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Earthquakes are defined as a vibration of the earth's surface that occurs after a release of energy in the earth's crust. Because the earth's crust is made up of numerous segments or plates that are constantly moving slowly, vibrations can occur and result in small earthquakes.arthquakes are defined as a vibration of the earth's surface that occurs after a release of energy in the earth's crust. Because the earth's crust is made up of numerous segments or plates that are constantly moving slowly, vibrations can occur and result in small earthquakes.
The whole world is instrumented to the point the there are no earthquakes of any power that go unnoticed. Most earthquakes occur around the boundaries of the tectonic plates plates that form the outermost layer of the Earth. The plates move and slide over and under each other. Since they are huge, even tiny movements mean the release of vast amounts of energy for little creatures such as ourselves.