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Crough Seamount
Crough Seamount (named after the geologist Thomas Crough) is a seamount in the Pacific Ocean, within the exclusive economic zone of Pitcairn. It rises to a depth of and is paired with a taller but overall smaller seamount to the east. This seamount has a flat top and probably formed an island in the past. It is about 7-8 million years old, although a large earthquake recorded at its position in 1955 may indicate a volcanic eruption, recent eruption. The seamount appears to be part of a long geological lineament with the neighbouring Henderson Island (Pitcairn Islands), Henderson and Ducie Island, Ducie islands, as well as the southern Tuamotus and Line Islands. Such a lineament may have been generated by a hotspot (geology), hotspot; the nearby Easter hotspot is a candidate hotspot. Geology and geomorphology Regional The region lies between and around the islands of Pitcairn and Easter Island. There, the East Pacific Rise is interrupted by a trapezoid microplate known as th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologist
A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, earth science, or geophysics, although backgrounds in physics, chemistry, biology, and other sciences are also useful. Field research (field work) is an important component of geology, although many subdisciplines incorporate laboratory and digitalized work. Geologists can be classified in a larger group of scientists, called geoscientists. Geologists work in the energy and mining sectors searching for natural resources such as petroleum, natural gas, precious and base metals. They are also in the forefront of preventing and mitigating damage from natural hazards and disasters such as earthquakes, volcanoes, tsunamis and landslides. Their studies are used to warn the general public of the occurrence of these events. Geologists are also important contributors to climate ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sala Y Gomez
Sala or SALA may refer to: Places Europe * Sala, the historical name of the river IJssel and home of the Salii Franks * Sala (Estonian island), one of the Uhtju islands * Sala Baganza, a municipality in Emilia-Romagna, Italy * Sala Bolognese, a municipality in Emilia-Romagna, Italy * Sala Consilina, a municipality in Campania, Italy * Sala Municipality, Latvia, a municipality in Latvia * Sala, Sala Parish, a village in Latvia, an administrative centre of Sala municipality * Šaľa, Slovakia, a city in Slovakia * Sala Municipality, Sweden, a municipality in Sweden * Sala, Sweden, a city in Sweden, seat of Sala Municipality * Sala Parish (other), parishes (''socken'') in Sweden Africa * Salé ( ber, Sala, link=no), Morocco * Sala, an ancient city at Rabat, Morocco * Sala, Houet, a village in Satiri Department, Houet Province, Burkina Faso * Sala, Ziro, a village in Ziro Province, Burkina Faso * Sala Colonia, a Phoenician and Roman colony whose ruins are located in pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coral
Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height. A set of tentacles surround a central mouth opening. Each polyp excretes an exoskeleton near the base. Over many generations, the colony thus creates a skeleton characteristic of the species which can measure up to several meters in size. Individual colonies grow by asexual reproduction of polyps. Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously overnight, often around a full moon. Fertilized eggs form planulae, a mobile early form of the coral polyp which, when m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subsidence
Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities. Subsidence involves little or no horizontal movement, which distinguishes it from slope movement. Processes that lead to subsidence include dissolution of underlying carbonate rock by groundwater; gradual compaction of sediments; withdrawal of fluid lava from beneath a solidified crust of rock; mining; pumping of subsurface fluids, such as groundwater or petroleum; or warping of the Earth's crust by tectonic forces. Subsidence resulting from tectonic deformation of the crust is known as tectonic subsidence and can create accommodation for sediments to accumulate and eventually lithify into sedimentary rock. Ground subsidence is of global concern to geologists, geotechnical engineers, surveyors, engineers, urban planners, landowners, and the public in general.National Research Council, 1991. ''Mitigating losses from land subsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rangiroa
Rangiroa ( Tuamotuan for 'vast sky') or Te Kokōta (Cook Islands Māori for 'the Hyades star cluster') is the largest atoll in the Tuamotus and one of the largest in the world (smaller than Kwajalein in the Marshall Islands and Huvadhu in the Maldives). It is in French Polynesia and is part of the Palliser group. The nearest atoll is Tikehau, to the west. It is about northeast of Tahiti. Rangiroa is home to about 2,500 people on almost . The chief town is Avatoru, in the atoll's northwest. Geography and environment The atoll consists of about 415 motus, islets and sandbars comprising a total land area of about . There are approximately one hundred narrow passages (straits or passes), called ''hoa'', in the fringing reef. The atoll has a flattened elliptic shape, with in length and a width ranging from . The width of land reaches wide and its circumference totals up to . The lagoon has a maximum depth of and its surface is . It is so large that it has its own horizon. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acteon Group
The Acteon Group (Groupe Actéon) is a rather isolated and uninhabited subgroup in the far southeast of the Tuamotu atoll group in French Polynesia. It is located about east-southeast of Tahiti at latitude: 21° 17' 60 S, longitude: 136° 29' W. Atolls The Acteon Group includes four atolls of relatively small size: *Matureivavao *Tenararo *Tenarunga *Vahanga None of the islands on these atolls have permanent inhabitants. History The first recorded European to sight the Acteon Group was Pedro Fernández de Quirós on 5 February 1605. He described the group as ''"four atolls crowned by coconut palms"''. On the different texts describing his voyage by other members of this Spanish expedition they were charted as "Las Cuatro Coronadas" (The four Crowned), "Las Cuatro Hermanas" (The Four Sisters), "Las Virgenes" (The Virgins) or "Las Anegadas" (The Flooded ones). The rediscovery of Acteon Group is generally credited to Thomas Ebrill, captain of the Tahitian trading vessel ''Amp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marutea Sud
