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Rifting structure of Central Izu-ogasawara (Bonin) arc crust: Results of seismic crustal imaging
https://nied-repo.bosai.go.jp/records/4105
https://nied-repo.bosai.go.jp/records/41058e2a622f-e519-49b9-8489-aa77fde4bc07
| Item type | researchmap(1) | |||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| タイトル | Rifting structure of Central Izu-ogasawara (Bonin) arc crust: Results of seismic crustal imaging | |||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||
| 著者 |
Narumi Takahashi
× Narumi Takahashi
× Mikiya Yamashita
× Shuichi Kodaira
× Seiichi Miura
× Takeshi Sato
× Tetsuo No
× Kaoru Takizawa
× Yoshiyuki Tatsumi
× Yoshiyuki Kaneda
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| 抄録 | ||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||
| 内容記述 | We obtained seismic velocity structures for two crustal profiles across the central Izu-Ogasawara (Bonin) intra-oceanic arc using a multichannel reflection system and ocean-bottom seismographs. The crust beneath the volcanic front in this region is less than 20 km thick. A middle crustal layer (P-wave velocity Vp ~6 km/s), representing andesitic proto-continental crust, is found beneath the volcanic front, the rear-arc, the fore-arc basin and Ogasawara Ridge. Crust with 15–20 km thick beneath the fore-arc basin may have formed in Paleogene time because it is covered with thick sediments. Crustal thinning by rifting is seen between the volcanic front and the rear-arc, where the crustal thickness is ~15 km, the lower crust has high Vp (> 7.3 km/s) and there are normal faults in the shallow crust. Rifted crust also occupies a broad area in the eastern Shikoku Basin. The central Izu-Ogasawara arc has been affected by four rifting episodes compared to two for the northern Izu-Ogasawara arc. The volume of the entire arc crust in the central region is ~20% greater than in the northern region, even though the crust beneath the volcanic front is the thinnest in the entire Izu-Ogasawara arc, as shown by previous studies. The thinner crust in this region reflects greater extension here relative to the arc to the north. |
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| 言語 | en | |||||||||||||||||||||||
| 書誌情報 |
en : Modern Approaches in Solid Earth Sciences 巻 8, p. 75-95 |
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| 出版者 | ||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| 出版者 | Springer International Publishing | |||||||||||||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||||||||||||
| 収録物識別子 | 1876-1682 | |||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||
| 関連識別子 | 10.1007/978-90-481-8885-7_4 | |||||||||||||||||||||||
