"Yotei is a symmetrical andesitic-to-dacitic stratovolcano with a Fuji-like profile the forms a prominent landmark NW of Toya caldera. Its 1898-m-high summit, rising about 1500 m above its base, is truncated by a 700-m-wide crater that is cut on its NW rim by overlapping smaller craters. Deep radial gullies cut the flanks of Yotei. The latest eruption from the main Yotei edifice took place about 5000-6000 years ago. Hangetsu-ko (Half Moon Lake), a tuff cone on the lower NW flank of Yotei, was estimated from stratigraphic evidence to have erupted about 3000 years ago."  -Smithsonian Volcano Archive
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