Gas bubble fountain
At 7:03 am of Nov. 20,1986, suddenly a big explosion occured on the lava lake in central crater of Miharayama, Izu-Oshima, central Japan. This lava lake was formed by Stromboli type fountain that low viscosity.magma from vent-A. The viscosity of magma become higher since eruption start time. This type eruption brings with big sound and visible shock wave in the cloud.
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Fig-1 Animation of gas bubble fountain on Nov. 20, 1986.
This animation was made from captured source taken by TBS on the helicopter. Then size up and some drawings were attached by T. CHIBA on the PHOTOSHOPTM and GifBuilderTM.
 | The gas bubble fountain made many big bomb This photograph taken by S. ITO studant of Nihon-u from Gojinka-tyaya on about 12:00 AM of Nov. 21, 1986. |
 Fig-3 Water dome of geyser in Iceland That gas bubble fountain similar to the water dome of the Great Geysir in Iceland. ( © Photo: Sigurtur Demetz Franzson ) |
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