2007 Fiscal Year Final Research Report Summary
Eruptions and earthquakes in and around Izu Arc area during the ninth century ; aiming the understandings of the tectonics
| Project/Area Number |
17540430
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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 |
Geology
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| Research Institution | Chiba University |
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Principal Investigator |
TSUKUI Masashi Chiba University, school of Science, Associate Professor (50192191)
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| Co-Investigator(Kenkyū-buntansha) |
HIROI Yoshikuni Chiba University, Graduate School of Science, Professor (40019427)
FURUKAWA Nobotu Chiba University, Graduate School of Science, Research Associate (40251194)
NAKANO Shun AIST, Geological Survey of Japan, Institute of Geology and Geoinformation Volcanic Activity Research Group, Group Leader (40357645)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Izu Islands / 9th century / historical document / linkage of eruptions and earthquakes / tectonics / Amurian Plate eastern margin / E-W shortening |
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| Research Abstract |
Aiming to clarify the unique tectonics in and around to northern part of Izu Arc in the 9th century, we re-examined eruptions and seismicity occurred in the northern part of Izu Arc in the century.
Based on geological, archaeological data and historical documents, we confirmed that eruptions and earthquakes were really vigorous in that period, as so far pointed out Big eruptions repeatedly took place in the 9th century, at Kozushima, Niijima, Miyakejima and Oshima volcanoes. Moreover, Fuji volcano was active and a couple of big earthquakes also occurred on Kanto inland. In addition, compiled results showed that seismic activity was also at a high level including surrounding area. Destructive earthquakes successively hit along the Itoigawa-Shizuoka active fault system, Akita Plains, Shonai Plains, Echigo Plains, Nagano fault system, and Nankai trough. Niigata-Yakeyama and Chokai volcanoes also erupted in that period. These activities in the middle of the 9th century were concentrated in Izu Islands and along boundary between the East and West Japan. These suggest a linkage of big eruptions and seismic activities over 800km long crossing Japan Arc. Geologically these events seem to express the East-West shortening along eastern margin of Amurian Plate over 800km, driven by the eastward motion of the plate.
We point out the similarity of volcanic and seismic activities during the recent 50 years to those happened during the 9th century, in their source areas and manner. Some scientists that the central part of the Itoigawa-Shizuoka tectonic line active fault system and Fujigawa fault system are overdue to the average recurrence period. In this context we cannot discard the worst scenario that the collapse and eruption of Fuji volcano may follow the coming big earthquake along the eastern margin of the Amurian plate.
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Research Products
(39 results)
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[Journal Article] Deep drilling at the arc-arc collision zone in the Yamakita area, central Honshu, Japan2006
Author(s)
Sekiguchi, S., Hayashi, H., Tsukui M., Uesugi. Y., Ito, T., Tanak, Y., Takahashi, M., Yanagisawa, Y., Yamamizu, F., Obara, K., Hori, S., Shiomi, K., Kimura, H., Matsubara, M. and Kasahara, K.
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Journal Title
Bull. Earthq. Res. Inst. Univ. Tokyo 81
Pages: 291-294
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Volcanics and constraints on the shallow crustal structure of northern end of Izu arc - from Hakone and Pre-Hakone volcanic rocks recovered from deep drilling at Yamakita-minami area, Kanagawa Prefecture, central Honshu, Japan2006
Author(s)
Tsukui, M., Yamazaki, M., Matsui, T., Oyamada, H., Uesugi, Y., Hayashi, H., Yanagisawa, Y. and Kasahara, K.
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Journal Title
Bull. Geol. Surv. Japan 57
Pages: 197-215
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Rhyolite tephras from Kozushima, Niijima and Omurodasi Volcanoes in Izu Islands2007
Author(s)
Saito, K., Hayashi, K., Tamura, I., Kouno, K., Niihori K., and Tsukui, M.
Organizer
Japan Association for Quaternary Research 2007 meeting (P-03)
Place of Presentation
Kobe Univ.
Year and Date
20070831-0901
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Petrography of the deep drilling at the arc-arc collision zone in the Yamakita area, Kanagawa Prefecture, central Honshu, Japan2005
Author(s)
Yamazaki, M., Matsui, T., Oyamada, H., Tsukui, M , Uesugi, Y., Hayashi, H, Yanagisawa, Y., Tanaka Y. and Kasahara, K.
Organizer
2005 Japan Earth and Planetary Science Joint Meeting (G015-P009)
Place of Presentation
Makuhari, Chiba.
Year and Date
2005-05-24
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 10Be abundance in volcanic rocks from Izu arc and its relation with other trace elements2005
Author(s)
Gotan, K., Nakai, S. Niihori, K., Tsukui, M., Fujii, T., Nakada, S. and Matsuzaki, H.
Organizer
2005 Japan Earth and Planetary Science Joint Meeting (C003-P003)
Place of Presentation
Makuhari, Chiba.
Year and Date
2005-05-23
Description
「研究成果報告書概要(欧文)」より
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