Taupo Volcano - John Seach

john

North Island, New Zealand

8.82 S 176.00 E
summit elevation 760 m
Caldera

Taupo Volcano is large and has many vents, most of which are now under Lake Taupo. The volcano makes up only the northern half of the lake and a small surrounding area.

Taupo Volcano photos by John Seach

Lake Taupo
Lake Taupo

Lake Taupo
Lake Taupo

Lake Taupo
Lake Taupo

Taupo volcano is not a mountain because the eruptions have been explosive and formed a caldera. Rhyolite accounts for about 98% of all erupted material at Taupo. Most of the rhyolite has been erupted explosively as pumice and ash.

Eruptions of basalt are rare at Taupo volcano. Some small basaltic cones about 500 m across and 200 m high have been formed. Examples are seen around the lake shoreline near Acacia Bay.

Hydrothermal vents in Lake Taupo
The inferred central vent of the 1.8 ka Taupo eruption is located near Horomatangi Reefs. The hydrothermal vents were discovered during a submersable survey in 1998.

1983 Earthquake swarm
In June and July 1983 an earthquake swarm was located under Horomatangi
Reefs. Focal depths were 5 km.

1964-65 Earthquake swarm
Between December 1964 and February 1965 a swarm of 1126 earthquakes began in the western edge of lake Taupo and migrated southeast. The earthquake magnitudes ranged from 2.7 to 4.5.

1.8 ka Taupo eruption
The most recent eruption at Taupo volcano generated 35-100 cubic km of material, and was one of the largest eruptions on earth in the past 5000 years. The Plinian eruption column probably would have been 50 km high, which collapsed to produce pyroclastic flows. Pumice fallout from the eruption extended for 220 km on land. Three eruptive centres have been identified with the eruption. They are aligned NE-SW fissure centred on Horomatangi Reefs.

26.5 ka Oruanui eruption
This eruption generated 430 cubic km of fall deposits and 300 cubic km of
pyroclastic material. The eruption was a caldera-forming event.

Taupo Volcano Eruptions

186 AD Taupo ( fifth largest caldera forming eruption in history).
26,500 years ago, (largest eruption)
150,000 years ago
330,000 years ago