2010 Fiscal Year Final Research Report
Comprehensive research on large earthquake occurrence potential in the concentrated deformation zone along the Japan Sea eastern margin
| Project/Area Number |
20500891
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Chiba University |
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Principal Investigator |
MIYAUCHI Takahiro Chiba University, 大学院・理学研究科, 教授 (00212241)
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| Co-Investigator(Renkei-kenkyūsha) |
ITO Tanio 千葉大学, 大学院・理学研究科, 教授 (50111448)
TSUMURA Noriko 千葉大学, 大学院・理学研究科, 助教 (00272302)
YOSHIDA Shuji 千葉大学, 大学院・理学研究科, 准教授 (50400809)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 地形 |
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| Research Abstract |
The differential uplift showing tilting and warping of late Quaternary marine terraces along a 500 km long coast of this eastern margin of Japan Sea is understood due to offshore causative fault movements and related large earthquakes. Shallow submarine reverse fault segments close to the coastlines are undoubtedly responsible for coastal uplift and accumulative marine terrace tilting and warping. Calculating co-seismic displacement distribution to be best fit to paleoshoreline records indicates earthquake magnitude in the range of Mw 6.7-7.6 and recurrence time of several thousand years. This implies that this region has high probability of large magnitude earthquakes accompanied by coastal uplift, which will happen somewhere in near future. Particularly in the several areas, Okushiri Island, Matsumae Peninsula, western margin of Hakodate Plain, Henashi Peninsula and Tobishima Island, where present abrasion platforms widely develop, the next large earthquakes seem imminent.
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[Journal Article] Variations of fluid pressure within the subducting oceanic crust and slow earthquakes2010
Author(s)
A.Kato, T.Iidaka, R.Ikuta, Y.Yoshida, K.Katsumata, T.Iwasaki, S.Sakai, C.Thurber, N.Tsumura, K.Yamaoka, T.Watanabe, T.Kunitomo, F.Yamazaki, M.Okubo, S.Suzuki, N.Hirata
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Journal Title
Geophys.Res.Lett. 37
Pages: L14310, doi:10.1029/2010GL043723
Peer Reviewed
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[Journal Article] A bump on the upper surface of the Philippine Sea plate beneath the Boso Peninsula, Japan inferred from seismic reflection surveys : A possible asperity of the 1703 Genroku earthquake2009
Author(s)
N.Tsumura, N.Komada, J.Sano, S.Kikuchi, S.Yamamoto, T.Ito(6), T.Sato, T.Miyauchi, T.Kawamura, M.Shishikura, S.Abe, H.Sato, T.Kawanaka, S.Suda, M.Higashinaka, T.Ikawa
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Journal Title
Tectonophysics
Pages: doi:10.1016/j.tecto.2008.05.009
Peer Reviewed
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[Journal Article] Crustal structure of southwest Japan, revealed by the integrated seismic experiment Southwest Japan 2002009
Author(s)
T.Ito, Y.Kojima, S.Kodaira, H.Sato, Y.Kaneda, T.Iwasaki, E.Kurashimo, N.Tsumura, A.Fujiwara, T.Miyauchi, N.Hirata, S.Harder, K.Miller, A.Murata, S.Yamakita, M.Onishi, S.Abe, T.Sato, T.Ikawa
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Journal Title
Tectonophysics
Pages: doi:10.1016/j.tecto.2008.05.013
Peer Reviewed
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