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Hk-1 Tephra Kudo et al., 2000, 2003a
Abbr.: Hk-1
- Type locality: Mount Kodake, Aomori city, Aomori prefecture
- Holocene (1.5 cal ka BP, 14C)
- Sedimentary facies: Terrestrial
- Lithofacies: Volcanic ash
- Lithofacies (Minor): Lithic fragments, Scoria
- Mode of eruption: Phreatic
- Source: Summit crater (Kagami pond?) of Mount Odake (Kita-Hakkoda volcanoes)
- Eruptive volume: 5 x 106 m3
- Thickness: ca. 30 cm
- Distribution: Mount Kodake, Aomori city, Aomori pref.
- Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)