Phreatomagmatic eruptions associated with the caldera collapse during the Miyakejima 2000 eruption,Japan |
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Authors: | Nobuo Geshi Teruki Oikawa |
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Institution: | Geological Survey of Japan, AIST, AIST No.7 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan |
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Abstract: | The 2000 AD eruption of Miyakejima was characterized by a series of phreatomagmatic eruptions from the subsiding caldera. Six major eruptive events occurred, and they can be divided into the first and second periods separated by a 25-day hiatus. The phreatomagmatic eruptions produced a total of ~ 2 × 1010 kg of tephra, which mainly comprised fine-grained volcanic ash. The tephra layers could be divided into six fall units corresponding to the six major eruptive events. |
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Keywords: | caldera phreatomagmatic eruption tephra basaltic volcano Miyakejima |
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