Intersected Structure and Superpose Tectonics between the Eastern Margin of Japan Sea and the Toyama Trough, central Japan

日本海东缘与日本中部富山海槽的交错构造与叠加构造

• 批准号: 17540434
• 负责人: TAKEUCHI Akira
• 金额: $ 2.27万
• 依托单位: University of Toyama
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17540434/
• 关键词: zone of strain concentration; Eastern Margin of Japan Sea; inversion tectonics; intersecting structure; methane hydrate; GPS geodetic survey; seismogenic fault; crustal earthquake; 地殻変動; 富山トラフ; 活摺曲帯; 能登半島地震; 中越沖地震; 変動地形; テクトニクス; 活構造; 直下型地震

This study had conducted geomorphologic survey utilizing multi-narrow beam swath bathymetry and acoustic imaging by side scan sonar and sub-bottom profiler in the Japan sea-area, As the results the following were elucidated (1) The Pliocene and later folding and related fracturing had developed surfacial layers of methane hydrate as shallow as the uppermost layer is outcropped on the sea bottom to be observed by the submersible vehicle. It was assured that hydrate domes similar to salt domes have been formed on structural highs where migration and upwelling of methane are localized along the anticline axes.On land, we have continued our GPS geodetic monitoring of the present-day ongoing crustal deformation. The results confirmed the distribution of active faults across both regions in land and sea, and also intersecting relationships among them. Our seismo-geological surveys on the Atotsugawa fault system, one of the most active faults in Japan, made clear that the eastern-half segment of seismogenic faults had also been activated at the latest event in 1858 as well as the western, suggesting the deep intersection of basement structure in a N-S trend and NE-SW trending weak zone called the Niigata-Kobe tectonic belt.In order to resolve the dynamics of intersection, we will promote an integrated comprehensive study among geophysics, geodesy, geology and other material sciences on the mechanical relationship between tectonic phenomena and those in the lower crust beneath seismogenic zone. In 2008 and after, we join the five-year research and monitoring program for the zone of tectonic strain concentration along the eastern margin of Japan Sea.

本研究利用多窄波束测深和侧扫声纳和海底剖面仪声学成像对日本海域进行了地貌调查，结果阐明了以下内容：（1）上新世及后来的褶皱和相关压裂已开发出甲烷水合物表层，最上层露出海底，可以通过潜水器进行观察。可以肯定的是，类似于盐丘的水合物丘已经形成在构造高处，甲烷的迁移和上涌集中在背斜轴上。在陆地上，我们继续对当前正在进行的地壳变形进行 GPS 大地测量。结果证实了活动断裂在陆地和海洋两个区域的分布，以及它们之间的交叉关系。我们对阿十津川断层系（日本最活跃的断层之一）进行的地震地质调查清楚地表明，在 1858 年的最新事件中，发震断层的东半段以及西段也被激活，这表明了新泻-神户构造带是北-南向基底构造与北东-西向构造薄弱带的交汇处。地球物理学、大地测量学、地质学和其他材料科学研究构造现象与地震带下地壳现象之间的力学关系。 2008年及以后，我们参加了日本海东缘构造应变集中区为期五年的研究和监测计划。

项目成果

Postseismic displacements following the 2007 Noto peninsula earthquake detected by dense GPS observation

通过密集 GPS 观测检测到 2007 年能登半岛地震后的震后位移

• 发表时间: 2008
• 作者: Hashimoto; M.; H.Takahashi; R.Doke; M.Kasahara; A.Thkeuchi; ほか10名
• 通讯作者: ほか10名

World largest outcrop of pure hydrate on the sea floor.

海底世界最大的纯水合物露头。

• 发表时间: 2007
• 作者: Takeuchi; A.; J.Zhang; U.sunogai; K.Kishimonto; K.Nishimjura; M.Kitada; S.Saegusa; T.Maekawa; Y.Minamino; Y.Dike; M.Takaesu
• 通讯作者: M.Takaesu

Paleoseismology of deep-sea faults based on marine surveys of the northern Okushiri ridge in the Japan Sea

基于日本海奥尻海脊北部海洋调查的深海断层古地震学

• 发表时间: 2005
• 作者: Okamura; Y
• 通讯作者: Y

Seismogeology of the Atotsugawa strike-slip fault system in the Hida Mountains, central Japan with the special reference to the investigation gallery across the branch Mozumi-Sukenobe Fault.

日本中部飞驒山脉安津川走滑断层系的地震地质学，特别涉及跨越分支莫住-助延断层的调查廊道。

• 发表时间: 2007
• 作者: Takeuchi; A; Takebe; A.; Hasibateer; O.;Doke; R.
• 通讯作者: R.

Paleoseismology of deep-sea faults based on marine surveys of the northern Okushiri ridge in the Japan Sea.

基于日本海奥尻海脊北部海洋调查的深海断层古地震学。

• 发表时间: 2005
• 作者: Okamura; Y.; K. Satake; K. Ikehara; A. Takeuchi;K. Arai
• 通讯作者: K. Arai