Slab avalanches occurred at Mt. Kamihorokamettoku, Tokachi Mountain Range, in Hokkaido in November 2007

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  • 2007年11月に北海道上ホロカメットク山で連続発生した雪崩
  • 2007ネン 11ガツ ニ ホッカイドウ カミホロカメットクサン デ レンゾク ハッセイシタ ナダレ

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Abstract

Slab avalanches occurred at Mt. Kamihorokamettoku in Hokkaido Prefecture in November 2007. The first slab avalanche occurred on the western slope of Mt. Kamihorokamettoku on November 13, 2007, and one person was caught in the avalanche. On November 23, 2007, persons were caught in a slab avalanche that occurred on the northern slope of the ridge of Mt. Kamihorokamettoku, and persons were killed. The Hokkaido branch of the Japanese Society of Snow and Ice (JSSI) dispatched an avalanche research team, which had been newly organized during the winter of 2007-2008, to Mt. Kamihorokamettoku. The research team consisted of researchers and mountain guides who ensure the safety of the team. Field investigations were carried out on November 17 and 25 in order to determine the avalanche characteristics and snow structures. The existence of weak layers was confirmed by pit observations. The weak layers of both the western slope and northern slope avalanches consisted of faceted crystals depth hoar crystals

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