Earthquakes occur when stress that has accumulated in the Earth's crust is suddenly released along fractures known as faults. These faults often form where massive tectonic plates move past one another but become stuck, allowing pressure to build for years or even centuries before a rupture occurs.
In Southern California, two of the region's most important fault systems are the San Andreas Fault and the San Jacinto Fault. Together, they accommodate most of the...

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