"Kuju volcano is a complex of stratovolcanoes and lava domes lying NE of Aso caldera in north-central Kyushu. The Kuju volcano group consists of 16 andesitic lava domes, five andesitic stratovolcanoes, and one basaltic cone. Activity at the Kuju group dates back to about 150,000 years. Six major andesitic-to-dacitic tephra deposits, many associated with the growth of lava domes, have been recorded during the Holocene. Eruptive activity has migrated systematically eastward during the past 5000 years. The latest magmatic activity occurred about 1600 years ago, when Kuro-dake lava dome at the eastern end of the complex was formed. The first reports of historical eruptions were in the 17th and 18th centuries, when phreatic or hydrothermal activity occurred. Many hot springs and hydrothermal fields are located at the Kuju complex. A fumarole on Hosho lava dome was the site of a sulfur mine for at least 500 years. Two geothermal power plants are in operation at Kuju."  -Smithsonian Volcano Archive
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