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An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 In Geology, a crust is the outermost solid shell of a planet or moon Seismic waves are Waves that travel through the Earth, most often as the result of a tectonic Earthquake, sometimes from an Explosion Earthquakes are recorded with a seismometer, also known as a seismograph. Seismometers (from Greek Seism - "the shakes" - and Metro - "I measure" are instruments that measure and record motions of the ground including The moment magnitude of an earthquake is conventionally reported, or the related and mostly obsolete Richter magnitude, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. TalkMoment magnitude scale#Real world examples please.--> The moment magnitude scale The Richter magnitude scale, or more correctly local magnitude M L scale assigns a single number to quantify the amount of seismic energy released Intensity of shaking is measured on the modified Mercalli scale. The Mercalli intensity scale is a scale used for measuring the intensity of an Earthquake.

At the Earth's surface, earthquakes manifest themselves by a shaking and sometimes displacement of the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The epicenter or epicentre is the point on the Earth 's surface that is directly above the Hypocenter or focus the point where an Earthquake A tsunami ((tsuːˈnɑːmi is a series of waves created when The shaking in earthquakes can also trigger landslides and occasionally volcanic activity.

In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves. A phenomenon (from Greek φαινόμενoν, pl φαινόμενα - phenomena) is any observable occurrence Seismic waves are Waves that travel through the Earth, most often as the result of a tectonic Earthquake, sometimes from an Explosion Earthquakes are caused mostly by rupture of geological faults, huge amounts of gas migration, mainly methane deep within the earth, but also by volcanic activity, landslides, mine blasts, and nuclear experiments.

An earthquake's point of initial rupture is called its focus or hypocenter. The hypocenter or hypocentre (literally 'below the center' from the Greek υπόκεντρον) refers to the site of an earthquake or to that of a nuclear The hypocenter or hypocentre (literally 'below the center' from the Greek υπόκεντρον) refers to the site of an earthquake or to that of a nuclear The term epicenter means the point at ground level directly above this. The epicenter or epicentre is the point on the Earth 's surface that is directly above the Hypocenter or focus the point where an Earthquake

Global earthquake epicenters, 1963–1998
Global earthquake epicenters, 1963–1998
Global plate tectonic movement
Global plate tectonic movement

Contents

Naturally occurring earthquakes

Fault types
Fault types

Tectonic earthquakes will occur anywhere within the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. The epicenter or epicentre is the point on the Earth 's surface that is directly above the Hypocenter or focus the point where an Earthquake In Geology a fault, or fault line, is a planar rock fracture which shows evidence of relative movement In the case of transform or convergent type plate boundaries, which form the largest fault surfaces on earth, they will move past each other smoothly and aseismically only if there are no irregularities or asperities along the boundary that increase the frictional resistance. A transform fault is a fault which runs along the boundary of a Tectonic plate. In Plate tectonics, a convergent boundary – also known as a convergent plate boundary or a destructive plate boundary – is an actively deforming region Geology, aseismic creep is measurable surface displacement along a fault in the absence of notable Earthquakes An example is along the Calaveras Most boundaries do have such asperities and this leads to a form of stick-slip behaviour. Stick-slip (or "slip-stick" refers to the phenomenon of a spontaneous jerking motion that can occur while two objects are sliding over each other Once the boundary has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy. This energy is released as a combination of radiated elastic strain seismic waves, frictional heating of the fault surface, and cracking of the rock, thus causing an earthquake. Seismic waves are Waves that travel through the Earth, most often as the result of a tectonic Earthquake, sometimes from an Explosion This process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the Elastic-rebound theory. The elastic rebound theory is an explanation for how energy is spread during earthquakes It is estimated that only 10 percent or less of an earthquake's total energy is radiated as seismic energy. Most of the earthquake's energy is used to power the earthquake fracture growth or is converted into heat generated by friction. A fracture is any local separation or discontinuity plane in a Geologic formation, such as a joint or a fault that divides the rock into two or more Therefore, earthquakes lower the Earth's available elastic potential energy and raise its temperature, though these changes are negligible compared to the conductive and convective flow of heat out from the Earth's deep interior. [1]

