction zone to a depth of 120 km. We used 9,041 P and S wave arrival times from 486 shallow and intermediate-depth earthquakes, which occurred in and around Kyushu. The arrival times were recorded by the Japan University Seismic Network, which covers the entire Japan Islands densely and uniformly. Our results show that the subducting Philippine Sea slab is imaged clearly as a high-velocity zone. It has a thickness of about 35 km and a P wave velocity 3-5% faster than the initial 1-D velocity model used in this study. Very slow velocity anomalies (3-5%) exist in the mantle wedge and extend to the forearc region down to the subducting Philippine Sea slab beneath northern Kyushu. These results indicate that regimes of melting and magmatism in a subduction zone with a young slab are different from those with old slabs. Dehydration and melting occur beneath the arc and forearc regions above a young slab, such as in northern Kyushu (age<26 Ma), while they occur beneath the volcanic front and back arc above old slabs, such as Northeast Honshu and South Kyushu. The formation of magmatism and volcanism in Kyushu is considered to be related to the convective circulation process in the mantle wedge and the dehydration of the subducting Philippine Sea slab. Large crustal earthquakes during the period 1886-1996 are found to occur in the vicinity of the low-velocity zones, indicating that volcanoes and magma chambers weaken the brittle seismogenic crust, and cause those weak areas to be subject to tectonic stress and prone to large earthquakes. | |||||
| 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. 155-161, 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 | ||||||
