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Tofua
Tofua is a volcanic island in Tonga. Located in the Haʻapai island group, it is a steep-sided composite cone with a summit caldera. It is part of the highly active Kermadec-Tonga subduction zone and its associated volcanic arc, which extends from New Zealand north-northeast to Fiji, and is formed by the subduction of the Pacific Plate under the Indo-Australian Plate. It lies about above a very active seismic zone.Ewart, A.; Bryan, W.B.; and Gill, J.B. "Mineralogy and Geochemistry of the Younger Volcanic Islands of Tonga, S.W. Pacific." ''Journal of Petrology.'' 14:3 (1973). It is connected to the nearby island of Kao by a submarine ridge. The island is a national park. Geography and geology The island is oval, measuring approximately 80 square kilometers. Its sides rise steeply to the rim of the caldera, which is partially filled by a volcanic crater lake with a depth of . The caldera was formed by a major eruption around 1,000 years BP, which left deposits up to thick on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tofua
Tofua is a volcanic island in Tonga. Located in the Haʻapai island group, it is a steep-sided composite cone with a summit caldera. It is part of the highly active Kermadec-Tonga subduction zone and its associated volcanic arc, which extends from New Zealand north-northeast to Fiji, and is formed by the subduction of the Pacific Plate under the Indo-Australian Plate. It lies about above a very active seismic zone.Ewart, A.; Bryan, W.B.; and Gill, J.B. "Mineralogy and Geochemistry of the Younger Volcanic Islands of Tonga, S.W. Pacific." ''Journal of Petrology.'' 14:3 (1973). It is connected to the nearby island of Kao by a submarine ridge. The island is a national park. Geography and geology The island is oval, measuring approximately 80 square kilometers. Its sides rise steeply to the rim of the caldera, which is partially filled by a volcanic crater lake with a depth of . The caldera was formed by a major eruption around 1,000 years BP, which left deposits up to thick on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mutiny On The Bounty
The mutiny on the Royal Navy vessel occurred in the South Pacific Ocean on 28 April 1789. Disaffected crewmen, led by acting-Lieutenant Fletcher Christian, seized control of the ship from their captain, Lieutenant William Bligh, and set him and eighteen loyalists adrift in the ship's open launch. The mutineers variously settled on Tahiti or on Pitcairn Island. Bligh navigated more than in the launch to reach safety, and began the process of bringing the mutineers to justice. ''Bounty'' had left England in 1787 on a mission to collect and transport breadfruit plants from Tahiti to the West Indies. A five-month layover in Tahiti, during which many of the men lived ashore and formed relationships with native Polynesians, led those men to be less amenable to military discipline. Relations between Bligh and his crew deteriorated after he allegedly began handing out increasingly harsh punishments, criticism, and abuse, Christian being a particular target. After three weeks ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kao (island)
Kao is an island and stratovolcano in the Haʻapai island group of Tonga. It lies about north of Tofua island and reaches above sea level, the highest point in Tonga. The date of its last eruption is unknown. Although Kao does not display fresh-looking lava flows, it is likely very recent in origin due to the absence of deep gullies or high sea cliffs. The slopes of the island rise at angles exceeding 35 degrees to the summit, which has a series of small volcanic craters. The last reported eruption was on July 10, 1847. The best access to Kao is by small boat on the south coast of the island, although heavy swell can make this treacherous and a skilled boat coxswain is required. There are no permanent paths to the summit. Small areas on the lower slopes are cultivated by kava growers. The island is densely jungled on its lower flanks, interspersed with thick chest-height ferns that are virtually impassable to all but the most determined trekkers armed with machetes and a good ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Bligh
Vice-Admiral William Bligh (9 September 1754 – 7 December 1817) was an officer of the Royal Navy and a colonial administrator. The mutiny on the HMS ''Bounty'' occurred in 1789 when the ship was under his command; after being set adrift in ''Bounty''s launch by the mutineers, Bligh and his loyal men all reached Timor alive, after a journey of . Bligh's logbooks documenting the mutiny were inscribed on the UNESCO Australian Memory of the World register on 26 February 2021. Seventeen years after the ''Bounty'' mutiny, on 13 August 1806, he was appointed Governor of New South Wales in Australia, with orders to clean up the corrupt rum trade of the New South Wales Corps. His actions directed against the trade resulted in the so-called Rum Rebellion, during which Bligh was placed under arrest on 26 January 1808 by the New South Wales Corps and deposed from his command, an act which the British Foreign Office later declared to be illegal. He died in London on 7 December 1817. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In Tonga ...
