The 22 km wide Rotorua caldera is the northwestern-most caldera of the Taupo Volcanic Zone; it is also the only single-event caldera. Rotorua [ˌ ɾ ɔ t ɔ ˈ ɾ ʉ a] (Māori: Te Rotorua-nui-a-Kahumatamomoe "The second great lake of Kahumatamomoe") is a city on the southern shores of Lake Rotorua from which the city takes its name, located in the Bay of Plenty Region of New Zealand's North Island. Mount Tarawera is a volcano on the North Island of New Zealand.Located 24 kilometres southeast of Rotorua, it consists of a series of rhyolitic lava domes that were fissured down the middle by an explosive basaltic eruption in 1886.This eruption was one of New Zealand's largest historical eruptions, and killed an estimated 120 people.
Rotorua is part of the Taupo Volcanic Zone, a geothermal field extending from White Island off the Bay of Plenty Coast to Mt Ruapehu far to the south. With a mean depth of only 10 metres it is considerably smaller than nearby Lake Tarawera in terms of volume of water. A caldera forming eruption occurred 220,000 years ago. Lake Rotorua is the second largest lake in the North Island of New Zealand by surface area, and covers 79.8 km 2.

Rotorua is the only single-event caldera in the Taupo volcanic zone and was formed about 220,000 years ago following eruption of the >340 cu km rhyolitic Mamaku Ignimbrite. Rotorua is the only single-event caldera in the Taupo volcanic zone and was formed about 220,000 years ago following eruption of the >340 cu km rhyolitic Mamaku Ignimbrite. Volcano: Rotorua: State : Alert Level: 0: Volcanic Activity: No volcanic unrest. It is a very distinctive area of mountains, lakes and a landscape that everywhere bears the trace of volcanic activity. It is located in the Bay of Plenty region. Most Likely Hazards: Volcanic environment hazards.

Although caldera collapse occurred in a single event, the process was complex and involved multiple collapse blocks. The city of Rotorua lies close to the active geothermal fields of Tikitere and Whakarewarewa. Volcanoes Near Rotorua Rotorua, Taupo and much of the central North Island lie in an area geologists call the Taupo Volcanic Zone. Rotorua is a volcanic wonderland with extraordinary landscapes and incredible geothermal attractions - each with their own unique features, rare flora and fauna, and all rich in Maori history and folklore. The city of Rotorua lies close to the active geothermal fields of Tikitere and Whakarewarewa. The major city of Rotorua lies at the south end of the lake that fills much of the caldera. The 22 km wide Rotorua caldera is the northwestern-most caldera of the Taupo Volcanic Zone; it is also the only single-event caldera. 38.08 S, 176.27 E summit elevation 757 m Caldera .