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Rotomā Caldera
The relatively small Rotomā Caldera (also known as Rotomā Embayment, Rotomā volcanic complex, and spelled Rotoma) is in the Taupō Volcanic Zone in the North Island of New Zealand. Geography The Rotomā Caldera is located halfway between the city of Rotorua and town of Whakatāne, with its in filling Lake Rotomā being the easternmost in the chain of three volcanic lakes to the northeast of Lake Rotorua. The other two are Lake Rotoiti and Lake Rotoehu. Geology The Rotomā Caldera is immediately to the northeast of the area previously called the Haroharo volcanic complex, and now known as the Haroharo vent alignment.Okataina Volcanic Centre Geology " ''GNS science''. Retrieved 11 June 2022. This is now regarded as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Rotomā
Lake Rotomā (also spelled Rotoma) is the fourth largest lake of the 11 lakes in the Rotorua Lakes district in the Bay of Plenty Region of New Zealand's North Island. Lake Rotomā is the easternmost in the chain of three lakes to the northeast of Lake Rotorua The other two are Lake Rotoiti and Lake Rotoehu. Rotomā is located halfway between the city of Rotorua and town of Whakatāne. Lake Rotomā has a high water quality with visibility up to around 13 metres deep. The lake has a maximum depth of 83 metres in the northern part and 73.5 metres in the southern part. Geography Lake Rotomā was formed within the Rotomā Caldera when lava flows from a large crater explosion blocked its outlet 9,500 years ago. The hills fringing the south and east of the lake are made up of rhyolite from eruptions from its own caldera, the Haroharo and Tarawera vent alignments, all in the Ōkataina Volcanic Centre. Inflow is from rainfall, three small streams and several springs around the l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Rotoiti (Bay Of Plenty)
Lake Rotoiti is a lake in the Bay of Plenty region of New Zealand. It is the northwesternmost in a chain of lakes formed within the Ōkataina Caldera. The lake is close to the northern shore of its more famous neighbour, Lake Rotorua, and is connected to it via the Ohau Channel. It drains to the Kaituna River, which flows into the Bay of Plenty near Maketu. The full name of the lake is Te Rotoiti-kite-a-Īhenga, which in the Māori language means "The Small Lake Discovered by Īhenga", the Māori people, Māori explorer also credited with discovering Lake Rotorua. Legend says that the lake was named as such because when Ihenga first saw it, he could only see a small part of it and thought the lake was a lot smaller. Since the 1960s, the quality of lake water has been negatively affected by inflows of nitrogen rich water from Lake Rotorua, agricultural run-off from surrounding farms and seepage from domestic septic tanks. The effects of this included an almost permanent algal b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calderas Of New Zealand
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the structural integrity of such a chamber, greatly diminishing its capacity to support its own roof and any substrate or rock resting above. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface (from one to dozens of kilometers in diameter). Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur over the course of a century, the formation of a caldera is a rare event, occurring only a few times within a given window of 100 years. Only eight caldera-forming collapses are known to have occurred between ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whakatāne Graben
The Whakatāne Graben (also Whakatane Graben) is a predominantly normal faulting tectonic feature of the northeastern aspect of the young, modern Taupō Rift in New Zealand. At the coast it is widening by about /year. This very geologically active graben was the site of the 1987 Edgecumbe earthquake, which caused up to of land subsidence. The discontinuity in the Taupō Volcanic Zone's faults imposed by the highly active Ōkataina Volcanic Centre, geography and geology mean the graben is usually regarded as including the actively expanding and lowering region onshore extending towards the coast. Some scientists have limited the Whakatāne Graben to only the offshore continuation of the Taupō Rift. Geography The graben extends on shore from the west of the town of Kawerau to the coast at Matatā in the north and Whakatāne in the south. It is drained by the Tarawera River to the north and the Rangitaiki River to the south. The volcano of Putauaki (Mount Edgecumbe) is towar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manawahe Fault
The Manawahe Fault line is a seismically active area in the Bay of Plenty Region of the central North Island of New Zealand with the potential to be involved with other faults in an event. Geology North of Lake Rotomā, volcanic ignimbrite sheets from multiple eruptions of the Ōkataina Caldera extend towards the Whakatane Graben, with the volcanic region being separated from the tectonic Whakatane portion of the Taupō Rift by the Manawahe Fault. The fault continues to the east and coast in the Matata Fault line. The Manawahe Fault consists of a series of closely-spaced, mainly SSE-dipping fault traces, which are parallel to the North Rotoma Fault at the edge of the north eastern edge of the Rotoma Caldera. The traces are presumed to merge within of the surface. The Manawahe Fault ruptured immediately prior to the 5500 years ago Whakatane eruption of the Ōkataina Caldera and also ruptured several times, associated with the Rotoma Caldera eruptive sequence, and immediatel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Te Ara - Encyclopedia Of New Zealand
