The San Jacino fault in Southern California is the second largest only to the San Andreas, the far better known one. It experiences as many as 4 mini earthquakes a day. However, scientists are now discovering that it is far less likely to have a major 6.9 or above earthquake event in the next 30 years than its neighboring fault. Scientists say that the small to moderate quakes that constantly occur on this fault force it to keep adjusting, which makes the liklihood of a major event not as great. However, there is still a 31% chance a great quake could occur here, which isn't much compared to the 57% chance at a large quake for the San Andreas fault. A magnitude 7.0 or greater would likely cause serious building damage and loss of life.
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