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Lecture20 - Earthquakes What is an earthquake An earthquake...

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Earthquakes
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¾ What is an earthquake? An earthquake is a vibration of the Earth produced by a rapid release of energy Energy released radiates in all directions from its source (focus or hypocenter) Energy is in the form of waves Sensitive instruments around the world record the event Epicenter is the position on the land surface directly above the focus Figure 11.2
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