2005 Fiscal Year Final Research Report Summary
Search for hidden fracture zones from dense gravity survey and remote sensing
| Project/Area Number |
14208044
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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 |
Natural disaster science
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| Research Institution | Nagoya University |
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Principal Investigator |
ADACHI Mamoru Nagoya University Museum, Professor, 博物館, 教授 (10113094)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Hidekazu Nagoya University Museum, Associate Professor, 博物館, 助教授 (30324403)
YAMAGUCHI Yashushi Nagoya University, Graduate School of Environmental Studies, Professor, 大学院・環境学研究科, 教授 (80283472)
SUZUKI Kazuhiro Nagoya University, Center for Chronological Research, Professor, 年代測定総合研究センター, 教授 (90111624)
SHICHI Ryuichi Chubu University, College of science engineering, Professor, 工学部, 教授 (50022596)
YAMAMOTO Akihiko Ehime University, Graduate school of science and engineering, Professor, 理学部, 教授 (80191386)
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| Project Period (FY) |
2002 – 2005
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| Keywords | Dense gravity survey / Gravity anomaly / Biwajima-Atsuta Fault / Atsuta-Nisshin Fault / Atera Fault / Fault fracture zone / Nobi Plain / Pull-apart basin |
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| Research Abstract |
(1) On the basis of our new gravity data together with the gravity database of Gravity Research Group of Southwest Japan, "Gravity Anomaly Atlas of the Japanese Islands : South-West and Central Japan" (editors : Yamamoto, A. and Shichi, R.) was published in November 2004.
(2) A new gravity anomaly map was drawn from a total of 1328 new gravity measurements in Nagoya City and its environs. The gravity anomaly data combined with bore-hole and surface geology data show that the vertical displacement of pre-Tertiary basements of the Biwajima-Atsuta Fault and the Atsuta-Nisshin Fault is approximately 550m and 350m, respectively.
(3) Judging from a dense gravity survey, geological investigation and lineament analysis of the Miya basin area in northern Gifu Prefecture, the Miya basin was formed as a pull-apart basin by right-lateral movements of the Miya-toge and Enako Faults running parallel in NE-SW trend.
(4) A detailed fracture mapping and geochemical analysis of granitic rocks in the Atera fault zone reveal that the influence of fracturing of the Atera Fault on the granitic rocks is prominent within 250m from the main fault plane.
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