At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. When a large earthqaukes epicenter is based offshore then it may cause enough displacement to cause a "Tsunami"
In the generic term, the word "Earthquake" is used to describe any seismic event, whether its a natural occurence or created by humans, that generates seismic waves.
An Earthquake's center is called the "Focus" or "Hypocenter", and the point directly above this is called the Epicenter.
The main area of Earthquakes are at points where Earth's Plates meet.
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