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M. Kasahara
Hokkaido Univ.
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H. Takahashi
Hokkaido Univ.
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M. Okayama
Hokkaido Univ.
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H. Miyamachi
Kagoshima Univ.
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K. Heki
N. A. O., Mizusawa
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Mefodi Maguskin
Institute of Volcanology, Russia
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Vassily Levin
Institute of Volcanology, Russia
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Vilory Bahtiarov
Institute of Volcanology, Russia
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Evgenii Gordeev
Geophysical Service, Russia