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Hokkaido University Collection of Scholarly and Academic Papers >
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Three-dimensional resistivity structure in Ishikari Lowland, Hokkaido, northeastern Japan-Implications to strain concentration mechanism
| Title: | Three-dimensional resistivity structure in Ishikari Lowland, Hokkaido, northeastern Japan-Implications to strain concentration mechanism |
| Authors: | Yamaya, Yusuke Browse this author | | Mogi, Toru Browse this author | | Honda, Ryo Browse this author | | Hase, Hideaki Browse this author | | Hashimoto, Takeshi Browse this author →KAKEN DB | | Uyeshima, Makoto Browse this author |
| Issue Date: | 28-Feb-2017 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geochemistry, Geophysics, Geosystems |
| Volume: | 18 |
| Issue: | 2 |
| Start Page: | 735 |
| End Page: | 754 |
| Publisher DOI: | 10.1002/2016GC006771 |
| Abstract: | 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. |
| Rights: | 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. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/67051 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 橋本 武志
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