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2009年海中爆破実験による伊豆大島及びその周辺の地震波速度構造
https://doi.org/10.15083/0002002957
https://doi.org/10.15083/0002002957c9b658ae-ce27-408e-be0c-c9bbc8220efb
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
IHO961202.pdf (9.9 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||
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| 公開日 | 2021-12-21 | |||||||||||||
| タイトル | ||||||||||||||
| タイトル | 2009年海中爆破実験による伊豆大島及びその周辺の地震波速度構造 | |||||||||||||
| 言語 | ja | |||||||||||||
| タイトル | ||||||||||||||
| タイトル | Velocity Structure at Izu-Oshima Volcano and its Surrounding Region Inferred from 2009 Seismic Explorations Using Sea-shots | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | jpn | |||||||||||||
| キーワード | ||||||||||||||
| 言語 | en | |||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | Izu-Oshima volcano | |||||||||||||
| キーワード | ||||||||||||||
| 言語 | en | |||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | seismic structure | |||||||||||||
| キーワード | ||||||||||||||
| 言語 | en | |||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | seismic exploration | |||||||||||||
| キーワード | ||||||||||||||
| 言語 | en | |||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | seismicity and structure | |||||||||||||
| キーワード | ||||||||||||||
| 言語 | en | |||||||||||||
| 主題Scheme | Other | |||||||||||||
| 主題 | magma plumbing system | |||||||||||||
| 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 | 10.15083/0002002957 | |||||||||||||
| ID登録タイプ | JaLC | |||||||||||||
| 著者 |
森田, 裕一
× 森田, 裕一
× 2009年伊豆大島構造探査実験グループ
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| 著者所属 | ||||||||||||||
| 言語 | ja | |||||||||||||
| 著者所属 | 東京大学地震研究所 | |||||||||||||
| 著者所属 | ||||||||||||||
| 言語 | ja | |||||||||||||
| 著者所属 | 国立研究開発法人防災科学技術研究所 | |||||||||||||
| 著者所属 | ||||||||||||||
| 言語 | en | |||||||||||||
| 著者所属 | Earthquake Research Institute, The University of Tokyo | |||||||||||||
| 著者所属 | ||||||||||||||
| 言語 | en | |||||||||||||
| 著者所属 | National Research Institute for Earth Science and Disaster Resilience | |||||||||||||
| 抄録 | ||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||
| 内容記述 | Seismic exploration was conducted to reveal the velocity structure beneath Izu-Oshima volcano in 2009. This paper documented an overview of the exploration, detailed data processing and estimated velocity structure, as well as the contents of the acquired data archive, which will be freely opened to the research community. Thirty-eight ocean bottom seismometers (OBS) were deployed along a survey line extending WSW to ENE with an interval of around two kilometers, and around 300 seismometers were installed on land with an interval of 50 to 100m. The entire survey line passed through Izu-Oshima island, including the central summit of the volcano, and reached approximately 70km in length. The controlled sources were dynamite explosions, each with a charge of 300 kg, located at nine points along the OBS survey line, and a pressure source (air-gun: with a capacity 50l) deployed along the OBS survey line and around off the coast of Izu-Oshima island. The upper and middle crust velocity structure beneath Izu-Oshima volcano and its surrounding region are estimated to a depth of around 10km using the 2D ray tracing method. As with other volcanoes, a convex basement structure is found at a depth of seven kilometers beneath the volcanic edifice. An interesting relation is found among estimated velocity structure and volcanic seismicity as well as ground deformation sources. Ground inflation and deflation sources and hypocenters of volcano-tectonic earthquakes with burst-type activity are limited in the upper middle crust with a P wave velocity of 5.5-6.0 km/s. On the other hand, persistently activated earthquakes just beneath the summit caldera are located in the upper crust, whose velocity is very low. This suggests that the magma storage and plumbing system of the volcano is defined strongly by a layered structure. Revealing the structure beneath volcanoes is essential for understanding their activities. |
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| 言語 | en | |||||||||||||
| 書誌情報 |
ja : 東京大学地震研究所彙報 en : Bulletin of the Earthquake Research Institute, University of Tokyo 巻 96, 号 1-2, p. 11-27, 発行日 2021-12-07 |
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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 | |||||||||||||
| 出版者 | ||||||||||||||
| 出版者 | 東京大学地震研究所 | |||||||||||||
| 言語 | ja | |||||||||||||
| 出版者 | ||||||||||||||
| 出版者 | Earthquake Research Institute, The University of Tokyo | |||||||||||||
| 言語 | en | |||||||||||||
