A Phreatic Explosion after AD 1663 at the Hiyoriyama Cryptodome, Kuttara Volcano, Southwestern Hokkaido, Japan

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  • GOTO Yoshihiko
    College of Environmental Technology, Graduate School of Engineering, Muroran Institute of Technology
  • SASAKI Hirotaka
    College of Environmental Technology, Graduate School of Engineering, Muroran Institute of Technology
  • TORIGUCHI Yoshimasa
    College of Environmental Technology, Graduate School of Engineering, Muroran Institute of Technology
  • HATAKEYAMA Akira
    College of Environmental Technology, Graduate School of Engineering, Muroran Institute of Technology

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  • 北海道南西部クッタラ火山,日和山潜在ドームの山頂火口を形成した水蒸気爆発

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Hiyoriyama is a Quaternary dacite cryptodome located in Kuttara Volcano, southwestern Hokkaido, Japan. The cryptodome is 350-550m across and 130m high, with an explosion crater at the summit. Here we report on a small-volume, phreatic fall deposit (the Hy-a deposit) erupted from the crater. The deposit consists mainly of fresh to altered, dacitic lithic clasts (up to 30cm across) in a fine-grained matrix. The petrological features of the dacite are identical to those of rocks within the wall of the crater. The deposit increases in thickness and maximum grain size toward the crater, suggesting it was erupted from the crater. The Hy-a deposit overlies the Us-b tephra, which was deposited in AD 1663. The lithology, distribution, and stratigraphy of the Hy-a deposit suggest that a phreatic eruption occurred after AD 1663 at the summit of the cryptodome, resulting in formation of the crater.

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