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Towada-Hachimantai NP, Aomori
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Akakuradake grew into 2 successive volcanic cones, each followed by collapse. Their northeast-opening horseshoe scars span 1.6 km and 500 m; debris from the older collapse reached Tashirodaira.
Akakura-numa is more than a pond: this 40-m-wide crater, 200 m east of the summit, formed after the younger collapse scar and later vented lava and ash in Akakuradake’s final mapped eruptive phase.
Geologists found about 1.5 cm of Towada’s AD 915 Kemanai pyroclastic-flow deposit on Akakuradake’s summit, some 25 km from its source—a thin volcanic calling card from a neighboring mountain.
Hakkoda has 2 peaks called Akakuradake: this northern one is 1,548 m; its southern namesake is 1,298 m. That other mountain’s ancient collapse created Tsuta’s rocky landscape and 6 ponds.
