伊豆大島火山：史料に基づく最近3回の大規模噴火の推移と防災対応

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(2) - 7 ¡! ¢£¤¥!! ¦§¨©ª!!! «¬¤ª!!!! ,**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 Izu-Oshima Volcano : Precise Sequence and Mitigation Program of the Latest Three Large-Scale Eruptions Revealed by Historical Documents ῍῍ and Kouichiro HAYASHI῍῍῍῍ Masashi TSUKUI῍, Kazuyuki DANGI῍῍, Shozaburo SATO῍ Inflation of Izu-Oshima volcano has been observed since soon after the latest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 occurred in +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 historic time. 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, which is 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 the former 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 by frequent 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 in caldera, 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 Key words : Izu-Oshima volcano, historical eruptions, historical documents, sequence of an eruption, hazard mitigation program. JKLMNOP QRSJKT /** EUVWXYZ[. +ῌ ῐ ῎ ῑ ῏. \],^K_TàW66bc +** km W\]. de. fOP JKg +323 ENhijT_kWlmLnop. qrWs= K_tuvwxyz{|}x~ij. V A/. +330 WJK L. |K_[f| Fig. + WJKT +320 E ++. xxjR|jR| w ,**1. F +/ Gx_[V ,+ GxTsb_[QRS. . ! ",0-ῌ2/,, #$%&'()*+ +ῌ-#$,-,-./-012 Graduate School of Science, Chiba University, Inageku, Chiba, ,0-ῌ2/,, Japan. !! 9:;,-<-= 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. !!!! "2++ῌ+-*, 34534%6(78 ,ῌ,+ῌ-0

(3) Kyushu Headquarter, OYO Corporation, ,ῌ,+ῌ-0 Ijiri, Minami-ku, Fukuoka, 2++ῌ+-*, Japan. Corresponding author : Masashi Tsukui e-mail : [email protected].

(4) . 94. Fig. +. Map showing topography and distribution of scoria cones, fissure vents, and caldera rims of Izu-Oshima volcano. Topographic contour interval is +** m.. ! "#

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(129) o$cial documents submitted from Izu-Oshima in +1.3 , .

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