Great eruptions in recording history took place in 1471-1476 (Bunmei era),
1779-1782 (An-ei era) and 1914 (Taisho era). A huge amount of lava flows
and pyrocrastic materials were erupted from parasitic craters at both sides
of the summit. Lava flows in the 1914 eruption piled up a channel 400m wide
and connected the volcano with Osumi Peninsula. Present summit activity
began in 1955. More than 7,300 explosive eruptions have been recorded in
the past 45 years.