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Earthquakes - Major Causes of Earthquakes. Focus, Epicentre and seismic waves

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Introduction and Causes of Earthquakes * Earthquakes are sudden vibrations of the lithosphere. * Over 10 million earthquakes occur each year, but most of them are too mild to be felt. * They cause loss of lives and property. Major Causes of Earthquakes * Most earthquakes are the result of plate movements. ...read more.


* Some earthquakes are caused by volcanic eruptions. Focus, Epicentre and seismic waves * Some earthquakes are mild, some others are rather destructive. * The severity of an earthquake depends on the amount of energy that is released. * The point of origin of shock waves is usually at a certain depth in the earth's crust, known as focus. * The epicentre is the point on the Earth's surface vertically above the focus. ...read more.


By intensity * Felt by Human * Unfelt By Human * Felt earthquakes * Unfelt earthquakes 2. By causes * By natural force (Including earthquakes that are produced from plate movements and volcanic activities) * By Human activity (for example, from dams and explosion induced by people) * Natural earthquakes * Man-made earthquakes 3. By the depth of Focus * 0-70 km below the ground surface * 70-300 km below the ground surface * Over 300 km below the ground surface * Shallow Earthquakes * Medium Earthquakes * Deep Earthquakes 2 0 ...read more.

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