2001 Fiscal Year Final Research Report Summary
Investigation of magmatic processes and reconstruction of magma feeding system of active volcano based on precise eruption history
| Project/Area Number |
11640471
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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 |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
NAKAGAWA Mitsuhiro Hokkaido Univ., Grad. School of Sci, Inst., 大学院・理学研究科, 助手 (50217684)
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| Co-Investigator(Kenkyū-buntansha) |
UI Tadahide Hokkaido Univ., Grad. School of Sci., Prof., 大学院・理学研究科, 教授 (10007164)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Active volcano / Magma plumbing system / Petrology / Eruption / Usu volcano / Miyake-jima volcano / Eruption history / Hokkaido-Komagatake |
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| Research Abstract |
Based on precise eruption history and sequence, we investigated temporal evolution of magma plumbing systems of several active volcanoes. Main results are as following. 1)Although mixed magmas erupted in 1663 and 1769 eruptions of Usu volcano, end-member magmas of each mixed magma were distinct. Thus previous petrologic model of the volcano must be revised. In addition, we revealed petrological features of juvenile materials of the 2000 eruption. 2) Magma system of deeper basaltic and shallower andesitic magma chambers had evolved since 1469 eruption beneath Miyake-zima volcano. However, the system has been destroyed during the 2000 eruption. This suggests that the volcano might not erupt every 20-30 years as in 20^<th> century, because magma system would be reconstructed after the 2000 eruption. 3)Shallower mush chamber had been injected frequently by deeper basaltic magma during several months before 1995 eruption sequence of Ruapehu volcano, resulting to form several small mixed magma pockets. The pockets had erupted sequentially during eruptive activity for two months. 4) We reveal eruption history during the last 1000 years of Tyatya volcano by using wide-spread tephras. We also investigate detail eruption sequence of the unique 1973 eruption, which occurred northern and southern flanks of the volcanic edfice. In addition to the above, we also reveal petrological features of historical eruptive products of Hokkaido-Komagatake and Tarumai volcanoes. In these volcanoes, zoned magma chamber has been formed during the initial eruptions after long dormancy.
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Research Products
(24 results)
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[Publications] Nakagawa, M., Nogami, K., Ishizuka Y., Yoshimoto, M., Takahashi, R., Ishii, E., Egusa, M., Miyamura, J., Shiga, T., Okazaki, N., Ishimaru, S.: "The 2000 eruption of Hokkaido-Komagatake volcano and its significance : Evidence for increasing effect of magma deduced from temporal variations of eruptive materials and adhered gas component on ash"Bull. Volcanol. Soc. Japan. 46-6. 295-304 (2001)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Nakagawa, M., Ishizuka, Y., Yoshimoto, M., Kudo, T., Aizawa, K., Kitagawa, J., Hiraga, N., Matsumoto, A., Togari, H., Takahashi, R., Ishii, E., Egusa, M., Seine, T., Wada, K., Niida, K.: "Eruptive materials of the 2000 eruption of Usu volcano, northern Japan : Component materials and their temporal change"Bull. Volcanol. Soc. Japan. (in press).
Description
「研究成果報告書概要(欧文)」より
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[Publications] Igarashi, Y., Igarashi, T., Endo, K., Yamada, O., Nakagawa, M., Sumita, M.: "Vegetation history since the Late Glacial of Habomai Bog and Ochiishi Cape Bog, Nemuro Peninsula, eastern Hokkaido, north Japan"Jpn. Jour. Histoy. Bot.. 10-2. 67-79 (2001)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Nishimura, Y., Miyaji, N., Yoshida, M., Murata, T., Nakagawa, M.: "The 1843 Tsunami deposits found in the peat deposits at Kiritappu Marsh, eastern Hokkaido, Japan"The Quaternary Research. 39-5. 451-460 (2000)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Nakagawa, M., Wada, K., Thordarson, T., Wood, C.P., Gamble, J.A.: "Petrologic investigations of the 1995 and 1996 eruptions of Ruapehu volcano, New Zealand : formation of discrete and small magma pockets and their intermittent discharge"Bull. Volcanol.. 61-1. 15-31 (1999)
Description
「研究成果報告書概要(欧文)」より
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