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  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 77
  4. 3
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 77
  5. 3

伊豆弧衝突に伴う西南日本弧の地殻構造改変

https://doi.org/10.15083/0000032580
ae9b189e-3d05-403b-b0cd-5b9434e12011
名前 / ファイル ライセンス アクション
ji0773003.pdf ji0773003.pdf (3.1 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-30
タイトル
タイトル 伊豆弧衝突に伴う西南日本弧の地殻構造改変
言語 ja
言語
言語 jpn
キーワード
主題 Izu-Bonin Arc
主題Scheme Other
キーワード
主題 Southwest Japan Arc
主題Scheme Other
キーワード
主題 arc-arc collision
主題Scheme Other
キーワード
主題 bending
主題Scheme Other
キーワード
主題 vertical-axis rotation
主題Scheme Other
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 10.15083/0000032580
ID登録タイプ JaLC
その他のタイトル
その他のタイトル Re-arrangement of the Shallow-level structure of Southwest Japan Arc due to the collision of the Izu-Bonin Arc
著者 狩野, 謙一

× 狩野, 謙一

WEKO 125916

狩野, 謙一

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著者別名
識別子
識別子 125917
識別子Scheme WEKO
姓名
姓名 Kano, Ken-ichi
著者所属
著者所属 静岡大学理学部地球科学教室
抄録
内容記述タイプ Abstract
内容記述 The central part of the Honshu Arc collided in the South Fossa Magna (SFM) area with the crossing Izu-Bonin Arc (IBA), forming a cuspidate bend of the pre-Middle Miocene basement rocks of the Honshu Arc. This paper summarizes the effects of the collision on the basement rocks of the Southwest Japan Arc (SWJA), the southwestern segment of the Honshu Arc. The northward shift of the pre-Middle Miocene rocks in the Akaishi Mountains in the easternmost SWJA on the frontal side of the SFM collision zone reaches more than 160 km at a sub-vertical-axis, under counterclockwise rotation with N-S trending, left-lateral strike-slip faultings. The Mesozoic rocks of the Mino and Ryoke Belts to the north of the Akaishi Mountains at the rear side of the collision zone also shifted about 80 km northward about a sub-vertical rotation axis. These northward shifts also had some components of horizontal-axis rotation and resulted in the re-arrangement of geologic bodies in the shallow-crustal level of eastern SWJA. Chronological and paleomagnetic data clearly suggest that the northward bend occurred in a short period of the Middle Miocene around 15 Ma. This intra-arc bending originated from the combined effects of the clockwise rotation of SWJA in association with the rapid fan-shaped opening of the Sea of Japan, and the initial collision of SWJA with the northern tip of IBA, the Kushigatayama Block. The E-W compression due to the intra-arc bending of the eastern SWJA resulted in the formation of N-S trending, km-scale folds with the vertical axes at the inner side of the hinge area of this bending about 150-200 km west of the collision zone. These wide effects on the eastern SWJA probably occurred under a high geothermal regime that weakened its upper crust. Compared to the initial collision, the following Late Miocene and Pliocene collisions due to the north or northwestward advance of IBA did not severely affect the pre-existing structures in SWJA. The latest collision with the Izu Block since 1 Ma has caused a rapid uplift of left-stepping, en-echelon arranging mountain ranges on the eastern SWJA.
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 77, 号 3, p. 231-248, 発行日 2003-01-31
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 453
主題Scheme NDC
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
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