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2015 Illapel Earthquake
The 2015 Illapel earthquake occurred offshore from Illapel (Coquimbo region, Chile) on September 16 at 19:54:32 Chile Standard Time (22:54:32 UTC), with a moment magnitude of 8.3–8.4. The initial quake lasted between three and five minutes; it was followed by several aftershocks greater than magnitude six and two that exceeded 7.0 moment magnitude. The Chilean government reported 15 deaths, 6 missing and thousands of people affected. In Buenos Aires, Argentina, a man died from a stroke while he was evacuating a building. Earthquake The earthquake occurred on thrust faults along the boundary of the Nazca and South American plates. The region frequently produces large earthquakes, and 15 others of magnitude 7 or higher have taken place within 400 km of the epicenter over the past 100 years. The last big quake that occurred in this region was the 1943 Ovalle earthquake, reaching a magnitude in the range 7.9–8.2; however, comparisons of the associated source time f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth anniv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Tercera
''La Tercera'' ( es, The Third One), formerly known as ''La Tercera de la Hora'' ('the third of the hour'), is a daily newspaper published in Santiago, Chile and owned by Copesa. It is ''El Mercurio''s closest competitor. ''La Tercera'' is part of Periódicos Asociados Latinoamericanos (Latin American Newspaper Association), an organization of fourteen leading newspapers in South America. History The newspaper La Tercera was founded on July 7, 1950 by Picó Cañas family. In the beginning it was called La Tercera de la Hora, as it was the evening edition of the now defunct newspaper ''La Hora''. Later in the 1950s it left aside its connection with La Hora to become a morning paper. Initially, La Tercera was linked to the Radical Party, but in 1965 this association was ended, and it became independent of any political party, system of government or religious confession. In 1970, the newspaper was one of the staunchest opponents to the government of Salvador Allende and in 1973 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santiago (Chile)
Santiago (, ; ), also known as Santiago de Chile, is the capital and largest city of Chile as well as one of the largest cities in the Americas. It is the center of Chile's most densely populated region, the Santiago Metropolitan Region, whose total population is 8 million which is nearly 40% of the country's population, of which more than 6 million live in the city's continuous urban area. The city is entirely in the country's central valley. Most of the city lies between above mean sea level. Founded in 1541 by the Spanish conquistador Pedro de Valdivia, Santiago has been the capital city of Chile since colonial times. The city has a downtown core of 19th-century neoclassical architecture and winding side-streets, dotted by art deco, neo-gothic, and other styles. Santiago's cityscape is shaped by several stand-alone hills and the fast-flowing Mapocho River, lined by parks such as Parque Forestal and Balmaceda Park. The Andes Mountains can be seen from most point ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greater Valparaiso
Greater may refer to: *Greatness, the state of being great *Greater than, in inequality * ''Greater'' (film), a 2016 American film *Greater (flamingo), the oldest flamingo on record * "Greater" (song), by MercyMe, 2014 *Greater Bank, an Australian bank *Greater Media Greater Media, Inc., known as Greater Media, was an American media company that specialized in radio stations. The markets where they owned radio stations included Boston, Detroit, Philadelphia, Charlotte, and the state of New Jersey. The compa ..., an American media company See also * * {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greater La Serena
Greater La Serena is a Chilean conurbation that includes Coquimbo and La Serena communes in the Coquimbo Region. It has a population of 412,845, according to the 2012 census, and thus is the fourth largest metropolitan area in Chile, after Santiago, Greater Valparaiso Greater may refer to: *Greatness, the state of being great *Greater than, in inequality * ''Greater'' (film), a 2016 American film *Greater (flamingo), the oldest flamingo on record * "Greater" (song), by MercyMe, 2014 *Greater Bank, an Australian ... and Greater Concepcion. Its population has doubled over the last 20 years, mainly because of economic growth and the development of tourism in its largest city, La Serena. As with many Chilean conurbations, it has an industrial and port sector, as well as a residential and tourist sector in which the beaches are the main attraction. Populated places in Elqui Province La Serena Coasts of Coquimbo Region {{Coquimbo-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercalli Intensity Scale
The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the effects of an earthquake at a given location, distinguished from the earthquake's inherent force or strength as measured by seismic magnitude scales (such as the "" magnitude usually reported for an earthquake). While shaking is caused by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. Deeper earthquakes also have less interaction with the surface, and their energy is spread out across a larger volume. Shaking intensity is localized, generally diminishing with distance from the earthquake's epicenter, but can be amplified in sedimentary basins and certain kinds of unconsolidated soils. Intensity scales empirically categorize the intensity of shaking based on the effect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coquimbo Region
