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1957 Sangchal Earthquake
The 1957 Sangchal earthquake struck northern Iran's Mazandaran province on 2 July 1957. It had a moment magnitude of 6.6 or 7.1 (), focal depth of , and maximum Modified Mercalli intensity of IX (''Violent''). It devastated many communities in the Alborz Mountains and caused an estimated 1,500 fatalities. Damage was estimated at US$ 25 milion. Tectonic setting The Iranian plateau is a region of highly deformed crust wedged between the Arabian Plate to the southwest and Eurasian Plate to the northeast. Crustal deformation is dictated by the /yr oblique- convergence between the two tectonic plates. Deformation is accommodated by reverse and strike-slip faulting. In northern and southern Iran, thrusting allows convergence through crustal thickening to take place. Most of the convergence is accommodated along fold and thrust belts of the Zagros, Alborz, Kopet Dag mountains, and in eastern Iran, where seismicity is high. Seismicity in the central plateau is low due to its ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
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] |
Tectonic Block
A tectonic block is a part of the Earth's crust that can be treated as a solid rigid crustal block or lithospheric section. A tectonic block may be bounded by faults. It may move from one place to another because of a tectonic shift, and they may also be rotated. A tectonic block may have a proper name for example, the Muness Phyllite Block (which is located in Unst and Uyea in Scotland), or the South China Block The Yangtze Plate, also called the South China Block or the South China Subplate, comprises the bulk of southern China. It is separated on the east from the Okinawa Plate by a rift that forms the Okinawa Trough which is a back-arc basin, on the so .... Early use of the term tectonic block referred to the blocks of rock on either side of a fault. Continental regions may be subdivided into tectonic blocks which are mapped in order to determine earthquake risk. References Tectonics {{tectonics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dehestan (administrative Division)
Dehestan ( fa, دهستان, lit=rural district, also Romanized Romanization or romanisation, in linguistics, is the conversion of text from a different writing system to the Roman (Latin) script, or a system for doing so. Methods of romanization include transliteration, for representing written text, and ... as "dehestān") is a type of administrative division of Iran. It is above the village and under the bakhsh. , there were 2,400 dehestans in Iran. References Subdivisions of Iran Types of administrative division {{Iran-gov-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Talar River
Talar դալար is a Western Armenian name for females. It's meaning is symbolic of the Evergreen Tree. The talar or talaar ( fa, تالار) is the throne hall of the Persian monarch that is open to the public. It includes a throne carved on the rock-cut tomb of Darius at Naqsh-e Rostam, near Persepolis, and above the portico which was copied from his palace. The ''Talar Divan Khaneh'' built by Fath Ali Shah is an example of this pavilion. Description In ancient times, as depicted in the sculptured facade of Darius tomb at Persepolis show, the talar had three tiers, with Atlant statues upholding each. This design typified the subject-people of the monarch. The talar built by the Qajar dynasty The Qajar dynasty (; fa, دودمان قاجار ', az, Qacarlar ) was an IranianAbbas Amanat, ''The Pivot of the Universe: Nasir Al-Din Shah Qajar and the Iranian Monarchy, 1831–1896'', I. B. Tauris, pp 2–3 royal dynasty of Turkic peoples ... as part of the Royal Pala ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meizoseismal Area
The meizoseismal area in an earthquake is the area of maximum damage. For example, in the Charleston, South Carolina, earthquake of 1886, the meizoseismal area was an area about twenty by thirty miles stretching northeast between Charleston and Jedburg and incorporating Summerville. The estimated epicenter was near Middleton Place Middleton Place is a plantation in Dorchester County, along the banks of the Ashley River west of the Ashley and about northwest of downtown Charleston, in the U.S. state of South Carolina. Built in several phases during the 18th and 19th cent .... References Seismology {{seismology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicholas Ambraseys
Nicholas Neocles Ambraseys FICE FREng (Greek: Νικόλαος Αμβράζης του Νεοκλή, 19 January 1929 – 28 December 2012) was a Greek engineering seismologist. He was emeritus professor of engineering seismology and senior research fellow at Imperial College London. For many years Ambraseys was considered the leading figure and an authority in earthquake engineering and seismology in Europe. Curriculum Ambraseys studied rural and surveying engineering at the National Technical University of Athens ( Diploma in 1952) and then civil engineering at Imperial College, specialising in soil mechanics and engineering seismology. He worked with Professors Alec Skempton and Alan W. Bishop and obtained his PhD degree in 1958; his thesis title was "The seismic stability of earth dams". He joined the staff in 1958 as a lecturer and he was appointed a reader in engineering seismology in 1968 and full professor of engineering seismology in 1974. In 1968 he established t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Damavand
