A geyser is a spring characterized by an intermittent discharge of water ejected turbulently and accompanied by steam. As a fairly rare phenomenon, the formation of geysers is due to particular hydrogeological conditions that exist only in a few places on Earth. Generally all geyser field sites are located near active volcanic areas, and the geyser effect is due to the proximity of magma. Generally, surface water works its way down to an average depth of around 2,000 metres (6,600 ft) where it contacts hot rocks. The resultant boiling of the pressurized water results in the geyser effect of hot water and steam spraying out of the geyser's surface vent.
The geothermal areas of Yellowstone include several geyser basins in Yellowstone National Park as well as other geothermal features such as hot springs, mud pots, and fumaroles. The number of thermal features in Yellowstone is estimated at 10,000. A study that was completed in 2011 found that a total of 1,283 geysers have erupted in Yellowstone, 465 of which are active during an average year. These are distributed among nine geyser basins, with a few geysers found in smaller thermal areas throughout the Park. The number of geysers in each geyser basin are as follows: Upper Geyser Basin (410), Midway Geyser Basin (59), Lower Geyser Basin (283), Norris Geyser Basin (193), West Thumb Geyser Basin (84), Gibbon Geyser Basin (24), Lone Star Geyser Basin (21), Shoshone Geyser Basin (107), Heart Lake Geyser Basin (69), other areas (33). Although famous large geysers like Old Faithful are part of the total, most of Yellowstone's geysers are small, erupting to only a foot or two. The hydrothermal system that supplies the geysers with hot water sits within an ancient active caldera. Many of the thermal features in Yellowstone build up sinter, geyserite, or travertine deposits around and within them.
The Pink and White Terraces, were natural wonders of New Zealand. They were reportedly the largest silica sinter deposits on earth. Until recently, they were lost and thought destroyed in the 1886 eruption of Mount Tarawera, while new hydrothermal features formed to the south-west i.e. Waimangu Volcanic Rift Valley.
Mount Tarawera is a volcano on the North Island of New Zealand within the older but volcanically productive Ōkataina Caldera. 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. The fissures run for about 17 kilometres northeast-southwest.
Mount Tongariro is a compound volcano in the Taupō Volcanic Zone of the North Island of New Zealand. It is located 20 kilometres (12 mi) to the southwest of Lake Taupō, and is the northernmost of the three active volcanoes that dominate the landscape of the central North Island.
The Waimangu Geyser, located near Rotorua in New Zealand, was for a time the most powerful geyser in the world.
Orakei Korako is a highly active geothermal area most notable for its series of fault-stepped sinter terraces, located in a valley north of Taupō on the banks of the Waikato River in the Taupō Volcanic Zone, New Zealand. It is also known as "The Hidden Valley".
Te Arawa is a confederation of Māori iwi and hapu of New Zealand who trace their ancestry to the Arawa migration canoe (waka). The tribes are based in the Rotorua and Bay of Plenty areas and have a population of around 40,000.
The Waimangu Volcanic Rift Valley is the hydrothermal system created on 10 June 1886 by the volcanic eruption of Mount Tarawera, on the North Island of New Zealand. It encompasses Lake Rotomahana, the site of the Pink and White Terraces, as well as the location of the Waimangu Geyser, which was active from 1900 to 1904. The area has been increasingly accessible as a tourist attraction and contains Frying Pan Lake, which is the largest hot spring in the world, and the steaming and usually pale blue Inferno Crater Lake, the largest geyser-like feature in the world although the geyser itself cannot be seen since it plays at the bottom of the lake.
Tūhourangi is a Māori iwi of New Zealand with a rohe centered on Lake Tarawera, Lake Rotomahana, Lake Okaro, Lake Okareka, Lake Rotokākahi, Lake Tikitapu and Lake Rotorua.
Pōhutu Geyser is a geyser in the Whakarewarewa Thermal Valley, Rotorua, in the North Island of New Zealand. The geyser is the largest in the southern hemisphere and among the most active in the area, erupting up to twenty times per day at heights of up to 30 m (98 ft). The name Pōhatu is derived from te reo Māori, although it has an unclear etymology – being translated as either 'big splash', 'explosion' or 'constant splashing'.
Tikitere, also known as "Hell's Gate", is a suburb in Rotorua's most active geothermal area on State Highway 30, between Lake Rotorua and Lake Rotoiti in the Bay of Plenty, New Zealand. It includes many geothermal features such as steaming lakes, mudpools, fumaroles, a mud volcano and the Kakahi Falls, the largest hot waterfall in the southern hemisphere.
The Bay of Plenty is a region of New Zealand, situated around a bight of the same name in the northern coast of the North Island. The bight stretches 260 km from the Coromandel Peninsula in the west to Cape Runaway in the east. The Bay of Plenty Region, governed by the Bay of Plenty Regional Council, incorporates several large islands in the bay, in addition to the mainland area. Called Te Moana-a-Toi in the Māori language after Toi, an early ancestor, the name 'Bay of Plenty' was bestowed by James Cook in 1769 when he noticed the abundant food supplies at several Māori villages there, in stark contrast to observations he had made earlier in Poverty Bay.
Margaret Pattison Staples-Browne, often known as Maggie Papakura or Mākereti Papakura, was a New Zealand guide, entertainer and ethnographer. Of Pākehā and Māori descent, she was of Te Arawa and Tūhourangi iwi.
Alfred Patchett Warbrick was a New Zealand boatbuilder, rugby player and tourist guide. Of Māori descent, he identified with the Ngāti Rangitihi and Te Arawa iwi.
Te Keepa Te Rangi-pūawhe was a Māori tribal leader, soldier and entrepreneur of New Zealand. He identified with the Tūhourangi iwi.
Mita Taupopoki was a notable Māori tribal leader of New Zealand. He identified with Ngāti Wāhiao, a hapū (subtribe) of the Tūhourangi iwi of Te Arawa.
Sophia Hinerangi was a New Zealand tourist guide and temperance leader. Of Māori descent, she identified with the Ngāti Ruanui iwi.
In 1886, a violent eruption occurred at Mount Tarawera, near the city of Rotorua on New Zealand's North Island. At an estimated Volcanic Explosivity Index of 5, the eruption is the largest and deadliest in New Zealand during the past 500 years, which includes the entirety of European history in New Zealand. The eruption began in the early hours of 10 June 1886 and lasted for approximately 6 hours, causing a 10-kilometre-high (6.2 mi) ash column, earthquakes, lightning, and explosions to be heard as far away as Blenheim in the South Island — more than 500 kilometers away. A 17-kilometre-long (11 mi) rift formed across the mountain and surrounding area during the eruption, starting from the Wahanga peak at the mountain's northern end and extending in a southwesterly direction, through Lake Rotomahana and forming the Waimangu Volcanic Rift Valley.
Whakarewarewa
