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,**2 E 3 F - GHI ,**3 E / F ,+ GH/Izu-Oshima Volcano : Precise Sequence and Mitigation Program of the Latest
Three Large-Scale Eruptions Revealed by Historical Documents
῍῍ and Kouichiro HAYASHI῍῍῍῍
Masashi TSUKUI῍, Kazuyuki DANGI῍῍, Shozaburo SATO῍
Inﬂation of Izu-Oshima volcano has been observed since soon after the latest middle-scale eruption occurredin +320. Such deformation is understood as re-storage of magma beneath the volcano. Because more than ,-*years have passed since the last large-scale eruption in +111, Izu-Oshima is overdue for an average recurrence
interval of large-scale eruptions, +** to +/* years.
Preparing for the forthcoming eruption, we aime to improve the resolution of volcanic activities in historictime. Archives on historical eruptions, as well as topography, and stratigraphy of the volcano are reviewed. The
results are summarized as follows. (+) Based on historical archives as well as stratigraphy of the volcano, we
reviewed sequences of Y- (+//, Ten’bun), Y, (+02. Jokyo) and Y+ (+111 An’ei) eruptions. All these three
eruptions occurred inside the caldera and proceeded in the order of scoria fallout - lava e#usion - ash fall, whichis the typical sequence in Izu-Oshima. Duration of main eruption stage, start from basal scoria eject to lava
e#usion, ranges from + to , weeks in Y- and Y, eruptions, to +../ months in Y+ eruption which is bigger than theformer two. Those of magma-withdrawal stage, ash-fall stage, lasted 0 years in Y, and 3 years in Y+, respectively.
(,) In Y+ eruption (+111ῌ+13,), the local government of Izu grasped the sequence of volcanic activities byfrequent reports from the island and by inspections of government o$cers. The local government submitted
reports and mitigation programs to the central government. (-) In case of future large-scale eruption occur incaldera, accurate information of magma-head level is indispensable for the prediction of eruption behavior. (.)
We pointed out the signiﬁcance of topographic lows on the northwestern and the northern ﬂank to predict the ﬂow
of lavas.
Key words : Izu-Oshima volcano, historical eruptions, historical documents, sequence of an eruption, hazard
mitigation program

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Graduate School of Science, Chiba University, Inageku, Chiba, ,0-ῌ2/,, Japan.
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the former a$liation : Faculty of Letters, Hosei University!!! ",12ῌ**-1 #$5>?%>? -1*ῌ2>?%@ABCD
Noda City Museum, -1*ῌ2 Noda, Noda, Chiba, ,12ῌ**-1, Japan.
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Kyushu Headquarter, OYO Corporation, ,ῌ,+ῌ-0Ijiri, Minami-ku, Fukuoka, 2++ῌ+-*, Japan.
Corresponding author : Masashi Tsukui
e-mail : tsukui@faculty.chiba-u.jp   

94

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Izu-Oshima volcano. Topographic contour interval is +** m.

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95

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-ῌ,ῌ+ Table +. Volume and mass of Younger Oshima Group(after Nakamura, +30. ; Sakaguchi, et al., +321).
Eruption years of S,, N,, N+, Y0 are revised after
Yamamoto (,**0) and Tsukui et al. (,**0). Dense
Rock Equivalent (DRE) is calculated assuming
magma density of ,.1 g/cm-.

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+

Sequence of recent large-scale eruptions Y+, Y, and Y- of the Younger Oshima Group.

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distribution of Y+, Y, and Y- members, compiled
from Nakamura (+30.), Isshiki (+32.b), Koyama
and Hayakawa (+330) and Kawanabe (+332). Solidline : basal scoria ; broken line : ash layer.

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Nakamura, +30. &(#$%&'()*&

100
Table -.

Population and number of cargo boat in Oshima Island in the +2th century.

References : +   
o$cial documents submitted from Izu-Oshima in +1.3  ,  
documents about Izu Islands submitted to the central government submitted from the
Local government of Izu in +11.  -  
duplicate of documents on Izu Islands
submitted to the central government in +111 the Local government of Izu  . 
o$cialdocuments on Izu-Oshima eruption in +111ῌ+112 submitted from the Local government of Izu  / Inspection report of Izu Islands in +12+ῌ2,  0  
o$cial documents submitted
from Izu-Oshima in +123

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101

Fig. -. Distribution of Y/, Y- and Y+ lavas. These ﬂows are strongly controlled by topographic
depressions. Contour interval is ,* m. Note topographic depressions on the southeast ofMotomachi town and on the north of caldera rim.

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Nakamura +30. q¬ .., -./ 0./ ­®¯CD - E F # ^f]X)'°±6e5p" q¬ #²³´±%&#'^9¤<=%9) >0VWDX Y>6µ¶ Y- Y, «/F Y+  f.L ,%5=) pqeB^ f]rB:·f]p¸ +./  , 1Y() ¹2X

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V& . ,**1 ' *k)YZ 11 +-*1ῌ+-++.
Nakamura, K. (+30*) Stratigraphic studies of the pyroclastics of Oshima Volcano, Izu, deposited during the lastﬁfteen centuries. I. cyclic activity of “main craters” andthe absolute chronology of the pyroclastic sediments. Sci.
Pap. Coll. General Educ., Univ. Tokyo, +*, +,/ῌ+./.
Nakamura, K. (+30+) Stratigraphic studies of the pyroclastics of Oshima Volcano, Izu, deposited during the lastﬁfteen centuries. II. activity of parasitic volcanoes. Sci.
Pap. Coll. General educ., Univ. Tokyo, ++. ,2+ῌ-+3.
Nakamura, K. (+30.) Volcano-stratigraphic study of Oshima
Volcano, Izu. Bull. Earthq. Res. Inst., Univ. Tokyo, .,,0.3ῌ1,2.
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