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Hk-4a Tephra Kudo et al., 2000, 2003a

Abbr.: Hk-4a

• Type locality: Mount Kodake, Aomori city, Aomori prefecture
• Holocene (4.2 cal ka BP, ¹⁴C)

• Sedimentary facies: Terrestrial
• Lithofacies: Volcanic ash

• Mode of eruption: Vulcanian
• Source: Summit crater of Mount Odake (Kita-Hakkoda volcanoes)
• Eruptive volume: 7 x 10⁶ m³
• Thickness: 17 cm

• Distribution: Mount Hakkoda, 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.)