Three-dimensional resistivity structure in Ishikari Lowland, Hokkaido, northeastern Japan-Implications to strain concentration mechanism

Yamaya Yusuke; Mogi Toru; Honda Ryo; Hase Hideaki; Hashimoto Takeshi; Uyeshima Makoto

タイトル	en Three-dimensional resistivity structure in Ishikari Lowland, Hokkaido, northeastern Japan-Implications to strain concentration mechanism
作成者	en Yamaya, Yusuke en Mogi, Toru en Honda, Ryo en Hase, Hideaki en Hashimoto, Takeshi NRID 1000070283588 en Uyeshima, Makoto
アクセス権	open access
権利情報	en Copyright 2017 American Geophysical Union. Yamaya, Y., T. Mogi, R. Honda, H. Hase, T. Hashimoto, and M. Uyeshima (2017), Three-dimensional resistivity structure in Ishikari Lowland, Hokkaido, northeastern Japan—Implications to strain concentration mechanism, Geochem. Geophys. Geosyst., 18, 735–754, doi:10.1002/2016GC006771. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
主題	NDC 450
内容注記	Abstract en The Ishikari Lowland on the island of Hokkaido in northeastern Japan is situated at the end of a westward-moving foreland fold-and-thrust belt from the Hidaka collision zone, where the northeastern Japan and Kurile arcs meet. This activity forms a tectonic zone under an east-west compression field in this region. A magnetotelluric resistivity survey was performed to investigate the mechanism for the strain concentration in this region. A three-dimensional (3-D) resistivity inversion showed a conductive thick sedimentary layer and an underlying resistive basement. Remarkable conductors were found in the resistive basement beneath the Ishikari-teichi-toen fault zone (ITFZ) and the Shikotsu caldera. The conductors beneath the ITFZ were interpreted as aqueous fluids that accumulated in the damaged zone in connection with the formation of pull-apart faults and horst. In contrast, the conductor beneath the Shikotsu caldera corresponds to a magmatic fluid path from the upper mantle. These features suggest that the ductile deformation in the upper crust contribute to the strain concentration in this region. The soft thick sediments allow ductile deformations to occur. Furthermore, local fluid-rich zones in the basement cause the crustal strength to be heterogeneous. These thick sediments and local fluids in the basement both contribute to the strain concentration in this region.
出版者	en American Geophysical Union
日付	Issued2017-02-28
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/67051
関連	isIdenticalTo DOI https://doi.org/10.1002/2016GC006771
収録誌情報	PISSN 1525-2027 en Geochemistry, Geophysics, Geosystems 巻18 号2 開始ページ735 終了ページ754
ファイル	fulltext GGG18-2 735-754.pdf 4.7 MB (application/pdf) Issued2017-02-28 fulltext Supporting Information.pdf 1.87 MB (application/pdf) Issued2017-02-28
コンテンツ更新日時	2023-07-26