Postcard Sets of Izu-Oshima Volcano 1986 Eruption


    Fissure eruption on the caldera floor, north of Miharayama.
    Nov.21, 17:20 (photo by H. Kamata)

    Aerial view of Izu-Oshima Volcano on Dec.1
    (photo by PASCO Co. Ltd.)

    Eruption at the Miharayama crater showing molten lava.
    Nov.16, 14:04 (photo by M. Shirao)

    Streams of incandescent lava cascading
    the northern slope of Miharayama.
    Nov.19, 17:00 (photo by M. Shirao)

    Lava fountain 300 meters high at the Miharayama crater.
    Two days after the beginning of the eruption.
    Nov.17, 16:42 (photo by M. Shirao)

    Lava spattered from the Miharayama crater.
    Three days after the beginning of the eruption.
    Nov. 18, 14:48 (photo by M. Shirao)

    Front of lava flow that overflowed the Miharayama crater.
    Lower right (photomicrographs) showing plagioclase
    phenocrysts and fine-grained matrix.
    Nov.18, 16:05 (photo by M. Shirao)

    Surging lava driven by expanded gas at the Miharayama crater.
    Nov.20, 11:32 (photo by M. Shirao)

    Solidified lava flows on the northern slope of Miharayama.
    Brief calm just before fissure eruptions.
    Nov.21 (photo by T. Miyazaki)

    Fissure eruption starts with vapor and ash emission on
    the caldera floor, north of Miharayama.
    Nov.21, 16:23 (photo by H. Kamata)

    Volcanic fireworks illuminating night sky. Blobs of lava
    from eruptive fissure rotate and follow parabolic paths.
    Nov.21, 17:20 (photo by M. Shishikura)

    Eruptions from craters arranged en echelon on the caldera
    floor, north of Miharayama and a flock of crows.
    Nov.21, 16:43 (photo by T. Miyazaki)

    Subplinian eruption cloud seen from the Boso peninsula.
    Nov.21, 16:30 (photo by K. Kurokawa)

    Fissure eruption on the caldera floor and on the northern
    slope of Miharayama on Nov.21.
    Beginning of eruption (upper left, 16:15),
    ash column at early stage of eruption (upper right, 16:19),
    eruptions from craters arranged en echelon (lower left, 16:34),
    climax of eruption (lower right, 16:59) (photo by K. Abe)

    Rows of craters caused by fissure eruptions (Nov.21)
    on the northwestern slope of the somma.
    The lava reached 150 meters short of
    the Izu-Oshima Volcanological Observatory,
    Motomachi town. Dec.29 (photo by M. Shirao)

    Southeastern part of the eruptive fissure (crater row)
    that opened on Nov.21, on the northeastern rim of
    the Miharayama summit crater. Dec.29 (photo by M. Shirao)

    Geologic Map of Izu-Oshima Volcano