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Crustal structure beneath the inner trench slope of the Japan trench
https://nied-repo.bosai.go.jp/records/4214
https://nied-repo.bosai.go.jp/records/4214eac8f394-66b6-4a4a-8570-74adaf29ecab
| 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 | Crustal structure beneath the inner trench slope of the Japan trench | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 著者 |
K. Suyehiro
× K. Suyehiro
× T. Kanazawa
× A. Nishizawa
× H. Shimamura
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| 抄録 | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | A seismic refraction profiling experiment, using an airgun and dynamite as sources and ocean-bottom seismometers (OBSs) as receivers to delineate the structure down to the uppermost mantle, was carried out at the lower inner trench slope of the Japan Trench region in 1982. The results from airgun profiles are presented in this paper. Two airgun profiles were shot along the 4500 m isobath over five OBSs spaced at intervals of about 50 km and three 60 km long profiles were shot perpendicular to the trench axis across three OBSs. The sedimentary layer is 5-6 km thick with P wave speeds 2-3 km/s. Beneath the sedimentary layer lies a layer about 5 km thick with a wavespeed of 6.3 km/s. A layer indicative of subducting oceanic Layer 2 could not be substantiated. Moho-reflected phases were recorded which could constrain the Moho depth. Taking into account the wavespeed increase inside the 6.3 km/s layer required from the dynamite data, the Moho depth is about 15 km, which is about 2 km shallower than previously reported. The data obtained from profiles shot in an E-W direction could be explained moderately well by a model characterized by a thick sediment in between the trench axis and the lower inner trench slope, and a gradually subducting oceanic Layer 3. The model was constructed to accord with previous results because of large lateral variability in structure. © 1985. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
en : Tectonophysics 巻 112, 号 1-4, p. 155-191 |
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| 収録物識別子タイプ | ISSN | |||||||||||||
| 収録物識別子 | 0040-1951 | |||||||||||||
| DOI | ||||||||||||||
| 関連識別子 | 10.1016/0040-1951(85)90178-7 | |||||||||||||
