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Earthquake definition, 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. See more.


Earthquake: Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. Learn more about the causes and effects of earthquakes in this article.


Originally written by Lisa Wald for “The Green Frog News” Earthquakes are recorded by instruments called seismographs. The recording they make is called a seismogram. (figure 4) The seismograph has a base that sets firmly in the ground, and a heavy weight that hangs free. When an earthquake ...


Define earthquake. earthquake synonyms, earthquake pronunciation, earthquake translation, English dictionary definition of earthquake. n. A sudden movement of the earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity. ... (Geological Science) a sudden release of energy in the earth's crust or ...


Scientists don't really know if an earthquake is a foreshock until the bigger earthquake occurs. Seismic Waves Shock waves from an earthquake that travel through the ground are called seismic waves. They are most powerful at the center of the earthquake, but they travel through much of the earth and back to the surface.


What is an Earthquake? - Definition and Components. ... English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. ...


Earthquake prediction is a branch of the science of seismology concerned with the specification of the time, location, and magnitude of future earthquakes within stated limits. Many methods have been developed for predicting the time and place in which earthquakes will occur.


Epicenter of an earthquake Directly above the focus on the Earth's surface is the earthquake epicenter. Earthquake waves start at he focus and travel outward in all directions. Earthquake waves do not originate at the epicenter. News stories about earthquakes Most news stories on earthquakes will list the epicenter of an earthquake and then ...


magnitude. The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.Several scales have been defined, but the most commonly used are (1) local magnitude (ML), commonly referred to as "Richter magnitude", (2) surface-wave magnitude (Ms), (3) body-wave magnitude (Mb), and (4) moment .....


An earthquake is the result of a sudden release of stored energy in the Earth's crust that creates seismic waves. Earthquakes are accordingly measured with a seismometer, commonly known as a ...