According to USGS, “Alaska is the most earthquake-prone state and one of the most seismically active regions in the world. Alaska experiences a magnitude 7 earthquake almost every year, and a magnitude 8 or greater earthquake on average every 14 years.”
Earthquakes in California are due to the faults that run the length of the Pacific coast. These faults are a planar fracture in a volume of rock, across which there has been significant displacement. Energy release and rapid movement on these faults is the cause of most earthquakes. Some major historical earthquakes in California include: the sylmar earthquake, the loma prieta earthquake, and the northridge earthquake.
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