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Pichilemu Fault
The Pichilemu Fault ( es, Falla de Pichilemu), also referred to as the Pichilemu-Vichuquén Fault (''Falla de Pichilemu-Vichuquén''), is a Chilean geological fault, located in Libertador General Bernardo O'Higgins Region, some kilometers away from Pichilemu, at a depth of . The fault is long and wide. Activity The fault became reactivated after the February 27, 2010, Chile earthquake, and gave rise to the 2010 Pichilemu earthquake on March 11. At first, it was not known if it was formed during the February earthquake, or if it was just reactivated; however, according to University of Chile geologist José Cembrano, " tcorresponds to a long-live fault (in a million years time) whose activity had not been detected before." Ancient activity of the fault has been theorized to have occurred in the Late Paleozoic and Late Mesozoic. The reverse fault has a north-northeast to south-southwest strike and dips to the east. "This is a new record that we have found, and it explains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pichilemu
Pichilemu (, ), originally known as Pichilemo, is a beach resort city and commune in central Chile, and capital of Cardenal Caro Province in the O'Higgins Region. The commune comprises an urban centre and twenty-two villages, including Ciruelos, Cáhuil, and Cardonal de Panilonco. It is located southwest of Santiago. Pichilemu had over 13,000 residents as of 2012. The Pichilemu area was long populated by the indigenous Promaucaes. European-Chilean development began in the mid-sixteenth century, as ''conquistador'' Pedro de Valdivia gave Juan Gómez de Almagro the Topocalma encomienda (which included the current territory of Pichilemu) in January 1541. Pichilemu was established as a subdelegation on 16 August 1867, and later as an "autonomous commune" on 22 December 1891, by decree of the President Jorge Montt and Interior Minister Manuel José Irarrázabal. Agustín Ross Edwards, a Chilean politician and member of the Ross Edwards family, planned to develop it as a beach res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China Internet Information Center
China Internet Information Center (; or 中国网/网上中国) is a state-run web portal of the People's Republic of China and published under the auspices of the State Council Information Office and the China International Publishing Group. Its editor-in-chief is Wang Xiaohui, who also serves as a vice minister of the Propaganda Department of the Chinese Communist Party. Localization The site is available in Arabic, Chinese (Simplified), Chinese (Traditional), English, Esperanto, French, German, Japanese, Korean, Russian, and Spanish. See also * Xinhua News Agency Xinhua News Agency (English pronunciation: )J. C. Wells: Longman Pronunciation Dictionary, 3rd ed., for both British and American English, or New China News Agency, is the official state news agency of the People's Republic of China. Xinhua ... * China News Service References External links Official site Chinese news websites Web portals Chinese-language websites Chinese propaganda organis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of O'Higgins Region
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquakes In Chile
__NOTOC__ Chile lay in a region which is adjacent to the fast-moving Nazca Plate, and has high tectonic activity. The records for earlier centuries are apparently incomplete. Of the world's 46 known earthquakes with M ≥ 8.5 since the year 1500, one-third occurred in Chile and are shown in the map to the side. Some virtually have the same epicenters like the 1604 and 1868 (in Arica), the 1730 and 1822 (in Valparaíso), the 1751 and 1835 (in Concepción), and the 1575 and 1837 (in Valdivia). The strongest known recorded in modern times was also in Chile, the 1960 Valdivia earthquake. Earthquakes See also *Geology of Chile References * Servicio sismológico Universidad de ChileSismos importantes o destructivos desde 1570Historic World Earthquakes: Chile United States Geological Survey External links {{DEFAULTSORT:List Of Earthquakes In Chile Earthquakes Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thrust Faults
A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. If the angle of the fault plane is lower (often less than 15 degrees from the horizontal) and the displacement of the overlying block is large (often in the kilometer range) the fault is called an ''overthrust'' or ''overthrust fault''. Erosion can remove part of the overlying block, creating a ''fenster'' (or ''window'') – when the underlying block is exposed only in a relatively small area. When erosion removes most of the overlying block, leaving island-like remnants resting on the lower block, the remnants are called ''klippen'' (singular ''klippe''). Blind thrust faults If the fault plane terminates before it reaches the Earth's surface, it is referred to as a ''blind thrust'' fault. Because of the lack of surface evidence, blind thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Faults
