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Ko-a Tephra

Abbr.: Ko-a

• Type locality: Mount Komagatake, Hokkaido
• Tephra
• Holocene (June 17th, 1929)

• Lithofacies: Pumice fall deposit (5 fall units), Pyroclastic flow deposit (more than 2 units), Pyroclastic surge deposit

• Mode of eruption: Plinian associated with pyroclastic flow deposit
• Eruptive volume (Pumice): ca. 0.38 km³
• Eruptive volume (Pyroclastic flow): ca. 0.14 km³
• Thickness (Erupted): 106 - 154 cm
• Thickness (Present): 70 - 120 cm

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Mount Komagatake, Hokkaido
• Distribution: Cape Dekima, Shikabe city, Kayabe county, Hokkaido

• Yoshimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.336-347 DOI
• Yoshimoto et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.81-92 DOI