You will sure like this amazing Best HD Earthquake Compilation on Youtube.
In its most general sense, the word earthquake is used to describe any seismic event (whether natural or caused by humans)that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its hypocenter or focus. The epicenter is certainly the important point at ground level directly above the hypocenter.
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