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)

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

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

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

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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)

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

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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)

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

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

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

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

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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)

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

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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)

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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)

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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)


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Geologic Map of Izu-Oshima Volcano

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