Mount Damavand ( fa, دماوند ) is a dormant stratovolcano, the highest peak in Iran and Western Asia and the highest volcano in Asia and the 2nd highest volcano in the Eastern Hemisphere (after Mount Kilimanjaro), at an elevation of . Damāvand has a special place in Persian mythology and folklore. It is in the middle of the Alborz range, adjacent to ''Varārū'', ''Sesang'', ''Gol-e Zard'', and ''Mīānrūd''. It is near the southern coast of the Caspian Sea, in Amol County, Mazandaran Province, northeast of the city of Tehran. Mount Damāvand is the 12th most prominent peak in the world and the second most prominent in Asia after Mount Everest. It is part of the Volcanic Seven Summits mountaineering challenge. Symbolism and mythology Damavand is a significant mountain in Persian mythology. It is the symbol of Iranian resistance against despotism and foreign rule in Persian poetry and literature. In Zoroastrian texts and mythology, the three-headed dragon Aži D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fumarolic Activity
A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcanic activity, but fumarole activity can also precede a volcanic eruption and has been used for eruption prediction. Most fumaroles die down within a few days or weeks of the end of an eruption, but a few are persistent, lasting for decades or longer. An area containing fumaroles is known as a fumarole field. The predominant vapor emitted by fumaroles is steam, formed by the circulation of groundwater through heated rock. This is typically accompanied by volcanic gases given off by magma cooling deep below the surface. These volcanic gases include sulfur compounds, such as various sulfur oxides and hydrogen sulfide, and sometimes hydrogen chloride, hydrogen fluoride, and other gases. A fumarole that emits significant sulfur compounds is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Faulting
In seismology, surface rupture (or ground rupture, or ground displacement) is the visible offset of the ground surface when an earthquake rupture along a fault affects the Earth's surface. Surface rupture is opposed by buried rupture, where there is no displacement at ground level. This is a major risk to any structure that is built across a fault zone that may be active, in addition to any risk from ground shaking. Surface rupture entails vertical or horizontal movement, on either side of a ruptured fault. Surface rupture can affect large areas of land. __TOC__ Lack of surface rupture Not every earthquake results in surface rupture, particularly for smaller and deeper earthquakes. In some cases, however, the lack of surface effects is because the fault that moved does not reach the surface. For example, the 1994 Northridge earthquake had a moment magnitude of 6.7, caused major damage in the Los Angeles area, occurred at below the Earth's surface, but did not cause surfa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1990 Manjil–Rudbar Earthquake
The 1990 Manjil–Rudbar earthquake occurred on Thursday, June 21, 1990 at in northern Iran. The shock had a moment magnitude of 7.4 and a Mercalli Intensity of X (''Extreme''). Damage and casualties Widespread damage occurred to the northwest of the capital city of Tehran, including the cities of Rudbar and Manjil. The National Geophysical Data Center estimated that $8 billion in damage occurred in the affected area. Other earthquake catalogs presented estimates of the loss of life in the range of 35,000–50,000, with a further 60,000–105,000 that were injured. Use in media Acclaimed Iranian director Abbas Kiarostami has fictionally incorporated the earthquake and its effects on northern Iran into multiple films of his. In ''And Life Goes On'' (1992), a director and his son search for child actors from a previous Kiarostami film; ''Where Is the Friend's Home?'' (1986), which was shot in a city that, by the time of the second film's production, is recovering from the earthqua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Rupture
In seismology, an earthquake rupture is the extent of slip that occurs during an earthquake in the Earth's crust. Earthquakes occur for many reasons that include: landslides, movement of magma in a volcano, the formation of a new fault, or, most commonly of all, a slip on an existing fault. Nucleation A tectonic earthquake begins by an initial rupture at a point on the fault surface, a process known as nucleation. The scale of the nucleation zone is uncertain, with some evidence, such as the rupture dimensions of the smallest earthquakes, suggesting that it is smaller than 100 m while other evidence, such as a slow component revealed by low-frequency spectra of some earthquakes, suggest that it is larger. The possibility that the nucleation involves some sort of preparation process is supported by the observation that about 40% of earthquakes are preceded by foreshocks. However, some large earthquakes, such as the M8.6 1950 India - China earthquake., have no foreshocks and it re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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