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Aoba is a shield volcano with a large shallow crater, called Manaro, which contains one or more lakes.
Manaro contains gas vents that can be heard some distance away, hot springs, and solfataras.
Most of Aoba is made of tephra but a few thin basaltic lava flows have been noted.
In 1995, there was a strong gas discharge event with large amplitude tremor at Aoba.