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What is it?Earthquakes are a naturally destructive effect of our earth's constantly changing surface, and thousands of them happen every day. It refers to the sudden violent movement of the earth’s crust and often causes great destruction.

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What is it?Earthquakes are a naturally destructive effect of our earth's constantly changing surface, and thousands of them happen every day. It refers to the sudden violent movement of the earth’s crust and often causes great destruction.

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The 1944 San Juan earthquake took place in the province of San Juan, in the center-west area of Argentina, a region highly prone to seismic events. This moderate to strong earthquake (estimated moment magnitudes range from 6.7 to 7.8) destroyed a large part of San Juan, the provincial capital, and killed 10,000 of its inhabitants, 10% of its population at the time. One third of the province population became homeless. It is acknowledged as the worst natural disaster in Argentine history.

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Others Earthquakes in the World -Valdivia Earthquake (Chile) -Great Alaska Earthquake (Alaska) -Tohoku Earthquake (Japón)

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Others Earthquakes in the World -Valdivia Earthquake (Chile) -Great Alaska Earthquake (Alaska) -Tohoku Earthquake (Japón)

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Constructive Effects of earthquake:-Sometimes the earthquakes cause formation of hot springs which are very useful to people.-The earthquakes sometimes cause submergence in coastal land, and result in formation of inlets, bays and gulfs which help to develop of fishing and shipping etc.-Sometimes, the earthquakes cause emergence of costs and bring fertile shore out of water to give chance to develop crop production.

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Constructive Effects of earthquake:-Sometimes the earthquakes cause formation of hot springs which are very useful to people.-The earthquakes sometimes cause submergence in coastal land, and result in formation of inlets, bays and gulfs which help to develop of fishing and shipping etc.-Sometimes, the earthquakes cause emergence of costs and bring fertile shore out of water to give chance to develop crop production.

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Destructive Effects of earthquake:-Earthquake causes dismantling of buildings, bridge and other structures at or near epicenter. Many men and animals are killed or buried under collapsed houses.-Rails are folded, underground wires broken. Fire breaks out inevitably in large towns.-Earthquakes originate sea waves called Tsunamis.-Earthquakes result in the formation of cracks and fissures on the ground formation.-The earthquakes cause landslides and disturb the isostatic equilibrium.-Landslide due to earthquake may block valleys to form lakes.

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Destructive Effects of earthquake:-Earthquake causes dismantling of buildings, bridge and other structures at or near epicenter. Many men and animals are killed or buried under collapsed houses.-Rails are folded, underground wires broken. Fire breaks out inevitably in large towns.-Earthquakes originate sea waves called Tsunamis.-Earthquakes result in the formation of cracks and fissures on the ground formation.-The earthquakes cause landslides and disturb the isostatic equilibrium.-Landslide due to earthquake may block valleys to form lakes.

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Man-made Earthquakes:-The impounding of large quantities of water behind dams disturbs the crustal balance. This causes earthquakes such as the Koyna earthquake in Maharashtra.-The shock waves through rocks set up by the underground testing of Atom bombs or Hydrogen bombs may be severe to cause earthquake.

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Man-made Earthquakes:-The impounding of large quantities of water behind dams disturbs the crustal balance. This causes earthquakes such as the Koyna earthquake in Maharashtra.-The shock waves through rocks set up by the underground testing of Atom bombs or Hydrogen bombs may be severe to cause earthquake.

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26 December 2004 – Off the west coast of northern Sumatra
Magnitude 9.1

The deadliest tsunami in history was felt in 14 countries across Asia and east Africa, triggered by a "megathrust" as the Indian tectonic plate was forced beneath the Burmese plate. Indonesia was the worst affected with an estimated 170,000 of the nearly 230,000 dead. With many of the victims' bodies missing, the eventual death toll took a month to establish. Some the world's poorest communities lost more than 60% of their fishing and industrial infrastructure.

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Natural Causes of Earthquake:-Tectonic Movement: This particularly happens when the continental plate collides against the oceanic plate. The oceanic plate is overridden by the continental plate. By a process called subduction jerky movements are caused along the inclined surface. -Volcanic Activity: Earthquakes may also be caused by the movement of lava beneath the surface of the earth during volcanic activity. -Dislocation of the Earth’s crust: Earthquakes may be caused by the dislocation of the crust beneath the surface of the Earth.-Adjustment in inner Rock Beds: Earthquakes are also caused where is an adjustment between Sima and Sial in the interior of the Earth’s Crust. This Earthquake may be called as a Plutonic Earthquake.-Pressure of gases in the interior: The expansion and contraction of gases in the interior of the Earth sometimes cause a sudden shake on the Earth’s surface.-Other Causes:Landslides and avalanches,Denudation of the Landmasses and depositions of materials,Faulting and folding in the rock beds are responsible for causing minor earthquakes.

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Natural Causes of Earthquake:-Tectonic Movement: This particularly happens when the continental plate collides against the oceanic plate. The oceanic plate is overridden by the continental plate. By a process called subduction jerky movements are caused along the inclined surface. -Volcanic Activity: Earthquakes may also be caused by the movement of lava beneath the surface of the earth during volcanic activity. -Dislocation of the Earth’s crust: Earthquakes may be caused by the dislocation of the crust beneath the surface of the Earth.-Adjustment in inner Rock Beds: Earthquakes are also caused where is an adjustment between Sima and Sial in the interior of the Earth’s Crust. This Earthquake may be called as a Plutonic Earthquake.-Pressure of gases in the interior: The expansion and contraction of gases in the interior of the Earth sometimes cause a sudden shake on the Earth’s surface.-Other Causes:Landslides and avalanches,Denudation of the Landmasses and depositions of materials,Faulting and folding in the rock beds are responsible for causing minor earthquakes.