Marutea Atoll (Marutea Sud), also known as Lord Hood Island, Marutea-i-runga, and Nuku-nui, is an atoll in the far southeast of the Tuamotu group of French Polynesia. It lies in the east-northeast part of the Gambier (commune), about 72 km northeast from Maria Atoll. Marutea Atoll is irregular in shape and bound by a reef broken by passes into the lagoon. It is long with a maximum width of and a land area of approximately . Its islands are low and flat and the main village, Auorotini, is located at the northern end of the atoll. It is populated by ex Gambier Islanders looking for pearls and maintaining the pearl farms on the atoll. Marutea Sud should not be confused with Marutea Nord located in the western area of the Tuamotu Archipelago at 17˚ 07' S, 143˚ 11' W. History The first recorded European to sight this atoll was Spanish explorer Pedro Fernández de Quirós on 4 February 1606. He called it ''San Telmo''. Other Spanish names were ''San Blas'', given by de Q ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minerve Reef
Minerve may refer to: *Minerva, a Roman goddess *Minerve, Hérault, a village in France * French frigate ''Minerve'' (1782) * French frigate ''Minerve'' (1794) * French frigate ''Président'' (1804) or ''Minerve'' * French frigate ''Minerve'' (1805) * French frigate ''Minerve'' (1809) * French submarine ''Minerve'' (1934) * French submarine ''Minerve'' (S647) * Minerve (airline), a former French airline * ''La Minerve'', a giant ascension balloon envisioned by Étienne-Gaspard Robert Étienne-Gaspard Robert (15 June 1763 – 2 July 1837), often known by the stage name of "Robertson", was a prominent Liégeois (now part of Belgium) physicist, stage magician and influential developer of phantasmagoria. He was described by C ... in 1820 See also * Minerva (other) * French ship Minerve {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oeno Island
Oeno Island ( ) or Holiday Island a coral atoll in the South Pacific Ocean, part of the Pitcairn Islands overseas territory. Geography Located northwest of Pitcairn Island, at . Oeno Atoll measures about in diameter, including the central lagoon, with a total area exceeding . There are two larger and three smaller islets on or within the rim of the atoll. Their aggregate land area is only . Oeno serves as a private holiday site for the few residents of Pitcairn Island, who travel there and stay for two weeks in January because Oeno has beaches while Pitcairn doesn't. The main island (Oeno Island), about in area, has forest and scrub with pandanus and palm trees. It is located in the southwest part of the atoll's lagoon. There is a water tap installed on the island. The maximum elevation is less than . Sandy Island (or Islands) is to the northeast, within the lagoon, and may be an ephemeral island. Three smaller islets are to the south and west of the main island. Importa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuamotu
The Tuamotu Archipelago or the Tuamotu Islands (french: Îles Tuamotu, officially ) are a French Polynesian chain of just under 80 islands and atolls in the southern Pacific Ocean. They constitute the largest chain of atolls in the world, extending (from northwest to southeast) over an area roughly the size of Western Europe. Their combined land area is . This archipelago's major islands are Anaa, Fakarava, Hao and Makemo. The Tuamotus have approximately 16,000 inhabitants. The islands were initially settled by Polynesians, and modern Tuamotuans have inherited from them a shared culture and the Tuamotuan language. The Tuamotus are a French overseas collectivity. History The early history of the Tuamotu islands is generally unknown. Archaeological findings suggest that the western Tuamotus were settled from the Society Islands as early as 900 CE or as late as 1200 CE. DNA evidence suggests that they were settled about 1110 CE. On the islands of Rangiroa, Manihi and Mataiva, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lineament
''See also Line (geometry)'' A lineament is a linear feature in a landscape which is an expression of an underlying geological structure such as a fault. Typically a lineament will appear as a fault-aligned valley, a series of fault or fold-aligned hills, a straight coastline or indeed a combination of these features. Fracture zones, shear zones and igneous intrusions such as dykes can also be expressed as geomorphic lineaments. Lineaments are often apparent in geological or topographic maps and can appear obvious on aerial or satellite photographs. There are for example, several instances within Great Britain. In Scotland the Great Glen Fault and Highland Boundary Fault give rise to lineaments as does the Malvern Line in western England and the Neath Disturbance in South Wales. The term 'megalineament' has been used to describe such features on a continental scale. The trace of the San Andreas Fault might be considered an example.Whitten & Brooks, The Penguin Dictionary of Ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fracture Zone
A fracture zone is a linear feature on the ocean floor—often hundreds, even thousands of kilometers long—resulting from the action of offset mid-ocean ridge axis segments. They are a consequence of plate tectonics. Lithospheric plates on either side of an active transform fault move in opposite directions; here, strike-slip activity occurs. Fracture zones extend past the transform faults, away from the ridge axis; seismically inactive (because both plate segments are moving in the same direction), they display evidence of past transform fault activity, primarily in the different ages of the crust on opposite sides of the zone. In actual usage, many transform faults aligned with fracture zones are often loosely referred to as "fracture zones" although technically, they are not. Structure and formation Mid-ocean ridges are divergent plate boundaries. As the plates on either side of an offset mid-ocean ridge move, a transform fault forms at the offset between the two ridges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
