Affiliation: | 1. Northern Advancement Center for Science and Technology, H-RISE, 5-3 Sakaemachi, Horonobe-cho, Teshio-gun, Hokkaido, 098-3221, Japan 2. Rock Mechanics Laboratory, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-Ku, Sapporo, Hokkaido, 060-8628, Japan
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