-
T. Hashimoto
Fac. Sci. Hokkaido Univ.
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M. Nishimura
Magnetic Observatory, JMA
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T. Yamamoto
Sapporo Dist. Meteorol. Obs., JMA
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S. Arita
Magnetic Observatory, JMA
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N. Shigeno
Seismol. & Volcanol. Dept., JMA
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M. Ogiso
Sapporo Dist. Meteorol. Obs., JMA
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N. Okazaki
Geol. Surv. Hokkaido
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T. Mogi
Fac. Sci. Hokkaido Univ.