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Fumiaki Kobayashi
Department of Geoscience, National Defense Academy, Yokosuka, 239-8686, Japan
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Takatsugu Shimura
Department of Geoscience, National Defense Academy, Yokosuka, 239-8686, Japan
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Atsushi Wada
Central Research Institute of Electric Power Industry, Yokosuka, 240-0196, Japan
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Kazuo Shinjo
Hokuriku Electric Power Company, Toyama, 930-0848, Japan