The Coquimbo Region ( es, Región de Coquimbo, ) is one of Chile's 16 regions (first order administrative divisions). It is bordered by Atacama to the north, Valparaíso to the south, Argentina to the east, and the Pacific Ocean to the west. It is approximately north of the national capital, Santiago. The capital and largest city is La Serena. Other important cities include the seaport Coquimbo and the agricultural centre Ovalle. Geography and ecology The Coquimbo Region forms the narrowest part, or 'waist' of Chile, and is hence one of the country's more mountainous regions, as the Andes range runs closer to the sea than elsewhere. The region has notable marine species as well as taxa that are associated with the mountainous regions. With respect to marine organisms, the upwelling areas encourage bioproductivity off of this Pacific Coast area of Chile. In the southern mountainous areas of the Coquimbo Region, the rare and endangered Chilean Wine Palm is found, whose ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foreshock
A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full sequence of events has happened. Occurrence Foreshock activity has been detected for about 40% of all moderate to large earthquakes, and about 70% for events of M>7.0. They occur from a matter of minutes to days or even longer before the main shock; for example, the 2002 Sumatra earthquake is regarded as a foreshock of the 2004 Indian Ocean earthquake with a delay of more than two years between the two events. Some great earthquakes (M>8.0) show no foreshock activity at all, such as the M8.6 1950 India–China earthquake. The increase in foreshock activity is difficult to quantify for individual earthquakes but becomes apparent when combining the results of many different events. From such combined observations, the increase before the mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Moment
Seismic moment is a quantity used by seismologists to measure the size of an earthquake. The scalar seismic moment M_0 is defined by the equation M_0=\mu AD, where *\mu is the shear modulus of the rocks involved in the earthquake (in pascals (Pa), i.e. newtons per square meter) *A is the area of the rupture along the geologic fault where the earthquake occurred (in square meters), and *D is the average slip (displacement offset between the two sides of the fault) on A (in meters). M_0 thus has dimensions of torque, measured in newton meters. The connection between seismic moment and a torque is natural in the body-force equivalent representation of seismic sources as a double-couple (a pair of force couples with opposite torques): the seismic moment is the torque of each of the two couples. Despite having the same dimensions as energy, seismic moment is not a measure of energy. The relations between seismic moment, potential energy drop and radiated energy are indirect and appro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1943 Ovalle Earthquake
The Coquimbo Region of Chile was affected by a major earthquake on 6 April 1943 at 12:07 local time (16:07 UTC). It had a magnitude of between 7.9 and 8.2 on the moment magnitude scale. It triggered a minor tsunami that caused local damage along the coast. A total of 11 people were killed, including a group of five miners. Tectonic setting Central Chile lies above the destructive plate boundary where the Nazca Plate subducts beneath the South American Plate. There have been many large earthquakes caused by rupture along the plate interface. Illapel has been struck by major earthquakes in 1730, 1880, 1943 and 2015. Damage The earthquake caused major damage to Ovalle, Illapel, Salamanca Salamanca () is a city in western Spain and is the capital of the Province of Salamanca in the autonomous community of Castile and León. The city lies on several rolling hills by the Tormes River. Its Old City was declared a UNESCO World Heritag ... and Combarbala. At the La Cocinera copper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South American Plate
The South American Plate is a major tectonic plate which includes the continent of South America as well as a sizable region of the Atlantic Ocean seabed extending eastward to the African Plate, with which it forms the southern part of the Mid-Atlantic Ridge. The easterly edge is a divergent boundary with the African Plate; the southerly edge is a complex boundary with the Antarctic Plate, the Scotia Plate, and the Sandwich Plate; the westerly edge is a convergent boundary with the subducting Nazca Plate; and the northerly edge is a boundary with the Caribbean Plate and the oceanic crust of the North American Plate. At the Chile Triple Junction, near the west coast of the Taitao–Tres Montes Peninsula, an oceanic ridge known as the Chile Rise is actively subducting under the South American Plate. Geological research suggests that the South American Plate is moving westward away from the Mid-Atlantic Ridge: "Parts of the plate boundaries consisting of alternations of relati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nazca Plate
The Nazca Plate or Nasca Plate, named after the Nazca region of southern Peru, is an oceanic tectonic plate in the eastern Pacific Ocean basin off the west coast of South America. The ongoing subduction, along the Peru–Chile Trench, of the Nazca Plate under the South American Plate is largely responsible for the Andean orogeny. The Nazca Plate is bounded on the west by the Pacific Plate and to the south by the Antarctic Plate through the East Pacific Rise and the Chile Rise respectively. The movement of the Nazca Plate over several hotspots has created some volcanic islands as well as east-west running seamount chains that subduct under South America. Nazca is a relatively young plate both in terms of the age of its rocks and its existence as an independent plate having been formed from the break-up of the Farallon Plate about 23 million years ago. The oldest rocks of the plate are about 50 million years old. Boundaries East Pacific and Chile Rise A triple junctio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
