AD 232

Taupō eruption

The Taupō eruption (eruption Y)

A tree killed at Pureora preserved enough rings for 25 high-precision radiocarbon measurements — and moved the eruption half a century later in history.

The date moved

The year 181 is obsolete. The best radiocarbon date is 232 ± 10 CE at 95% probability, and a 2023 Antarctic cryptotephra study independently produced 230 ± 19 CE from chemically matched Taupō glass.

The old 181 and 186 dates came from incorrectly associated ice-core or historical phenomena and are no longer viable — which means red skies reported at Rome and in China around 186 cannot be effects of this eruption.

Five phases, then the sixth

In the austral late summer or early autumn of about 232 CE, Taupō volcano beneath Lake Taupō began a complex rhyolitic eruption that ran for several days to several weeks.

Five contrasting pyroclastic-fall units were laid down before the climactic sixth phase emplaced the Taupō ignimbrite across central North Island.

Twenty thousand square kilometres in fifteen minutes

Collapse of an eruption column roughly 35 to 40 kilometres high generated a hot, extremely fast pyroclastic density current — about 600 to 900 km/h — that crossed ridges and covered around 20,000 km² in approximately 10 to 15 minutes.

Caldera collapse during the eruption formed a new basin inside the older Ōruanui caldera beneath the lake. The ignimbrite filled valleys and depressions, buried drainage networks and blocked the Waikato River outlet from the lake basin.

Sources

Researched 23 Aug 2026 6 sources not yet audited Date corrected

How this was checked

Researched from the web into a fact sheet and rewritten from that sheet. This article has not yet had an independent model audit. How the pipeline works →

Date corrected. The research places this at ~0232.

What the sources leave uncertain

The eruption cannot be assigned to a single calendar year with absolute certainty. The preferred estimate is 232 ± 10 CE, probably in late March or early April.
A 2023 Antarctic cryptotephra study independently produced 230 ± 19 CE, reinforcing the radiocarbon result.
A 2023 paleomagnetic study found a possible date near 310 CE, but described its dating constraint as less direct than the established wiggle-match chronology.
The formerly proposed 181 or 186 CE dates came from incorrectly associated ice-core or historical phenomena and are no longer viable.