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Sagot :
It is true that typically, fewer than 20 major and great earthquakes each year account for more than 90 percent of energy released by the earthquakes.
What is an earthquake?
When energy is suddenly released from the Earth's lithosphere, seismic waves are produced, which causes the Earth's surface to shake. There are many different levels of earthquake strength, ranging from ones that are so little that no one can feel them to those that are powerful enough to launch people and items into the air, destroy vital infrastructure, and devastate entire cities. The number, variety, and size of earthquakes that occur in a given area over a given time period is known as its seismic activity. The seismicity is the average rate of seismic energy release per unit volume at a certain region on Earth. Tremors are seismic rumblings that don't cause an earthquake. Earthquakes cause ground to shake, shift, or otherwise be perturbed at the surface of the planet.
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