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Pago (American Samoa)
Pago is a shield volcano in the center of Tutuila Island, the largest island of American Samoa in the South Pacific Ocean. The volcano was formed by subaerial eruptions between 1.54 and 1.28 million years ago. It has been estimated that the volcano was as high as above sea level. Activity on Pago Volcano ended with emplacement of trachyte bodies with ages of 1.03 ± 0.01 Ma. The Pago Volcano caldera was formed 1.27+-0.02 million years ago. The caldera's dimensions are estimated at in length and in width. The southeast part of the caldera makes up Pago Pago Harbor, one of the world's largest natural harbors. The northwest rim, Maugaloa Ridge, creates the southern border of the National Park of American Samoa The National Park of American Samoa is a national park in the United States territory of American Samoa, distributed across three islands: Tutuila, Ofu, and Ta‘ū. The park preserves and protects coral reefs, tropical rainforests, fruit bats, ..... References Vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pagopago Amerika Sāmoa
Pago Pago ( ; Samoan language, Samoan: )Harris, Ann G. and Esther Tuttle (2004). ''Geology of National Parks''. Kendall Hunt. Page 604. . is the territorial Capital city, capital of American Samoa. It is in Maoputasi County, American Samoa, Maoputasi County on Tutuila, which is American Samoa's main island. Pago Pago is home to one of the deepest natural deepwater harbors in the South Pacific Ocean, sheltered from wind and rough seas, and strategically located.United States Central Intelligence Agency (2016). ''The World Factbook 2016–17''. Government Printing Office. Page 19. .Grabowski, John F. (1992). ''U.S. Territories and Possessions (State Report Series)''. Chelsea House Pub. .Kristen, Katherine (1999). ''Pacific Islands (Portrait of America)''. San Val. . The harbor is also one of the best protected in the South Pacific,Leonard, Barry (2009). ''Minimum Wage in American Samoa 2007: Economic Report''. Diane Publishing. . which gives American Samoa a natural advantage becaus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shield Volcano
A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava erupted from a stratovolcano. Repeated eruptions result in the steady accumulation of broad sheets of lava, building up the shield volcano's distinctive form. Shield volcanoes are found wherever fluid low-silica lava reaches the surface of a rocky planet. However, they are most characteristic of ocean island volcanism associated with hot spots or with continental rift volcanism. They include the largest volcanoes on earth, such as Tamu Massif and Mauna Loa. Giant shield volcanoes are found on other planets of the Solar System, including Olympus Mons on Mars and Sapas Mons on Venus. Etymology The term 'shield volcano' is taken from the German term ''Schildvulkan'', coined by the Austrian geologist Eduard Suess in 1888 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tutuila Island
Tutuila is the main island of American Samoa (and its largest), and is part of the archipelago of Samoan Islands. It is the third largest island in the Samoan Islands chain of the Central Pacific. It is located roughly northeast of Brisbane, Australia and lies over to the northeast of Fiji. It contains a large, natural harbor, Pago Pago Harbor, where Pago Pago, the capital of American Samoa, is situated. Pago Pago International Airport is also located on Tutuila. The island’s land expanse is about 68% of the total land area of American Samoa. With 56,000 inhabitants, it is also home to 95% of the population of American Samoa. The island has six terrestrial and three marine ecosystems. Tutuila has mountainous regions, the highest point of which is ). The island is attractive to tourists because of its beaches, coral reefs, and World War II relics, as well as its suitability for sporting activities such as scuba diving, snorkeling, and hiking. Etymology It is said that the nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Samoa
American Samoa ( sm, Amerika Sāmoa, ; also ' or ') is an unincorporated territory of the United States located in the South Pacific Ocean, southeast of the island country of Samoa. Its location is centered on . It is east of the International Date Line, while Samoa is west of the Line. The total land area is , slightly more than Washington, D.C. American Samoa is the southernmost territory of the United States and one of two U.S. territories south of the Equator, along with the uninhabited Jarvis Island. Tuna products are the main exports, and the main trading partner is the rest of the United States. American Samoa consists of five main islands and two coral atolls. The largest and most populous island is Tutuila, with the Manuʻa Islands, Rose Atoll and Swains Island also included in the territory. All islands except for Swains Island are part of the Samoan Islands, west of the Cook Islands, north of Tonga, and some south of Tokelau. To the west are the islands of the Wall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Pacific Ocean
South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both east and west. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþaz'' ("south"), possibly related to the same Proto-Indo-European root that the word ''sun'' derived from. Some languages describe south in the same way, from the fact that it is the direction of the sun at noon (in the Northern Hemisphere), like Latin meridies 'noon, south' (from medius 'middle' + dies 'day', cf English meridional), while others describe south as the right-hand side of the rising sun, like Biblical Hebrew תֵּימָן teiman 'south' from יָמִין yamin 'right', Aramaic תַּימנַא taymna from יָמִין yamin 'right' and Syriac ܬܰܝܡܢܳܐ taymna from ܝܰܡܝܺܢܳܐ yamina (hence the name of Yemen, the land to the south/right of the Levant). Navigation By convention, the ''bottom or down-facing side'' of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subaerial Eruption