Earthquakes away from plate boundaries

Where plate boundaries occur within continental lithosphere, deformation is spread out a over a much larger area than the plate boundary itself. In the case of the San Andreas fault continental transform, many earthquakes occur away from the plate boundary and are related to strains developed within the broader zone of deformation caused by major irregularities in the fault trace (e. The San Andreas Fault is a geologic Transform fault that runs a length of roughly 800 miles (1300 km through California in the United States. g. the “Big bend” region). The Northridge earthquake was associated with movement on a blind thrust within such a zone. Another example is the strongly oblique convergent plate boundary between the Arabian and Eurasian plates where it runs through the northwestern part of the Zagros mountains. The Arabian Plate is one of three Tectonic plates (the African Arabian and Indian crustal plates) which have been moving northward over millions of The Eurasian Plate is a Tectonic plate which includes most of the continent of Eurasia (a landmass consisting of the traditional Continents of Europe The Zagros Mountains (جبال زاجروس (رشته كوههاى زاگرس ( Sorani Kurdish: Zagros - زاگرۆس make up Iran 's and Iraq 's The deformation associated with this plate boundary is partitioned into nearly pure thrust sense movements perpendicular to the boundary over a wide zone to the southwest and nearly pure strike-slip motion along the Main Recent Fault close to the actual plate boundary itself. This is demonstrated by earthquake focal mechanisms. The focal mechanism of an Earthquake describes the inelastic deformation in the source region that generates the seismic waves [2]

All tectonic plates have internal stress fields caused by their interactions with neighbouring plates and sedimentary loading or unloading (e. g. deglaciation). These stresses may be sufficient to cause failure along existing fault planes, giving rise to intra-plate earthquakes.

Deep focus earthquakes

The majority of tectonic earthquakes originate at depths not exceeding tens of kilometers. In subduction zones, where older and colder oceanic crust descends beneath another tectonic plate, Deep focus earthquakes may occur at much greater depths (up to seven hundred kilometers). In Geology, a subduction zone is an area on Earth where two tectonic plates meet and move towards one another with one sliding underneath the other Oceanic crust is the part of Earth's Lithosphere that surfaces in the Ocean basins A deep-focus earthquake is an Earthquake that occurs at depths between 300 and 700 km beneath the Earth's surface These seismically active areas of subduction are known as Wadati-Benioff zones. A Wadati-Benioff zone (also Benioff-Wadati zone or Benioff zone) is a deep active seismic area in a Subduction zone These are earthquakes that occur at a depth at which the subducted lithosphere should no longer be brittle, due to the high temperature and pressure. The lithosphere (IPA, from the Greek λίθος for "rocky" + σφαίρα for "sphere" is the solid outermost shell of a rocky Planet. A possible mechanism for the generation of deep focus earthquakes is faulting caused by olivine undergoing a phase transition into a spinel structure. The Mineral olivine (when gem-quality also called Peridot) is a Magnesium Iron silicate with the formula ( Mg In Thermodynamics, phase transition or phase change is the transformation of a thermodynamic system from one phase to another The spinels are any of a class of Minerals of general formulation XY2 O 4 which Crystallize in the cubic (isometric [3]

Earthquakes and volcanic activity

Earthquakes also often occur in volcanic regions and are caused there, both by tectonic faults and by the movement of magma in volcanoes. Magma (Plurals magmas and magmata) is molten rock that sometimes forms beneath the surface of the Earth (or any other Terrestrial planet Plate tectonics and hotspots Divergent plate boundaries At the Such earthquakes can serve as an early warning of volcanic eruptions.

