The Ikeda volcano produced about 20,000 years before present the Iwamoto tephra layer found right around the region of Kagoshima Bay but not further.

[2] The caldera-forming eruptions began 6400 years ago involving by the time they had finished about 5 km3 (1.2 cu mi) of magma[3] and produced local pyroclastic deposits and the Ikezaki tephra.

[2] The present caldera was formed 4800 years ago[4] when the Ikeda ignimbrite erupted that reached the eastern and western sides and southern tip of the Satsuma Peninsula.

[5] This was followed by later eruptions including the Ikedako tephra and those from a fissure vent line southeast of the caldera that produced the pumiceous Yamagawa base surge.

The National Catalogue of the Active Volcanoes of Japan (JMA, 2013) includes features of the Ibusuki volcanic field as part of the Ata post-caldera system.