Haroharo Caldera

A recent analysis is consistent with the south western structural boundary of the older single event caldera's being in the eastern portions of Lake Tarawera.

[2]: 2  It is therefore not regarded now as a caldera in its own right formed by one single event and there have been many attempts to rationalise the literature from a descriptor used since at least 1962.

There has been a large amount of dome infilling that refer to the Haroharo name, but the term Ōkataina complex volcano is felt by many to be a better name than the Haroharo volcano to understand the processes that have happened in this portion of the Taupō Volcanic Zone.

[4] Within the Haroharo vent line there was a VEI-5 volcanic eruption about 6060 BCE producing about 17 km3 (4.1 cu mi) of eruptive material and one about 2000 years later that produced 13 km3 (3.1 cu mi) of material.

[5] With its linear parallel young vent alignment to those of the similarly young in geological terms, Tarawera volcano, and related magma sources, this means it is now usually regarded as a subsidiary volcanic part of the Ōkataina Caldera which in the last 21,000 years has contributed a total magma eruptive volume greater than about 80 km3 (19 cu mi).