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Adatara
"The broad forested massif of Adatara volcano is located east of Bandai volcano, about 15 km SW of Fukushima city. Adatara consists of a group of dominantly andesitic stratovolcanoes and lava domes that rise above Tertiary rocks on the south and abut Azuma volcano on the north. Adatara was constructed in three main stages that began about 550,000, 350,000, and 200,000 years ago. The high point of the complex is 1718-m-high Minowa-yama, a dome-shaped stratovolcano north of Tetsu-zan, the currently active stratovolcano. Numanotaira, the active summit crater, is surrounded by hot springs and fumaroles and is breached by the Io-gawa river ("Sulfur River") on the west. Seventy-two workers of a sulfur mine in the summit crater were killed during an eruption in 1900. Historical eruptions have been restricted to the 1.2-km-wide, 350-m-deep Numonotaira crater."  -Smithsonian Volcano Archive
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