2001 Fiscal Year Final Research Report Summary
Research on the crustal deformation and its processes of northern Honshu, Japan, based on seismic profiling
| Project/Area Number |
12309002
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
広領域
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SATO Hiroshi The Univ. of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (00183385)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Naoshi The Univ. of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (90156670)
IWASAKI Takaya The Univ. of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (70151719)
UMINO Norihito Tohoku Univ., Graduate school of Science, Associate Professor, 大学院・理学研究科, 助教授 (30004477)
YOSHIDA Takeyoshi Tohoku Univ., Graduate school of Science, Professor, 大学院・理学研究科, 教授 (80004505)
IKEDA Yasutaka The Univ. of Tokyo, Graduate school of Science, Associate Professor, 大学院・理学系研究科, 助教授 (70134442)
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| Project Period (FY) |
2000 – 2001
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| Keywords | deep seismic profiling / crustal structure / basin development / back arc basin / Northern Honshu / rift system / Neogene / Japan |
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| Research Abstract |
Northern Honshu, Japan, is a classical example of a trench-arc-back arc basin system, and provides exceptional opportunities for better understanding plate subduction. In this research, data from deep seismic profiles, petrology and petroleum geology are used to construct a geologic framework for the late Cenozoic development of the back arc area of central northern Honshu. In particular, the deep seismic reflection profiling using four vibroseis trucks and dynamites was performed across the Dewa hills (Yuri hills). The resultant compiles cross section across the central part of the Northern Honshu (Kamaishi to Honjo), portrays the two Miocene rift systems : the Yamato basin rift system along the eastern part of the sea of Japan and the northern Honshu rift system in the western part of northern Honshu island. The eastern part of the Yamato basin rift system is marked by half grabens bound by west-dipping Miocene normal faults, with the thickness of the crust decreasing toward the west due to early Miocene crustal stretching. The northern Honshu rift system is younger, forming in the middle Miocene, and produced the Akita-Yamagata sedimentary basin by a simple shear type of rifting. Basalts were erupted in conjunction with rifting. This produced a high thermal regime, and a shallow brittle/ductile detachment, formed along the rift axis with associated thinning of the upper crust. Middle Miocene basin development was mainly controlled by normal faulting along the detachment. Based on our balanced geologic cross-section, the total amount of Miocene extension of the northern Honshu rift system is ca. 40 km. Due to subsequent shortening since Pliocene, the low-angle detachment was reactivated as a thrust.
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[Journal Article] Deep Seismic Reflection Profiling across the Ou Backbone Range, Northern Honshu Island, Japan2002
Author(s)
Sato, H., Hirata, N., Iwasaki, T., Matsubara, M., Ikawa, T.
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Journal Title
Tectonophysics 355
Pages: 41-52
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Tectonic evolution and deep to shallow geometry of Nagamachi-Rifu Active Fault System, NE Japan2002
Author(s)
Sato, H., Imaizumi, T., Yoshida, T., Ito, H., Hasegawa, A.
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Journal Title
Earth Planet.Space 54
Pages: 1039-1043
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] High resolution, very shallow seismic reflection profiling across active faults : A case study of the Senya fault, Akita Prefecture, Japan2001
Author(s)
Matsuta, N., Imaizumi, T., Pratt, T., Williams, R., Sato, H., Kurashimo, E., Kato, N., Ogino, S., Moriya, H.Abe, S.
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Journal Title
Active Fault Research 20
Pages: 40-45
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Significance of imaging seismogenic and active fault systems for earthquake hazard mitigation2001
Author(s)
Sato, H., Ito, T., Iwasaki, T., Ikeda, Y., Hirata, N., Imaizumi, T., Ikawa, T.
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Journal Title
Journal of Geography 110
Pages: 838-848
Description
「研究成果報告書概要(欧文)」より
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