''Te Ara: The Encyclopedia of New Zealand'' is an online encyclopedia established in 2001 by the New Zealand Government's Ministry for Culture and Heritage. The web-based content was developed in stages over the next several years; the first sections were published in 2005, and the last in 2014 marking its completion. ''Te Ara'' means "the pathway" in the Māori language, and contains over three million words in articles from over 450 authors. Over 30,000 images and video clips are included from thousands of contributors. History New Zealand's first recognisable encyclopedia was ''The Cyclopedia of New Zealand'', a commercial venture compiled and published between 1897 and 1908 in which businesses or people usually paid to be covered. In 1966 the New Zealand Government published ''An Encyclopaedia of New Zealand'', its first official encyclopedia, in three volumes. Although now superseded by ''Te Ara'', its historical importance led to its inclusion as a separate digital reso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ōkataina Caldera
Ōkataina Caldera (Ōkataina Volcanic Centre, also spelled Okataina) is a volcano, volcanic caldera and its associated volcanoes located in Taupō Volcanic Zone of New Zealand's North Island. It has several actual or postulated sub calderas. The Ōkataina Caldera is just east of the smaller separate Rotorua Caldera and southwest of the much smaller Rotomā Caldera, Rotomā Embayment which is usually regarded as an associated volcano. It shows high rates of explosive rhyolite, rhyolitic volcanism although its last eruption was basaltic. The postulated Haroharo Caldera contained within it has sometimes been described in almost interchangeable terms with the Ōkataina Caldera or volcanic complex or centre and by other authors as a separate complex defined by gravitational and magnetic features..Possibly started from with the author presuming that certain ignimbrites came from this source. The term Haroharo Caldera was increasingly used in academic papers in the 1970's and 1980's but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haroharo Caldera
The Haroharo Caldera (Haroharo volcanic complex) is a postulated volcanic feature in Taupō Volcanic Zone of the North Island, New Zealand within the larger and older Ōkataina Caldera. Since 2010 further studies have tended to use the terms Haroharo vent alignment, Utu Caldera, Matahina Caldera, Rotoiti Caldera and a postulated Kawerau Caldera to the features assigned to it. However the name is used in the peer reviewed literature to summarise and group these features based on gravitational and magnetic features. Geography In the north the Haroharo Caldera has been mapped as extending from the eastern half of Lake Rotoiti to the western border of Lake Rotomā. Its southern extent was defined by the Tarawera volcano. A recent analysis is consistent with the south western structural boundary of the older single event caldera's being in the eastern portions of Lake Tarawera. Both the Ōkāreka Embayment and the Tarawera Volcanic Complex are adjacent, so many, especially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Rotoehu
Lake Rotoehu is the smallest in a chain of three lakes to the northeast of Lake Rotorua in New Zealand's North Island. It is located between the city of Rotorua and town of Whakatāne. The southern end of the lake occupies part of the Okataina caldera. It is fed (underground seepage) by Lake Rotomā to the east, and flows westward joining Lake Rotoiti. The lake is one of the least visited, but offers great Kayaking and fishing (rainbow trout). It has two access points, Otautu Bay and Kennedy Bay and is well located centrally to many other places e.g. the ocean, mountain biking, hiking etc. It has very good wildlife and birdlife with several rarely seen birds. In particular the endangered kōkako is located close by. The New Zealand Ministry for Culture and Heritage The Ministry for Culture and Heritage (MCH; ) is the department of the New Zealand Government responsible for supporting the Creative New Zealand, arts, Culture of New Zealand, culture, New Zealand Historic Plac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Rotorua
Lake Rotorua () is the second largest lake in the North Island of New Zealand by surface area, and covers 79.8 km2. With a mean depth of only 10 metres it is considerably smaller than nearby Lake Tarawera in terms of volume of water. It is located within the Rotorua Caldera in the Bay of Plenty Region. Geography Lake Rotorua is fed with water from a number of rivers and streams; some such as the Utuhina flow with a water temperature warmer than the lake due to the thermal activity in the Rotorua area. Conversely streams on the northern shore such as the Hamurana Spring and the Awahou stream flow crystal clear water that has a constant temperature of 10 degrees Celsius. Other notable tributaries include the Ngongotahā stream, famous for trout fishing. Lake Rotorua flows directly into Lake Rotoiti via the Ohau Channel at the north eastern corner of the lake. The urban development of Rotorua extends along the south portion of the lake shore. Geology The lake was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Island
The North Island ( , 'the fish of Māui', historically New Ulster) is one of the two main islands of New Zealand, islands of New Zealand, separated from the larger but less populous South Island by Cook Strait. With an area of , it is the List of islands by area, world's 14th-largest island, constituting 43% of New Zealand's land area. It has a population of which is % of New Zealand's residents, making it the most populous island in Polynesia and the List of islands by population, 28th-most-populous island in the world. Twelve main urban areas (half of them officially cities) are in the North Island. From north to south, they are Whangārei, Auckland, Hamilton, New Zealand, Hamilton, Tauranga, Rotorua, Gisborne, New Zealand, Gisborne, New Plymouth, Napier, New Zealand, Napier, Hastings, New Zealand, Hastings, Whanganui, Palmerston North, and New Zealand's capital city Wellington, which is located at the south-west tip of the island. Naming and usage The island has been known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