This is a list of active and extinct volcanoes in Tonga. References * See especiallFigure 1 * D. Stanley; South Pacific handbook * Government of Tonga, official 1962 land survey {{reflist Tonga Volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haʻapai
Haʻapai is a group of islands, islets, reefs, and shoals in the central part of Tonga. It has a combined land area of . The Tongatapu island group lies to its south, and the Vavaʻu group lies to its north. Seventeen of the Haʻapai islands are inhabited. Their combined population is 5,419. The highest point in the Ha‘apai group, and in all of Tonga, is on Kao, which rises almost above sea level. The administrative capital village of Haʻapai District is Pangai, which is located on Lifuka. Geography Haʻapai comprises 51 islands that lie directly west of the Tonga Trench. They constitute a chain of both volcanic and coral islands, including Kao, the highest point in the kingdom, which stands high. Farther to the east are the coral islands, which are inhabited. The Haʻapai archipelago lies north of Tongatapu and south of Vavaʻu. Seventeen of the islands are inhabited, including the main islands of Lifuka and Foa. The two main villages in the archipelago are Pangai on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Crater Lake
A volcanic crater lake is a lake in a crater that was formed by explosive activity or a collapse during a volcanic eruption. Formation Lakes in calderas fill large craters formed by the collapse of a volcano during an eruption. Lakes in maars fill medium-sized craters where an eruption deposited debris around a vent. Crater lakes form as the created depression, within the crater rim, is filled by water. The water may come from precipitation, groundwater circulation (often hydrothermal fluids in the case of volcanic craters) or melted ice. Its level rises until an equilibrium is reached between the rates of incoming and outgoing water. Sources of water loss singly or together may include evaporation, subsurface seepage, and, in places, surface leakage or overflow when the lake level reaches the lowest point on its rim. At such a saddle location, the upper portion of the lake is contained only by its adjacent natural volcanic dam; continued leakage through or surface outflow ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timor
Timor is an island at the southern end of Maritime Southeast Asia, in the north of the Timor Sea. The island is East Timor–Indonesia border, divided between the sovereign states of East Timor on the eastern part and Indonesia on the western part. The Indonesian part, also known as West Timor, constitutes part of the Provinces of Indonesia, province of East Nusa Tenggara. Within West Timor lies an exclave of East Timor called Oecusse District. The island covers an area of . The name is a variant of ''timur'', Malay language, Malay for "east"; it is so called because it lies at the eastern end of the Lesser Sunda Islands. Mainland Australia is less than 500 km away, separated by the Timor Sea. Language, ethnic groups and religion Anthropologists identify eleven distinct Ethnolinguistic group, ethno-linguistic groups in Timor. The largest are the Atoni of western Timor and the Tetum of central and eastern Timor. Most indigenous Timorese languages belong to the Timorâ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kupang
Kupang ( id, Kota Kupang, ), formerly known as Koepang, is the capital of the Indonesian province of East Nusa Tenggara. At the 2020 C ensus, it had a population of 442,758; the official estimate as at mid 2021 was 455,850. It is the largest city and port on the island of Timor, and is a part of the Timor Leste-Indonesia-Australia Growth Triangle free trade zone. Geographically, Kupang is the southernmost city in Indonesia. History Early history and Portuguese domination Kupang was an important port and trading post during the Portuguese and Dutch colonial eras. There are still ruins and remnants of the colonial presence in the city. Representatives of the Dutch East India Company (VOC) first encountered Kupang in 1613 after having conquered the Portuguese fort on the island of Solor. At this time the area of the city was governed by a Raja of the Helong tribe, who claimed descent from the island of Ceram in the Maluku archipelago. Kupang occupied an ideal strategic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dutch East India Company
The United East India Company ( nl, Verenigde Oostindische Compagnie, the VOC) was a chartered company established on the 20th March 1602 by the States General of the Netherlands amalgamating existing companies into the first joint-stock company in the world, granting it a 21-year monopoly to carry out trade activities in Asia. Shares in the company could be bought by any resident of the United Provinces and then subsequently bought and sold in open-air secondary markets (one of which became the Amsterdam Stock Exchange). It is sometimes considered to have been the first multinational corporation. It was a powerful company, possessing quasi-governmental powers, including the ability to wage war, imprison and execute convicts, negotiate treaties, strike its own coins, and establish colonies. They are also known for their international slave trade. Statistically, the VOC eclipsed all of its rivals in the Asia trade. Between 1602 and 1796 the VOC sent almost a million Eur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scoria
Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock that was ejected from a volcano as a molten blob and cooled in the air to form discrete grains or clasts.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. It is typically dark in color (generally dark brown, black or purplish-red), and basaltic or andesitic in composition. Scoria is relatively low in density as a result of its numerous macroscopic ellipsoidal vesicles, but in contrast to pumice, all scoria has a specific gravity greater than 1, and sinks in water. The holes or vesicles form when gases that were dissolved in the magma come out of solution as it erupts, creating bubbles in the molten rock, some of which are frozen in place as the rock cools and solidifies. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta (lapilli, blocks and bombs), for inst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Backstaff
The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the Sun or Moon. When observing the Sun, users kept the Sun to their back (hence the name) and observed the shadow cast by the upper vane on a horizon vane. It was invented by the English navigator John Davis, who described it in his book ''Seaman's Secrets'' in 1594. Types of backstaffs Backstaff is the name given to any instrument that measures the altitude of the sun by the projection of a shadow. It appears that the idea for measuring the sun's altitude using back observations originated with Thomas Harriot. Many types of instruments evolved from the cross-staff that can be classified as backstaves. Only the Davis quadrant remains dominant in the history of navigation instruments. Indeed, the Davis quadrant is essentially synonymous with backstaff. However, Davis was neither the first nor the last to design such an instrument and others are considered here ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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