An active fault is a fault that is likely to become the source of another earthquake sometime in the future. Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. * Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause. Effects of movement on an active fault include strong ground motion, surface faulting, tectonic deformation, landslides and rockfalls, liquefaction, tsunamis, and seiches. Quaternary faults are those active faults that have been recognized at the surface and which have evidence of movement during the Quaternary Period. Related geological disciplines for ''active-fault'' studies include geomorphology, seismology, reflection seismology, plate tectonics, geodetics and remote sensing, risk analysis, and others. Location Active faults tend to occur in the vicinity of tectonic plate boundaries, and active fault research has focused ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Faults Of Chile
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. It also includes studies of earthquake environmental effects such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic, atmospheric, and artificial processes such as explosions. A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of Earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology. History Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus (c. 585 BCE), Anaximenes of Miletus (c. 550 BCE), Aristotle (c. 340 BCE), and Zhan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Ramón Fault
The San Ramón ( es, Falla de San Ramón) is a Chilean geological fault, located in eastern Santiago Metropolitan Region, passing through the eastern part of Santiago marking the boundary between the Chilean Central Valley and the Andes. As an active thrust fault it constitutes a seismic hazard zone for the densely populated Santiago. A large number of homes and educational centers have been built on or near the fault, along with a gas plant in Peñalolén. The Chilean Nuclear Energy Commission has a reactor in La Reina, very close to the fault, which has raised concerns among the population. It runs 5 kilometers underground and extends for 25 kilometers in a north–south direction, lying between the Mapocho River and Maipo River. It is known to pass underneath the communes of Vitacura, Las Condes, La Reina, Peñalolén, La Florida and Puente Alto, and suspected to continue into Lo Barnechea and Pirque at its extremes. Due to its shallowness, it can cause very destructive super ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rancagua
Rancagua () is a city and commune in central Chile and part of the Rancagua conurbation. It is the capital of the Cachapoal Province and of the O'Higgins Region, located south of the national capital of Santiago. It was originally named Santa Cruz de Triana by Spanish colonists. In 2012, its population was 232,211. The main economic activities range from mining, tourism, agriculture, timber, food production and services to minor industrial activities. The city also serves as the administrative and legal center of the region. Together with Machalí and Gultro, it forms the Rancagua conurbation. After Curicó, Talca and Concepción, it is one of the most important and densely populated cities of the south central zone of Chile. History Foundation period The Rancagua Valley was occupied by the local Picunche. They fell briefly under the control of the Inca Empire in the 15th century. Its remains in structures can still be found near the city today. Through their civil engineeri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonics
Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents known as cratons, and the ways in which the relatively rigid plates that constitute the Earth's outer shell interact with each other. Tectonics also provide a framework for understanding the earthquake and volcanic belts that directly affect much of the global population. Tectonic studies are important as guides for economic geologists searching for fossil fuels and ore deposits of metallic and nonmetallic resources. An understanding of tectonic principles is essential to geomorphologists to explain erosion patterns and other Earth surface features. Main types of tectonic regime Extensional tectonics Extensional tectonics is associated with the stretching and thinning of the crust or the lithosphere. This type of tectonics is found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike And Dip
Strike and dip is a measurement convention used to describe the orientation, or attitude, of a planar geologic feature. A feature's strike is the azimuth of an imagined horizontal line across the plane, and its dip is the angle of inclination measured downward from horizontal. They are used together to measure and document a structure's characteristics for study or for use on a geologic map. A feature's orientation can also be represented by dip and dip direction, using the azimuth of the dip rather than the strike value. Linear features are similarly measured with trend and plunge, where "trend" is analogous to dip direction and "plunge" is the dip angle. Strike and dip are measured using a compass and a clinometer. A compass is used to measure the feature's strike by holding the compass horizontally against the feature. A clinometer measures the features dip by recording the inclination perpendicular to the strike. These can be done separately, or together using a tool such a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
