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  1. 防災科研関係論文

Seismic structure of the extended continental crust in the Yamato Basin, Japan Sea, from ocean bottom seismometer survey

https://nied-repo.bosai.go.jp/records/2799
https://nied-repo.bosai.go.jp/records/2799
8f8c0801-88e5-4dc8-a6da-d2756b310dc1
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Seismic structure of the extended continental crust in the Yamato Basin, Japan Sea, from ocean bottom seismometer survey
タイトル
言語 en
タイトル Seismic structure of the extended continental crust in the Yamato Basin, Japan Sea, from ocean bottom seismometer survey
言語
言語 eng
著者 Kazuo Nakahigashi

× Kazuo Nakahigashi

ja Kazuo Nakahigashi

en Kazuo Nakahigashi

Search repository
Masanao Shinohara

× Masanao Shinohara

ja Masanao Shinohara

en Masanao Shinohara

Search repository
Tomoaki Yamada

× Tomoaki Yamada

ja Tomoaki Yamada

en Tomoaki Yamada

Search repository
Kenji Uehira

× Kenji Uehira

ja Kenji Uehira

en Kenji Uehira

Search repository
Kimihiro Mochizuki

× Kimihiro Mochizuki

ja Kimihiro Mochizuki

en Kimihiro Mochizuki

Search repository
Toshihiko Kanazawa

× Toshihiko Kanazawa

ja Toshihiko Kanazawa

en Toshihiko Kanazawa

Search repository
抄録
内容記述タイプ Other
内容記述 We present the result of a seismic experiment conducted using ocean bottom seismometers and an airgun in the Yamato Basin, of the Japan Sea. The Japan Sea is one of the most well-studied back-arc basins in the western Pacific. The Japan Sea is believed to have been formed by back-arc opening. However, the timing and formation processes of the opening of individual basins in and around the Japan Sea are not clear. To reveal the crustal structure of the Yamato Basin it is important to consider the formation process of the Japan Sea. Therefore, we conducted a seismic survey and estimated the P-wave seismic velocity structure beneath the 170-km profile using a 2-D ray-tracing method. A layer with a P-wave velocity of 3.4-4.0. km/s underlies the sedimentary sections, which is thought to consist of a sill-and-sediment complex. The upper crust below the profile varies greatly in thickness. The thickness of the upper crust is 3.5. km in the thinnest part and 7. km in the thickest part. The thickness of the lower crust is approximately 8. km and is relatively constant over the profile. The total thickness of the crust is approximately 15. km including the sedimentary layer. The distribution of P-wave velocities and the thickness indicate that the crust in the Yamato Basin is neither a typical continental nor a typical oceanic crust. From the point of view of seismic velocity, the obtained structure is more similar to a continental crust than to an oceanic crust. The large lateral thickness variation in the upper crust and the uniform thickness of the lower crust suggest that the crust in the study area was formed by rifting/extension of continental crust during the opening of the Japan Sea. The margins of the continent or of island arcs can be divided into two types: volcanic rifted margins and non-volcanic rifted margins. Volcanic rifted margins are normally classified by the presence of a high-velocity body in the lower crust. At the volcanic rifted margin, the high-velocity body is formed in the lower crust. We did not observe such a high-velocity layer at depth on our profile. In contrast, the acoustic basement consists of a sill-and-sediment complex. Therefore, we infer that the study area was affected by volcanism during its formation. However, the magmatism was not significantly massive. c 2013 Elsevier Ltd.
言語 en
書誌情報 ja : Journal of Asian Earth Sciences
en : Journal of Asian Earth Sciences

巻 67-68, p. 199-206, 発行日 2013-05
出版者
言語 en
出版者 Elsevier BV
ISSN
収録物識別子タイプ ISSN
収録物識別子 1367-9120
DOI
関連識別子 10.1016/j.jseaes.2013.02.028
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