why do Earthquakes occur
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An earthquake is caused by a sudden slip on a fault. ... When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel. In California there are two plates - the Pacific Plate and the North American Plate.
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Why do Earthquakes occur?
- Earthquakes are caused by the movement of the Earth’s tectonic plates. Earthquakes occur where the earth’s plates meet along plate boundaries (see plate boundaries page for more information on this). For example, as two plates move towards each other, one can be pushed down under the other, into the mantle. If this plate gets stuck, it causes a lot of pressure on surrounding rocks. When this pressure is released, the stored energy is released producing shock waves like ripples on a pond. These are called seismic waves. When the energy reaches the surface of the Earth, they shake the ground and anything on it. This is an earthquake.
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