Earthquake storms

Sometimes a series of earthquakes occur in a sort of earthquake storm, where the earthquakes strike a fault in clusters, each triggered by the shaking or stress redistribution of the previous earthquakes. An earthquake storm is a recently proposed theory about Earthquakes where one triggers a series of other large earthquakes&mdashwithin the same Tectonic plate &mdashas Similar to aftershocks but on adjacent segments of fault, these storms occur over the course of years, and with some of the later earthquakes as damaging as the early ones. An aftershock is an Earthquake that occurs after a previous earthquake (the main shock Such a pattern was observed in the sequence of about a dozen earthquakes that struck the North Anatolian Fault in Turkey in the 20th century, the half dozen large earthquakes in New Madrid in 1811-1812, and has been inferred for older anomalous clusters of large earthquakes in the Middle East and in the Mojave Desert. The North Anatolian Fault (NAF ( Kuzey Anadolu Fay Hattı is a major active right lateral-moving Geologic fault in northern Anatolia which runs along the Tectonic New Madrid (nuːˈmædrɪd is a city in New Madrid County, Missouri, 42 miles (68 km south by west of Cairo Illinois, on the Mississippi River

Size and frequency of occurrence

Minor earthquakes occur nearly constantly around the world in places like California and Alaska in the U. California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Alaska ( Аляска Alyaska) is a state in the United States of America, in the northwest of the North American continent S. , as well as in Chile, Peru, Indonesia, Iran, Pakistan the Azores in Portugal, Turkey, New Zealand, Greece, Italy, and Japan,[4] Larger earthquakes occur less frequently, the relationship being exponential; for example, roughly ten times as many earthquakes larger than magnitude 4 occur in a particular time period than earthquakes larger than magnitude 5. Chile, officially the Republic of Chile ( Spanish:) is a country in South America occupying a long and narrow Coastal strip wedged between the Peru (Perú Piruw Piruw officially the Republic of Peru ( reˈpuβlika del peˈɾu is a country in western South America. The Republic of Indonesia ( (Republik Indonesia is a Country in Southeast Asia. For a topic outline on this subject see List of basic Iran topics. Pakistan () officially the Islamic Republic of Pakistan, is a country located in South Asia, Southwest Asia, Middle East and The Azores ( Açores ɐˈsoɾɨʃ or) is a Portuguese Archipelago in the Atlantic Ocean, about 1500 km (950  mi) from Portugal, officially the Portuguese Republic (República Portuguesa is a country on the Iberian Peninsula. Turkey (Türkiye known officially as the Republic of Turkey ( is a Eurasian Country that stretches New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island Greece (Ελλάδα transliterated: Elláda, historically, Ellás,) officially the Hellenic Republic (Ελληνική Δημοκρατία Italy (Italia officially the Italian Republic, (Repubblica Italiana is located on the Italian Peninsula in Southern Europe, and on the two largest For a topic outline on this subject see List of basic Japan topics. In Seismology, the Gutenberg–Richter law expresses the relationship between the magnitude and total number of Earthquakes in any given region and time In the (low seismicity) United Kingdom, for example, it has been calculated that the average recurrences are:

The number of seismic stations has increased from about 350 in 1931 to many thousands today. As a result, many more earthquakes are reported than in the past because of the vast improvement in instrumentation (not because the number of earthquakes has increased). The USGS estimates that, since 1900, there have been an average of 18 major earthquakes (magnitude 7. The United States Geological Survey ( USGS) is a scientific agency of the United States government. 0-7. 9) and one great earthquake (magnitude 8. 0 or greater) per year, and that this average has been relatively stable. [5] In fact, in recent years, the number of major earthquakes per year has actually decreased, although this is likely a statistical fluctuation. More detailed statistics on the size and frequency of earthquakes is available from the USGS. [6]

Most of the world's earthquakes (90%, and 81% of the largest) take place in the 40,000-km-long, horseshoe-shaped zone called the circum-Pacific seismic belt, also known as the Pacific Ring of Fire, which for the most part bounds the Pacific Plate. The Pacific Plate is an oceanic Tectonic plate beneath the Pacific Ocean. [7][8] Massive earthquakes tend to occur along other plate boundaries, too, such as along the Himalayan Mountains. Humans can cause earthquakes for example by constructing large dams and buildings, drilling and injecting liquid into wells, and by coal mining and oil drilling. A dam is a barrier that divides waters. Dams generally serve the primary purpose of retaining water while other structures such as Floodgates, Levees In Architecture, Construction, Engineering and real estate development the word building may refer to one of the following Any man-made Coal mining is the extraction or removal of Coal from the Earth by Mining. West Texas PumpjackJPG|thumb|right|300px|This Pumpjack located south of Midland TX is a common sight in West Texas. [9]

With the rapid growth of mega-cities such as Mexico City, Tokyo or Tehran, in areas of high seismic risk, some seismologists are warning that a single quake may claim the lives of up to 3 million people. A megacity is generally defined as a Metropolitan area with a total Population in excess of 10 million people Mexico City (in Spanish: Ciudad de México, México DF, México or simply Méjico) is the Capital city of Mexico officially, is one of the 47 prefectures of Japan and located on the eastern side of the main island Honshū. Tehran (or Teheran) ( Persian: تهران Tehrān) is the capital and largest City of Iran, and the administrative center of [10][11][12]

Effects/impacts of earthquakes

1755 copper engraving depicting Lisbon in ruins and in flames after the 1755 Lisbon earthquake. A tsunami overwhelms the ships in the harbor.
1755 copper engraving depicting Lisbon in ruins and in flames after the 1755 Lisbon earthquake. Lisbon (Lisboa liʒˈboɐ is the Capital and largest city of Portugal. The 1755 Lisbon earthquake, also known as the Great Lisbon Earthquake, took place on November 1 1755 at around 940 in the morning A tsunami overwhelms the ships in the harbor. A tsunami ((tsuːˈnɑːmi is a series of waves created when
Smoldering after the 1906 San Francisco earthquake.
Smoldering after the 1906 San Francisco earthquake.
Earthquake damage in Anchorage, Alaska (1964).
Earthquake damage in Anchorage, Alaska (1964). Alaska ( Аляска Alyaska) is a state in the United States of America, in the northwest of the North American continent
Earthquake damage in Mexico City (1985).
Earthquake damage in Mexico City (1985). Mexico City (in Spanish: Ciudad de México, México DF, México or simply Méjico) is the Capital city of Mexico
Earthquake damage in Armenia (1988).
Earthquake damage in Armenia (1988). Armenia (Հայաստան transliterated: Hayastan,) officially the Republic of Armenia (Հայաստանի Հանրապետություն Hayastani
A section of the Cypress viaduct collapsed during the Loma Prieta Earthquake (1989).
A section of the Cypress viaduct collapsed during the Loma Prieta Earthquake (1989). The Loma Prieta earthquake, also known as the Quake of '89 and the World Series Quake, was a major Earthquake that struck the San Francisco Bay
Kaiser Permanente Building destroyed in the Northridge Earthquake (1994).
Kaiser Permanente Building destroyed in the Northridge Earthquake (1994).
Damage in Great Hanshin earthquake (1995) in Kobe, Japan.
Damage in Great Hanshin earthquake (1995) in Kobe, Japan. The Great Hanshin Earthquake, or Kobe earthquake as it is more commonly known outside of Japan, was an Earthquake in Japan that occurred on Tuesday is the capital city of Hyōgo Prefecture and a prominent port city in Japan with a population of about 1
Chūetsu earthquake (2004).
Chūetsu earthquake (2004). The began at 556 pm on Saturday October 23, 2004 (0856 UT, same day


There are many effects of earthquakes including, but not limited to the following:

Shaking and ground rupture

Shaking and ground rupture are the main effects created by earthquakes, principally resulting in more or less severe damage to buildings or other rigid structures. The severity of the local effects depends on the complex combination of the earthquake magnitude, the distance from epicenter, and the local geological and geomorphological conditions, which may amplify or reduce wave propagation. The Richter magnitude scale, or more correctly local magnitude M L scale assigns a single number to quantify the amount of seismic energy released The epicenter or epicentre is the point on the Earth 's surface that is directly above the Hypocenter or focus the point where an Earthquake Wave propagation is any of the ways in which waves travel through a Waveguide. The ground-shaking is measured by ground acceleration.

Specific local geological, geomorphological, and geostructural features can induce high levels of shaking on the ground surface even from low-intensity earthquakes. This effect is called site or local amplification. It is principally due to the transfer of the seismic motion from hard deep soils to soft superficial soils and to effects of seismic energy focalization owing to typical geometrical setting of the deposits. Seismology (from Greek grc σεισμός seismos, "earthquake" and grc -λογία -logia) is the scientific study of Earthquakes

Ground rupture is a visible breaking and displacement of the earth's surface along the trace of the fault, which may be of the order of few metres in the case of major earthquakes. Ground rupture is a major risk for large engineering structures such as dams, bridges and nuclear power stations and requires careful mapping of existing faults to identify any likely to break the ground surface within the life of the structure. A dam is a barrier that divides waters. Dams generally serve the primary purpose of retaining water while other structures such as Floodgates, Levees Bridges is the plural form of Bridge. People Bridges is the Family name of Alicia Bridges, Nuclear power is any Nuclear technology designed to extract usable Energy from atomic nuclei via controlled Nuclear reactions

Landslides and avalanches

Earthquakes can cause landslides and avalanches, which may cause damage in hilly and mountainous areas. A landslide is a geological phenomenon which includes a wide range of ground movement such as rock falls deep failure of slopes and shallow debris flows which can occur This article refers to the natural event For other uses see Avalanche (disambiguation An avalanche is an abrupt and rapid flow of snow often

Fires

Following an earthquake, fires can be generated by break of the electrical power or gas lines. Fire is the heat and light energy released during a Chemical reaction, in particular a combustion reaction. Electric power is defined as the rate at which Electrical energy is transferred by an Electric circuit. In the event of water mains rupturing and a loss of pressure, it may also become difficult to stop the spread of a fire once it has started.

Soil liquefaction

Soil liquefaction occurs when, because of the shaking, water-saturated granular material temporarily loses its strength and transforms from a solid to a liquid. Soil liquefaction describes the behavior of loose saturated unconsolidated soils i See also Grain and Film grain Granularity is a measure of the size of the components or descriptions of components that make up A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. Liquid is one of the principal States of matter. A liquid is a Fluid that has the particles loose and can freely form a distinct surface at the boundaries of Soil liquefaction may cause rigid structures, as buildings or bridges, to tilt or sink into the liquefied deposits.

Tsunami

Undersea earthquakes and earthquake-triggered landslides into the sea, can cause Tsunami. A tsunami ((tsuːˈnɑːmi is a series of waves created when See, for example, the 2004 Indian Ocean earthquake. The 2004 Indian Ocean earthquake was an undersea Earthquake that occurred at 005853 UTC on December 26 2004 with an Epicentre off the west coast of

Floods

Floods may be a secondary effects of earthquakes, if dams are damaged.

Earthquakes may cause landslips to dam rivers, which then collapse and cause floods.

Human impacts

Earthquakes may result in disease, lack of basic necessities, loss of life, higher insurance premiums, general property damage, road and bridge damage, and collapse of buildings or destabilization of the base of buildings which may lead to collapse in future earthquakes. A disease is an abnormal condition of an organism that impairs bodily functions and can be deadly

The most significant human impact is loss of life

Preparation for earthquakes

Specific fault articles

Major earthquakes

Main article: List of earthquakes

Pre-20th century

20th century

21st century

Earthquakes in mythology and religion

In Norse mythology, earthquakes were explained as the violent struggling of the god Loki. Norse mythology comprises the indigenous pre-Christian religion, beliefs and Legends of the Scandinavian peoples including those who settled on Iceland In Cryptography, LOKI89 and LOKI91 are Block ciphers designed as possible replacements for the Data Encryption Standard (DES When Loki, god of mischief and strife, murdered Baldr, god of beauty and light, he was punished by being bound in a cave with a poisonous serpent placed above his head dripping venom. In Old Norse, áss (or ǫ́ss ás, plural æsir, feminine ásynja, feminine plural ásynjur) is the term denoting one of the principal Loki's wife Sigyn stood by him with a bowl to catch the poison, but whenever she had to empty the bowl the poison would drip on Loki's face, forcing him to jerk his head away and thrash against his bonds, causing the earth to tremble. Sigyn ( Old Norse "victorious girl-friend" is a goddess and wife of Loki in Norse mythology. [28]

In Greek mythology, Poseidon was the god of earthquakes. Greek mythology is the body of stories belonging to the ancient Greeks concerning their gods and Heroes the nature of the world and the origins and significance In Greek mythology, Poseidon ( Greek:; Latin: Neptūnus) was the god of the Sea and as "Earth-Shaker" [29]

