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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 1930 North Izu earthquake ： ウィキペディア英語版 1930 North Izu earthquake The 1930 North Izu earthquake (1930年北伊豆地震, ''Sen-kyūhyaku-sanjū-nen Kita-Izu Jishin'') occurred on .〔National Geophysical Data Center / World Data Center (NGDC/WDC) Significant Earthquake Database, Boulder, CO, USA. (Available at http://www.ngdc.noaa.gov/nndc/struts/form?t=101650&s=1&d=1)〕 The epicenter was located in the northern Izu Peninsula, Japan. It had a magnitude of Ms 7.3. The earthquake was caused by the movement of the Tanna Fault (丹那断層). == Geology == The Izu Peninsula is located in the northern tip of the Philippine Sea Plate. However, the GPS vectors of the Izu Peninsula are almost westwards, which are different from the northwestward motion of the Philippine Sea Plate. A seismically active area in the east off the Izu Peninsula might be the deformation zone between the Izu Peninsula and the main part of the Philippine Sea Plate or at times be regarded as the boundary between the Izu microplate and the Philippine Sea Plate. The suspected boundary might be rather a complex fracture zone than a simple boundary. In this view, the Izu microplate is pushed northwestwards by the Philippine Sea Plate and rotates clockwise, pivoting on the base of the Izu Peninsula. The rotation causes an almost westward motion under the Suruga Bay. The interplate coupling under the Sugura Bay is not weak.〔"Interplate coupling in the Tokai District, Central Japan, deduced from continuous GPS data" by T. Sagiya〕 The Tanna Fault is part of the North Izu Fault Zone (or Kita-Izu Fault Zone) (北伊豆断層帯). The North Izu Fault Zone is about 32 km long, lying in the NNE-SSW direction. This fault zone is predominantly of left-lateral strike-slip faulting with an estimated left-lateral slip rate of about 2 m per 1000 years.〔http://www.jishin.go.jp/main/chousa/katsudansou_pdf/38_kitaizu.pdf〕 The 1930 North Izu earthquake was identified with the movement of the Tanna Fault. The focal mechanism was left-lateral strike-slip faulting.〔http://sk01.ed.shizuoka.ac.jp/koyama/public_html/tanna/tanna.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1930 North Izu earthquake」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.