Earthquakes occur more frequently along fault lines. The tectonic plates are always slowly moving, but they get stuck at their edges, the fault line. When the stress on the edge overcomes the friction, there is an earthquake.
For example, in California there are two plates – the Pacific Plate and the North American Plate. The Pacific Plate consists of most of the Pacific Ocean floor and the California Coast line. The North American Plate comprises most the North American Continent and parts of the Atlantic Ocean floor. The primary boundary between these two plates is the San Andreas Fault. California experiences earthquakes frequently because of this fault line.
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