See also

References

  1. ^ Spence, William; S. This article refers to the use of computers to estimate losses caused by disasters A cryoseism known as a frost quake may be caused by a sudden Cracking action in frozen soil or rock saturated with Water or Ice. Earthquake insurance is a form of property Insurance that pays the policyholder in the event of an Earthquake that causes damage to the property An earthquake light is an unusual luminous aerial phenomenon similar in appearance to the Aurora borealis, that Earthquake engineering is the study of the behavior of buildings and structures subject to Seismic loading. Earthquake weather is a type of weather popularly believed to precede Earthquakes From the ancient histories of Herodotus to the modern writings of David Lance Earthquake is a 1974 action adventure / disaster / Thriller film that achieved huge box-office success continuing the Disaster film The elastic rebound theory is an explanation for how energy is spread during earthquakes Geophysics, a major discipline of Earth sciences, is the study of the Earth by quantitative physical methods especially by seismic, electromagnetic A disaster is the impact of a natural or human-made hazard that negatively affects society or environment. An interplate earthquake is an Earthquake that occurs at the boundary between two Tectonic plates If one plate is trying to move past the other they will be locked An intraplate earthquake is an Earthquake that occurs in the interior of a Tectonic plate, whereas an Interplate earthquake is one that occurs at a plate The Japan Meteorological Agency seismic intensity scale is a measure used in Japan and Taiwan to indicate the strength of Earthquakes It is measured in units of. The following is a list of major Earthquakes. USGS list of significant earthquakes This is a list of significant earthquakes as listed by the The following list compiles known Earthquakes that have caused one or more Fatalities since 1900 For man-made disasters see List of wars and disasters by death toll A death toll is the number of dead as a result of War, Violence, This is a list of tectonic plates on Earth Tectonic plates are pieces of the Earth's crust and uppermost mantle together referred to as the Lithosphere A megathrust earthquake occurs at Subduction zones (destructive plate boundaries where one Tectonic plate is forced under (subducts another The meizoseismal area in an earthquake is the area of maximum damage The Mercalli intensity scale is a scale used for measuring the intensity of an Earthquake. A moonquake is the lunar equivalent of an Earthquake, ie a quake on the Moon. Plate tectonics (from Greek τέκτων tektōn "builder" or "mason" describes the large scale motions of Earth 's Lithosphere The Richter magnitude scale, or more correctly local magnitude M L scale assigns a single number to quantify the amount of seismic energy released A seismic scale is used to measure and compare the severity of Earthquakes (For a quick review see the table of seismic scales at the end of this article Seismic waves are Waves that travel through the Earth, most often as the result of a tectonic Earthquake, sometimes from an Explosion The Seismogenic Layer is the range of depths within the Crust or Lithosphere over which most Earthquakes are initiated Seismometers (from Greek Seism - "the shakes" - and Metro - "I measure" are instruments that measure and record motions of the ground including Seismology (from Greek grc σεισμός seismos, "earthquake" and grc -λογία -logia) is the scientific study of Earthquakes A mechanical or physical shock is a sudden Acceleration or deceleration caused for example by impact drop kick Earthquake, or Explosion. A submarine earthquake is an Earthquake which occurs underwater at the bed of the Sea. A tsunami ((tsuːˈnɑːmi is a series of waves created when The VAN method is an experimental method of Earthquake prediction, named after the surname initials of each of its inventors Greek Physicists Panayotis Varotsos A. Sipkin, G. L. Choy (1989). Measuring the Size of an Earthquake. United States Geological Survey. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved on 2006-11-03. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 644 - Umar ibn al-Khattab, the second Muslim Caliph, is killed by a Persian slave in Medina.
  2. ^ Talebian, M. Jackson, J. 2004. A reappraisal of earthquake focal mechanisms and active shortening in the Zagros mountains of Iran. Geophysical Journal International, 156, pages 506-526
  3. ^ Greene, H. W. ; Burnley, P. C. (26 October 1989). Events 740 - An Earthquake strikes Constantinople, causing much damage and death Year 1989 ( MCMLXXXIX) was a Common year starting on Sunday (link displays 1989 Gregorian calendar) "A new self-organizing mechanism for deep-focus earthquakes". Nature 341: 733-737. doi:10.1038/341733a0. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.  
  4. ^ but earthquakes can occur almost anywhere, including New York City, London, and Australia. The City of New York London ( ˈlʌndən is the capital and largest urban area in the United Kingdom. For a topic outline on this subject see List of basic Australia topics. Earthquake Hazards Program. USGS. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved on 2006-08-14. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures
  5. ^ Common Myths about Earthquakes. USGS. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved on 2006-08-14. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures
  6. ^ Earthquake Facts and Statistics: Are earthquakes increasing?. USGS. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved on 2006-08-14. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures
  7. ^ Historic Earthquakes and Earthquake Statistics: Where do earthquakes occur?. USGS. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved on 2006-08-14. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures
  8. ^ Visual Glossary - Ring of Fire. Retrieved on 2006-08-14. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures
  9. ^ Madrigal, Alexis. "Top 5 Ways to Cause a Man-Made Earthquake", Wired News, CondéNet, June 4, 2008. Events 781 BC - The first historic Solar eclipse is recorded in China. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Retrieved on 2008-06-05. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 70 - Titus and his Roman Legions breach the middle wall of Jerusalem in the Siege of Jerusalem  
  10. ^ Catastrophic earthquake
  11. ^ Global urban seismic risk
  12. ^ Earthquake safety in Iran and other developing countries
  13. ^ Earthquakes and Volcanic Eruptions
  14. ^ Earthquake Timeline - 1920
  15. ^ World's worst natural disasters since 1900
  16. ^ a b c Largest Earthquakes in the World Since 1900
  17. ^ Koffee News. (Avon, NJ: Koffee News, 2008)Vol 1, No. 41. p. 1.
  18. ^ Iran earthquake kills thousands
  19. ^ [1]
  20. ^ The Tale of the Tragedy of Neftegorsk
  21. ^ 1998: 4,000 feared dead in Afghan earthquake
  22. ^ El Comercio Peru.
  23. ^ Channelnewsasia.com
  24. ^ www. 4chan. org
  25. ^ cnn.com
  26. ^ cnn.com
  27. ^ Quake in Indonesia raises tsunami fears
  28. ^ Prose Edda by Snorri Sturluson
  29. ^ POSEIDON : Greek god of the sea & earthquakes ; mythology ; pictures : NEPTUNE

External links

Educational

Seismological data centers

Europe

Japan

United States

Seismic scales

Scientific information

Miscellaneous

Dictionary

earthquake

-noun

  1. A shaking of the Earth, caused by volcanic activity or movement around geologic faults.
  2. A natural disaster.
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