earthquake define
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earthquake A road broken by an earthquake. The definition of an earthquake is the release of sudden and extreme energy that is caused by shifting in the Earth's crust. Facts About Earthquakes. A seismometer is used to record and measure the strength of an earthquake. The Mercalli scale is used to measure the earthquake. Anything seven or above is considered extremely dangerous. Earthquakes usually occur along fault lines, or cracks that occur within the Earth’s crust.
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What does earthquake mean? At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity. In its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves.
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Earthquake An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth, which can be violent enough to destroy major buildings and kill thousands of people.The severity of the shaking can range from barely felt to violent enough to toss people around.t the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.
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- Earthquake—shaking or trembling of the earth that accompanies rock movements extending anywhere from the crust to 680 km below the Earth’s surface. It is the release of stored elastic energy caused by sudden fracture and movement of rocks
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earthquake earthquake definition: The definition of an earthquake is the release of sudden and extreme energy that is caused by shifting in the Earth's crust. Facts About Earthquakes A seismometer is used to record and measure the strength of an earthquake. ...
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Measuring Earthquakes The magnitude of an earthquake, usually expressed by the Richter Scale, is a measure of the amplitude of the seismic waves. The moment magnitude of an earthquake is a measure of the amount of energy released-an amount that can be estimated from seismograph readings.
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- Full Definition of TSUNAMI. : a great sea wave produced especially by submarine earth movement or volcanic eruption: tidal wave. — tsu·na·mic \-mik\ adjective.See tsunami defined for English-language learners.See tsunami defined for kids.ull Definition of TSUNAMI. : a great sea wave produced especially by submarine earth movement or volcanic eruption: tidal wave. — tsu·na·mic \-mik\ adjective. See tsunami defined for English-language learners. See tsunami defined for kids.
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Why Earthquakes Occur Main Content. An earthquake is ground shaking caused by a sudden movement of rock in the earth’s crust. Such movements occur along faults, which are thin zones of crushed rock separating blocks of crust.n earthquake is ground shaking caused by a sudden movement of rock in the earth’s crust. Such movements occur along faults, which are thin zones of crushed rock separating blocks of crust.
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The Science of Earthquakes An earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane. The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks. These are smaller earthquakes that happen in the same place as the larger earthquake that follows.
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- verb (used without object), quaked, quaking. 1. (of persons) to shake or tremble from cold, weakness, fear, anger, or the like: He spoke boldly even though his legs were quaking. 2. (of things) to shake or tremble, as from shock, internal convulsion, or instability: The earth suddenly began to quake.
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- Earthquake - shaking or trembling of the earth caused by movement along a fault. Erode - to wear away. Erosion - removal of rocks and dirt by wind, water and ice. Fault - a break or fracture in the crust of Earth. Geological - having to do with geology, the study of Earth. Deposition - the process of layering sediments. Glacier - slow-moving masses of snow and ice that carry rock and dirt.
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- An earthquake is a shaking of the Earth's crust. They strike without warning and vary greatly in severity. Earthquakes can be caused by: 1  underground volcanic forces.2  the breaking of rock under the Earth's surface. 3  a sudden movement along an existing fault line.n earthquake is a shaking of the Earth's crust. They strike without warning and vary greatly in severity. Earthquakes can be caused by: 1  underground volcanic forces.
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Earthquakes: Facts Earthquakes: Facts. When the surface of the earth moves in response to heat and pressure from below, the shaking is called an earthquake. Earthquakes are a very common occurrence. Once every 30 seconds somewhere in the world the ground shakes.
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seismic wave Contemporary definitions for seismic wave Expand. noun. an elastic shock wave that travels through the earth, as from an earthquake or explosion; also, one of four distinct waves generated by an earthquake.
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Earthquake An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes can be violent enough to toss people around and destroy whole cities.
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- Definition of seismic. 1  1 : of, subject to, or caused by an earthquake; also : of or relating to an earth vibration caused by something else (such as an explosion or the impact of a meteorite) 2  2 : of or relating to a vibration on a celestial body (such as the moon) comparable to a seismic event on earth.
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earthquake earthquake. 1  a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2  something that is severely disruptive; upheaval.
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- Definition of shake. 1 : an act of shaking: such asa : an act of shaking handsb : an act of shaking oneself. 2a : a blow or shock that upsets the equilibrium or disturbs the balance of somethingb : earthquake.
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Earthquake Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake’s point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter.arthquakes often occur in volcanic regions and are caused there, both by tectonic faults and the movement of magma in volcanoes. Such earthquakes can serve as an early warning of volcanic eruptions, as during the Mount St. Helens eruption of 1980.
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High School Earth Science/Nature of Earthquakes The earthquake happens when so much stress builds up in the rocks that the rocks rupture. An earthquake's energy is transmitted by seismic waves. Each year there are more than 150,000 earthquakes strong enough to be felt by people and 900,000 recorded by seismometers.
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Earthquakes When a force is applied to a body of a rock at plate boundaries, the rock may bend or break. Faults A break in the Earth's lithosphere where one block of rock moves toward, away from, or past another.
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What Causes Earthquakes: Information about Faults, Plate Tectonics and Earth Structure An earthquake is the ground shaking caused by a sudden slip on a fault. Stresses in the earth's outer layer push the sides of the fault together. Stress builds up and the rocks slip suddenly, releasing energy in waves that travel through the earth's crust and cause the shaking that we feel during an earthquake.
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tsunami (ts-nä'mē) A very large ocean wave that is caused by an underwater earthquake or volcanic eruption and often causes extreme destruction when it strikes land. Tsunamis can have heights of up to 30 m (98 ft) and reach speeds of 950 km (589 mi) per hour.
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Insurance 1 Earthquake insurance is a form of property insurance that pays the policyholder in the event of an earthquake that causes damage to the property. 2  Most ordinary home insurance policies do not cover earthquake damage. 3  Earthquake insurance policies generally feature a high deductible.