largest eruption occurred 26,500 years ago producing 300km³
of Ignimbrite (from pyroclastic flows) 500km³ of pumice and
ash and an unknown volume of material inside the caldera. There
was a large lake already present at the time but this eruption
is thought to have created the caldera now filled by Lake Taupo.
Lake Taupo covers about 600km².
last eruption in 181 AD - about 1800 years ago was unusually violent,
throwing out about 100km³ of material. A large and very energetic
pyroclastic flow finished the eruption which devastated an area
of about 20,000km², and filled all the major river valleys
of the Central North Island with pumice and ash. Rounded pumice
found on the beaches around the North Island come from this eruption.
The ash in the atmosphere was recorded at the time by both the
Romans and Chinese.