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Report on DELP 1988 Cruises in the Okinawa Trough : Part 3. Crustal structure of the southern Okinawa Trough
https://doi.org/10.15083/0000032755
https://doi.org/10.15083/0000032755cb63768c-00fd-47b6-9a97-bcea59893710
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0661003.pdf (6.9 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2009-10-13 | |||||
| タイトル | ||||||
| タイトル | Report on DELP 1988 Cruises in the Okinawa Trough : Part 3. Crustal structure of the southern Okinawa Trough | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 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 | 10.15083/0000032755 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | DELP 1988年度沖繩トラフ海域研究航海報告 : 3. 南部沖縄トラフの地殻構造 | |||||
| 著者 |
Hirata, Naoshi
× Hirata, Naoshi× Kinoshita, Hajimu× Katao, Hiroshi× Baba, Hisatoshi× Kaiho, Yuka× Koresawa, Sadayuki× Ono, Yuichiro× Hayashi, Kohichi |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127317 | |||||
| 姓名 | 平田, 直 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127318 | |||||
| 姓名 | 木下, 肇 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127319 | |||||
| 姓名 | 小野, 裕一朗 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127320 | |||||
| 姓名 | 林, 宏一 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127321 | |||||
| 姓名 | 片尾, 浩 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127322 | |||||
| 姓名 | 是沢, 定之 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127323 | |||||
| 姓名 | 馬場, 久紀 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 127324 | |||||
| 姓名 | 海宝, 由佳 | |||||
| 著者所属 | ||||||
| 著者所属 | Department of Earth Sciences, Chiba University | |||||
| 著者所属 | ||||||
| 著者所属 | Earthquake Research Institute, The University of Tokyo | |||||
| 著者所属 | ||||||
| 著者所属 | Department of Marine Mineral Resources, Tokai University | |||||
| 著者所属 | ||||||
| 著者所属 | Geophysical Institute, The University of Tokyo | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A refraction seismic experiment was conducted in the southern Okinawa Trough to study the crustal structure of a back-arc basin. We deployed 18 ocean bottom seismometers (OBSs) every 11km along a 195-km profile. We shot three large explosives (600kg, 500kg, and 450 kg) and 50 small explosives (50 kg and 25 kg). The explosions were complemented by shots from an array of a 9-liter airgun and a 16-liter airgun. The average shot interval of the explosives was 3.8 km, and that of the airguns was 150m. The analysis of the refraction data, using the τ-p method and two-dimensional ray tracing forward modeling of the seismic wave field, showed no evidence of a young oceanic crust even beneath the central axis of the southern Okinawa Trough. A 2-3-km thick sediment was underlain by a layer with a P-wave velocity around 6 km/s. The Moho depth was more than 18 km below the sea surface according to the phase which was propagated in the lower crustal structure, although no clear first arrival of the refraction phase of the uppermost mantle was observed. The distribution of the P-wave velocity and the thickness of the crust indicated that the crust of the southern Okinawa Trough is more similar to that of a continent than to that of an ocean. Our data support the idea that the southern Okinawa Trough is in the stage of incipient rifting of the back-arc basin accompanied by a slight thinning of the continental crust. | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 1988年7月に南部沖縄トラフで, 18台の海底地震計を用いた屈折法地震探査が行われた.南北195kmの測線上で3発の大発破(600, 500, 450kg)と50発の小発破(50, 25kg)を行った.更に,上部地殻を精密に調べるために, 91と161のエアガンアレイを50～70秒間隔で発振して,高密度の屈折地震波記録を得た.海底地震計の間隔は平均11km,平均火薬発破間隔は3.8km,平均エアガン発振間隔は150mであった. | |||||
| 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 66, 号 1, p. 37-70, 発行日 1991-06-28 |
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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 | ||||||