A subaerial eruption is any sort of volcanic eruption that occurs on the Earth's surface, or in the open air subaerial, 'under the air', and not underwater or underground. They generally produce pyroclastic flows, lava fountains, and lava flows, which are commonly classified in different subaerial eruption types, including Plinian eruption, Plinian, Peléan eruption, Peléan, and Hawaiian eruptions. Subaerial eruptions contrast with Wiktionary:subaqueous, subaqueous, submarine eruption, submarine and subglacial eruptions which all originate below differing forms of a water surface. References Volcanic eruption types {{Types of volcanic eruptions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachyte
Trachyte () is an extrusive igneous rock composed mostly of alkali feldspar. It is usually light-colored and aphanitic (fine-grained), with minor amounts of mafic minerals, and is formed by the rapid cooling of lava enriched with silica and alkali metals. It is the volcanic equivalent of syenite. Trachyte is common wherever alkali magma is erupted, including in late stages of ocean island volcanismMacDonald 1983, pp. 51-52 and in continental rift valleys, above mantle plumes,Philpotts and Ague 2009, pp. 390-394 and in areas of back-arc extension. Trachyte has also been found in Gale crater on Mars. Trachyte has been used as decorative building stone and was extensively used as dimension stone in the Roman Empire and the Republic of Venice. Chemical composition Trachyte has a silica content of 60 to 65% and an alkali oxide content of over 7%. This gives it less SiO2 than rhyolite and more (Na2O plus K2O) than dacite. These chemical differences are consistent with the positio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caldera
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is gone. 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 Volcanic crater, 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 each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018. Etymology The term ''caldera'' comes from Spanish language, S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pago Pago Harbor
Pago Pago Harbor on Tutuila Island in American Samoa is one of the world's largest natural harbors. The capital, Pago Pago is located on the inner reaches of the harbor, close to its northwesternmost point. It has the highest annual rainfall of any harbor in the world. It is also considered one of the best and deepest deepwater harbors in the South Pacific Ocean or in Oceania as a whole. Pago Pago Bay is over deep and long. As part of the Pago Volcano caldera, the harbor is 50% landlocked, Villages along the harbor include several communities in the Greater Pago Pago Area, including Utulei, Fagatogo, Malaloa, Pago Pago proper, Satala, Anua and Atu'u. The legislature and High Court are located in Fagatogo, while the executive offices are located in Utulei. Pago Pago Harbor is surrounded and sheltered by mountains such as Mount ʻAlava, Mount Matafao and Rainmaker Mountain (Mount Pioa). The entrance to Pago Pago Bay is marked by two mountains: Peiva in the east and Matafao P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Park Of American Samoa
The National Park of American Samoa is a national park in the United States territory of American Samoa, distributed across three islands: Tutuila, Ofu, and Ta‘ū. The park preserves and protects coral reefs, tropical rainforests, fruit bats, and the Samoan culture. Popular activities include hiking and snorkeling. Of the park's , is coral reefs and ocean. The park is the only American National Park Service system unit south of the equator. History Delegate Fofó Iosefa Fiti Sunia introduced a bill in 1984, at the request from Bat Preservers Association and Dr. Paul Cox, to include American Samoa in the Federal Fish and Wildlife Restoration Act. The purpose of the bill was to protect the habitat for the Flying fox as well as to protect the old rainforest. The bill marked the beginning of American Samoa's entry into the U.S. National Park System. The National Park Service began the work of establishing the national park in July 1987. The National Park of American Samoa wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of American Samoa
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 diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tutuila
Tutuila is the main island of American Samoa (and its largest), and is part of the archipelago of Samoan Islands. It is the third largest island in the Samoan Islands chain of the Central Pacific. It is located roughly northeast of Brisbane, Australia and lies over to the northeast of Fiji. It contains a large, natural harbor, Pago Pago Harbor, where Pago Pago, the capital of American Samoa, is situated. Pago Pago International Airport is also located on Tutuila. The island’s land expanse is about 68% of the total land area of American Samoa. With 56,000 inhabitants, it is also home to 95% of the population of American Samoa. The island has six terrestrial and three marine ecosystems. Tutuila has mountainous regions, the highest point of which is ). The island is attractive to tourists because of its beaches, coral reefs, and World War II relics, as well as its suitability for sporting activities such as scuba diving, snorkeling, and hiking. Etymology It is said that the nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
