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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.


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.


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 ...


What is an Earthquake? - Definition and Components. ... "As a math/science tutor I find these lessons extremely helpful when introducing concepts to my students or reinforcing what they have been ...


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.


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 ...


Fun Facts All About Earthquakes for Kids. Alaska, California and Hawaii have the most earthquakes in the U.S. Other western states, like Nevada, Idaho, Washington and Oregon are prone to earthquakes or can be damaged by earthquakes that happen in Alaska and California.


Focus of an Earthquake, USGS. Focus of an earthquake The focus is also called the hypocenter of an earthquake. The vibrating waves travel away from the focus of the earthquake in all directions. The waves can be so powerful they will reach all parts of the Earth and cause it to vibrate like a turning fork.


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.


USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards