Wairarapa earthquake strikes New Zealand
- When
- 1855
- Where
- Cook Strait area; New Zealand; Wairarapa; Turakirae Head
- Episodes
- 4
The 1855 Wairarapa earthquake struck on 23 January, affecting the Cook Strait area. Estimated at magnitude 8.2, it was the most powerful recorded in New Zealand since 1840. Reports identify at least another four people (possibly as many as eight) as having died in the Wairarapa. Significant uplift occurred at Turakirae Head, and a bridge over the Hutt River was destroyed.
Episodes
- Magnitude Estimation
The earthquake is estimated at magnitude 8.2, the most powerful recorded in New Zealand since 1840.
- Geological Uplift
Uplift of 6.4 m at Turakirae Head formed a new raised beach, recording previous seismic activity.
- Earthquake Occurrence
The earthquake struck on 23 January at 9.17 p.m., affecting the Cook Strait area including Marlborough, Wellington, and Wairarapa.
- Casualties in Wairarapa
At least four people, possibly up to eight, died in the Wairarapa during the earthquake.
Background and detail
Background. The earthquake occurred on 23 January at approximately 9.17 p.m., impacting the Cook Strait region, including Marlborough, Wellington, and the Wairarapa. In Wellington, near the epicentre, shaking lasted at least 50 seconds. The event is estimated at magnitude 8.2, the most powerful recorded in New Zealand since systematic European colonisation began in 1840.
Geological Impact. The magnitude of 8.2 is unusually large for a strike-slip fault earthquake, with the largest known coseismic offset for such an event. Geomorphological evidence at Turakirae Head shows uplifted beach ridges recording previous earthquakes. The 1855 quake caused a 6.4 m uplift at Turakirae Head, forming a new raised beach.
Casualties and Damage. Reports identify at least four people, possibly as many as eight, as having died in the Wairarapa during the earthquake. A bridge over the Hutt River was wrecked. Severe uplift and landslides along the coastline likely extirpated local populations of Durvillaea antarctica southern bull kelp.
Sources
- 1855 Wairarapa earthquake Wikipedia, revision of 2026-08-11
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.