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pinial

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earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.” Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust. (See the table of major earthquakes.)

earthquake epicentres

Global seismic centres for earthquakes of magnitude 5.5 and greater occurring between 1975 and 1999.(more)

Little was understood about earthquakes until the emergence of seismology at the beginning of the 20th century. Seismology, which involves the scientific study of all aspects of earthquakes, has yielded answers to such long-standing questions as why and how earthquakes occur.

San Francisco earthquake of 1906

Crowds watching the fires set off by the earthquake in San Francisco in 1906, photo by Arnold Genthe.(more)

About 50,000 earthquakes large enough to be noticed without the aid of instruments occur annually over the entire Earth. Of these, approximately 100 are of sufficient size to produce substantial damage if their centres are near areas of habitation. Very great earthquakes occur on average about once per year. Over the centuries they have been responsible for millions of deaths and an incalculable amount of damage to property.

The nature of earthquakes

Causes of earthquakes

Earth’s major earthquakes occur mainly in belts coinciding with the margins of tectonic plates. This has long been apparent from early catalogs of felt earthquakes and is even more readily discernible in modern seismicity maps, which show instrumentally determined epicentres. The most important earthquake belt is the Circum-Pacific Belt, which affects many populated coastal regions around the Pacific Ocean—for example, those of New Zealand, New Guinea, Japan, the Aleutian Islands, Alaska, and the western coasts of North and South America. It is estimated that 80 percent of the energy presently released in earthquakes comes from those whose epicentres are in this belt. The seismic activity is by no means uniform throughout the belt, and there are a number of branches at various points. Because at many places the Circum-Pacific Belt is associated with volcanic activity, it has been popularly dubbed the “Pacific Ring of Fire.”

Britannica Quiz

April Showers to March’s Lions and Lambs

A second belt, known as the Alpide Belt, passes through the Mediterranean region eastward through Asia and joins the Circum-Pacific Belt in the East Indies. The energy released in earthquakes from this belt is about 15 percent of the world total. There also are striking connected belts of seismic activity, mainly along oceanic ridges—including those in the Arctic Ocean, the Atlantic Ocean, and the western Indian Ocean—and along the rift valleys of East Africa. This global seismicity distribution is best understood in terms of its plate tectonic setting.

Natural forces

Earthquakes are caused by the sudden release of energy within some limited region of the rocks of the Earth. The energy can be released by elastic strain, gravity, chemical reactions, or even the motion of massive bodies. Of all these the release of elastic strain is the most important cause, because this form of energy is the only kind that can be stored in sufficient quantity in the Earth to produce major disturbances. Earthquakes associated with this type of energy release are called tectonic earthquakes.

Tectonics

Study the San Andreas Fault to see how horizontal movement displaces underlying rock and causes earthquakes

Earthquakes are caused by a sudden fracture of rock masses along a fault line.(more)

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summon skibidi toilet to save you

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LAVA

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big waves that are caused by earthquakes or volcanic eruptions that flood cities.

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big fat waves that drown humans

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You can hide from the disasters

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Natural Disasters are disasters that are caused by nature.

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skibidi alpha sigma rizz

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go inland for an a tsunami. Go to high, stable ground for an earthquake and RUN!!! for a volcanic eruption

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A natural events that occur due to the movement of the tectonic plates

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Big wave that crash on people

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People want heros to help them

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gigantic mountains filled with lava that eventually erupt and lava and magma spews out of them.

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the largest earthquake hapened in 1960, chile. it was a magnitude 9.5 eartquakes

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destruction of crops and economy

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Created by the tectonic plates grinding against each other, and the vibrations causes the land to move and shake.

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They shake the ground and is made by 3 different ways

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You can spot a tsunami when tides go back into the sea, and the level is lower

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caused by the movement of tectonic plates, and releases pressure which makes the ground shake.

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When the earth is mean and it attacks people

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Created by the pressure magma creates below tectonic plates.

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with earthquakes make sure you hide under anything or you will die

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Go to a land with no buildings with earthquakes

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Die

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A large wave that is caused by earthquakes or volcano eruptions

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Natural disasters are caused because of the moving of the landscape/landforms.

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People dying, homelessness and nature decline

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hide

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A mountain with lava and magma that explode out

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hot lava

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With tsunamis you go high

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have a shelter

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disasters caused by the enviroment that lead to destruction of areas

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loss of homes and infrastructure

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A big wave that can go far inland

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there are from magnitude 1 earthquakes to magnitude 10 earthqukes

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killing people

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Death.

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they can destory people's homes and kill people.

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run

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The shake the ground when tectonics plate go by each other. This is frequent in areas near the borders of tectonic plates.

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Huge mountains that can erupt tons of lava and magma

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they are very bad cause they kill alot of innocent people

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A big amount of water that flows past the highest sea level creating a large and deadly wave that can even swallow massive buildings in result of this natural disaster.

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They blow out lava and magma

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caused by the movement of the tectonic plates

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When two plates slide past each other, causing the ground to rapidly shake

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a big wave

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They are forces of nature that destroy human civilization