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Kisakata Debris Avalanche Deposit

Invalid synonym: Kisakata Mudflow Deposit

• Stratovolcano
• Coherent formation
• Holocene (2.5 ka, 466 BC; 3.94 - 2.43 ka BP)

• Sedimentary facies: Caldera collapse deposit, Mudflow hills (more than 300)
• Lithofacies: Debris avalanche deposit
• Lithofacies: Pyroxene andesite blocks, Sands, Volcanic ash
• Paleocurrent: North, Northwest

• Source: East Chokai horseshoe-shaped caldera
• Thickness: 0 - 120 m
• Distribution: ca. 70 km²
• Distribution (Mudflow hills, Height): 5 - 40 m
• Distribution (Mudflow hills, Major axis): 10 - 400 m
• Volume: ca. 3.5 km³
• Upper limit: Unconformity (Younger Sand Dune Deposits, Kisakata Formation, Kotaki Formation, Younger Fan Deposit)
• Lower limit: Unconformity (Nishime Formation, Kotaki Mudflow Deposit, Yurihara Debris Deposits)

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

• Distribution: Hirasawa, Nikaho city, Akita pref.; Yokooka, Kisakata town, Nikaho city, Akita pref.; Konoura - Kamagatai - Toshi - Shirayuki river, Nikaho city, Akita pref.

• Hayashi and Yamamoto (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.87-95 DOI
• Nakano and Tsuchiya (1992) Geology of the Chokaisan and Fukura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)
• Ozawa et al. (1988) Geology of the Yashima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 87p. (in Japanese with English abstract 5p.)
• Ozawa et al. (1982) Geology of the Kisakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 73p. (in Japanese with English abstract 4p.)