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Furnas Formation
Furnas is a civil parish in the municipality of Povoação on the island of São Miguel in the Portuguese Azores. The population in 2011 was 1,439, in an area of 34.43 km2. The parish is one of the largest in the island and in the Azores. It is located east of Lagoa and Ponta Delgada, west of Povoação and southeast of Ribeira Grande. History One of the earliest references to Furnas came from the harvesting of trees in the valley of Furnas, in order to assist the construction of many of the homes destroyed by the 1522 earthquakes and landslides in Vila Franca do Campo. This includes numerous trees used to rebuild the parochial church, a project begun by Donatary-Captain Rui Gonçalves da Câmara. In 1553, his predecessor Manuel da Câmara, issued an edict to re-plant these trees after the area was nearly deforested, and roadways were expanded under his son, Rui Gonçalves da Câmara, in order to develop the area, allowing cattle herding in the valley after 1577. Still ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
São Miguel Island
São Miguel Island (; ), nicknamed "The Green Island" (), is the largest and most populous island in the Portugal, Portuguese archipelago of the Azores. The island covers and has around 140,000 inhabitants, with 45,000 people residing in Ponta Delgada, the archipelago's largest city. History In 1427, São Miguel became the second of the islands discovered by Gonçalo Velho Cabral to be settled by colonists from continental Portugal. This date is uncertain, as it is believed that the island was discovered between 1426 and 1437 and inscribed in portolans from the middle of the 15th century. Its discovery was later recorded by Priesthood (Catholic Church), Father Gaspar Frutuoso in the seminal history of the Azores, ''Saudades da Terra'', as he began: "This island of São Miguel where...we are, is mountainous and covered in ravines, and it was, when we discovered it, covered in trees...due to its humidity, with its water showers and ravines warm with sun..." It was sometime afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maia (Ribeira Grande)
Maia is a civil parish in the municipality of Ribeira Grande in the Portuguese archipelago of the Azores. The population in 2011 was 1,900, in an area of 21.97 km². Maia is the largest parish by area in Ribeira Grande. History The first Azorean historians referred to this parish, owing to the settlement of Inês da Maia, a noblewoman that established a home here in the 15th century. The settlement of the community dates back to the early settlement of Ribeira Grande; the construction of the main church was begun at the end of the 15th century. By 1522, it had its third vicar. Maia became one of the northern coasts more rapidly growing places: one hundred years after its foundation it had become a civil parish. Its fertile terrains, one of the more productive on the island of São Miguel, and its port access, meant that small industry developed easily in this area. In particular, the tobacco, tea and cement industries developed over the course of the next centuries. Maia w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes
A volcano is commonly defined as a vent or fissure 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 because most of Earth's plate boundaries are underwater, most volcanoes 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 resulting from divergent tectonic activity are usually non-explosive whereas those resulting from convergent tectonic activity cause violent eruptions."Mid-ocean ridge tectonics, volcanism and geomorphology." Geology 26, no. 455 (2001): 458. https://macdonald.faculty.geol.ucsb.edu/papers/Macdonald%20Mid-Ocean%20Ridge%20Tectonics.pdf Volcanoes can also form where there is stretching ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachytic
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 (or shallow intrusions) 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 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Arc
A volcanic arc (also known as a magmatic arc) is a belt of volcanoes formed above a subducting oceanic tectonic plate, with the belt arranged in an arc shape as seen from above. Volcanic arcs typically parallel an oceanic trench, with the arc located further from the subducting plate than the trench. The oceanic plate is saturated with water, mostly in the form of hydrous minerals such as micas, amphiboles, and serpentines. As the oceanic plate is subducted, it is subjected to increasing pressure and temperature with increasing depth. The heat and pressure break down the hydrous minerals in the plate, releasing water into the overlying mantle. Volatiles such as water drastically lower the melting point of the mantle, causing some of the mantle to melt and form magma at depth under the overriding plate. The magma ascends to form an arc of volcanoes parallel to the subduction zone. Volcanic arcs are distinct from volcanic chains formed over hotspots in the middle of a tecton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovolcano
A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and explosive eruptions. Some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and solidifies before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less viscous mafic magma. Extensive felsic lava flows are uncommon, but can travel as far as 8 km (5 mi). The term ''composite volcano'' is used because strata are usually mixed and uneven instead of neat layers. They are among the most common types of volcanoes; more than 700 stratovolcanoes have erupted lava during the Holocene Epoch (the last 11,700 years), and many ol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Furnas Caldeiras Vulcânicas —aerial
Furnas is a Freguesia (Portugal), civil parish in the concelho, municipality of Povoação on the island of São Miguel Island, São Miguel in the Portugal, Portuguese Azores. The population in 2011 was 1,439, in an area of 34.43 km2. The parish is one of the largest in the island and in the Azores. It is located east of Lagoa, Azores, Lagoa and Ponta Delgada, west of Povoação and southeast of Ribeira Grande, São Miguel, Ribeira Grande. History One of the earliest references to Furnas came from the harvesting of trees in the valley of Furnas, in order to assist the construction of many of the homes destroyed by the Timeline of natural disasters in the Azores, 1522 earthquakes and landslides in Vila Franca do Campo. This includes numerous trees used to rebuild the parochial church, a project begun by Captaincies of the Azores#History#Donatary-Captaincy of São Miguel, Donatary-Captain Rui Gonçalves da Câmara II, Rui Gonçalves da Câmara. In 1553, his predecessor Manuel da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
