Why do earthquakes occur in California?

Answer

Earthquakes occur in California because the state of California lies on the San Andreas Fault line. The pacific plate on which California lays is constantly moving against the earths crust along the San Andreas Fault line causing the quakes.
Q&A Related to "Why do earthquakes occur in California?"
Earthquakes in California. It depends on where you are talking about. Along the San Andreas fault, a major earthquake occurs about every 100 years. Earthquakes are caused by plates
http://wiki.answers.com/Q/How_often_and_why_do_ear...
Earthquakes are linked to the natural movement of the Earth's crust. Volcanoes and tectonic plate activity can shift the placement of areas in the Earth's crust, resulting in an earthquake
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mostly tectonic plates.
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Tension and Neurological Causes The exact causes for headaches are unknown, though researchers have studied the possibility that they are caused by changes in chemicals in the brain
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1 Additional Answer
Earthquakes occur in California because California is located on the San Andreas fault which is about 800 miles long and forms the tectonic boundary between the Pacific Plate and the North American Plate. Thousands of earthquakes occur each year along the fault; only a few are ever felt by humans. You can find more information here: http://pubs.usgs.gov/gip/earthq3/contents.html
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